18288 + Interview Questions in Biology

1.	The position of cambium ring at the time of its origin in a dicot root is:
Answer» The position of cambium ring at the time of its origin in a dicot root is:

Discussion

2.	What characterisitc best describes the organisms listed below? Cat, toad, wall lizard, man, red algae
Answer» What characterisitc best describes the organisms listed below? Cat, toad, wall lizard, man, red algae

Discussion

3.	Those species whose numbers have been reduced considerably and are at the verge of extinction are called
Answer» Those species whose numbers have been reduced considerably and are at the verge of extinction are called

Discussion

4.	What are the categories of essential elements in mineral nutrition?
Answer» What are the categories of essential elements in mineral nutrition?

Discussion

5.	The bones common to face and cranium are?
Answer» The bones common to face and cranium are?

Discussion

6.	Vascular bundle in a dicot stem are
Answer» Vascular bundle in a dicot stem are

Discussion

7.	Testosterone stimulates:
Answer» Testosterone stimulates:

Discussion

8.	Which of the following represent glyptal?
Answer» Which of the following represent glyptal?

Discussion

9.	Identify the tissue system from among the following. (a) Parenchyma (b) Xylem (c) Epidermis (d) Phloem
Answer» Identify the tissue system from among the following. (a) Parenchyma (b) Xylem (c) Epidermis (d) Phloem

9.

Identify the tissue system from among the following. (a) Parenchyma (b) Xylem (c) Epidermis (d) Phloem

Answer»

Identify the tissue system from among the following.

(a) Parenchyma

(b) Xylem

(c) Epidermis

(d) Phloem

Discussion

10.	While eating peach or pear it is usually seen that some stone like structures get entangled in the teeth,
Answer» While eating peach or pear it is usually seen that some stone like structures get entangled in the teeth,

Discussion

11.	Study the following pedigree chart of a family starting with a mother with AB blood group and father with O blood group. Mention the blood and genotype of off spring numbered 1,2and 3.
Answer» Study the following pedigree chart of a family starting with a mother with AB blood group and father with O blood group. Mention the blood and genotype of off spring numbered 1,2and 3.

Discussion

12.	Question 22 It is said that the one cycle of cell division in human cells (eukaryotic cells) takes 24 hours. Which phase of the cycle, do you think occupies the maximum part of cell cycle?
Answer» Question 22 It is said that the one cycle of cell division in human cells (eukaryotic cells) takes 24 hours. Which phase of the cycle, do you think occupies the maximum part of cell cycle?

Discussion

13.	Which among these has helped the angiosperms to become the most dominant form of plant?
Answer» Which among these has helped the angiosperms to become the most dominant form of plant?

Discussion

14.	Identify the labelled parts in the given cross section of female breast.
Answer» Identify the labelled parts in the given cross section of female breast.

14.

Identify the labelled parts in the given cross section of female breast.

Answer»

Identify the labelled parts in the given cross section of female breast.

Discussion

15.	Stomatal opening and closing involves various ions. Identify the ions - P, Q, R and S.
Answer» Stomatal opening and closing involves various ions. Identify the ions - P, Q, R and S.

Discussion

16.	How does the progeny formed from asexual reproduction differ from those formed by sexual reproduction?
Answer» How does the progeny formed from asexual reproduction differ from those formed by sexual reproduction?

Discussion

17.	Which of the following is a method of birth control?
Answer» Which of the following is a method of birth control?

Discussion

18.	In an amino acid, the carboxyl group ionizes at pKa1=2.34 and ammonium ion at pKa2=9.6. The isoelectric point of the amino acid is at pH.
Answer» In an amino acid, the carboxyl group ionizes at $p K a_{1} = 2.34$ and ammonium ion at $p K a_{2} = 9.6$ . The isoelectric point of the amino acid is at pH.

Discussion

19.	When RNA is stable enough to be the genetic material for few viruses why can't it be for other organisms?
Answer» When RNA is stable enough to be the genetic material for few viruses why can't it be for other organisms?

Discussion

20.	If CO2 released is equal to the amount of O2 absorbed the respiratory substrate is _____.
Answer» If $C O_{2}$ released is equal to the amount of $O_{2}$ absorbed the respiratory substrate is _____.

Discussion

21.	Which of the following will not possibly lead to a pregnancy?
Answer» Which of the following will not possibly lead to a pregnancy?

Discussion

22.	Which one of the following is considered as common ancestor of old world monkeys, apes and man?
Answer» Which one of the following is considered as common ancestor of old world monkeys, apes and man?

Discussion

23.	Which type of cancer affects lymph nodes and spleen?
Answer» Which type of cancer affects lymph nodes and spleen?

Discussion

24.	Antibodies are produced by:
Answer» Antibodies are produced by:

Discussion

25.	Question 1 Fill in the gaps in the following table illustrating differences between prokaryotic and eukaryotic cells. Prokaryotic cell Eukaryotic cell1.Size: generally small(1−10μm)1 μm==10−6m1.Size: generally large(5−100μm)2.Nuclear region:–––––––––––––––––––– and is known as ––––––––––2.Nuclear region: well-defined and surrounded by a nuclear membrane3.Chromosome:single3.More than one chromosome4.Membrane-bound cell organelles are absent4.––––––––––––––––––––
Answer» Question 1 Fill in the gaps in the following table illustrating differences between prokaryotic and eukaryotic cells. $\begin{matrix} P r o k a r y o t i c c e l l & E u k a r y o t i c c e l l 1. & Size: generally small (1 - 10 μ m) 1 μ m == 10^{- 6} m & 1. & Size: generally large (5 - 100 μ m) 2. & N u c l e a r r e g i o n : - ------------------ - a n d i s k n o w n a s - -------- - & 2. & Nuclear region: well-defined and surrounded by a nuclear membrane 3. & Chromosome:single & 3. & More than one chromosome 4. & Membrane-bound cell organelles are absent & 4. & - ------------------ - \end{matrix}$

Discussion

26.	Cultivation of a single crop on a given tract of land leads eventually to decreased yields. One reason for this is that harmful bacterial phytopathogens, organisms parasitic on plant hosts, increase in the soil surrounding plant roots. The problem can be cured by crop rotation, denying the pathogens a suitable host for a period of time. However, even if crops are not rotated, the severity of diseases brought on by such phytopathogens often decreases after a number of years as the microbial population of the soil changes and the soil becomes “suppressive” to those diseases. While there may be many reasons for this phenomenon, it is clear that levels of certain bacteria, such as Pseudomonas fluorescens, a bacterium antagonistic to a number of harmful phytopathogens, are greater in suppressive than in nonsuppressive soil. This suggests that the presence of such bacteria suppresses phytopathogens. There is now considerable experimental support for this view. Wheat yield increases of 27 percent have been obtained in field trials by treatment of wheat seeds with fluorescent pseudomonads. Similar treatment of sugar beets, cotton, and potatoes has had similar results. These improvements in crop yields through the application of Pseudomonas fluorescenssuggest that agriculture could benefit from the use of bacteria genetically altered for specific purposes. For example, a form of phytopathogen altered to remove its harmful properties could be released into the environment in quantities favorable to its competing with and eventually excluding the harmful normal strain. Some experiments suggest that deliberately releasing altered nonpathogenic Pseudomonas syringae could crowd out (crowd out: the nonaltered variety that causes frost damage. Opponents of such research have objected that the deliberate and large-scale release of genetically altered bacteria might have deleterious results. Proponents, on the other hand, argue that this particular strain is altered only by the removal of the gene responsible for the strain’s propensity to cause frost damage, thereby rendering it safer than the phytopathogen from which it was derived. Some proponents have gone further and suggest that genetic alteration techniques could create organisms with totally new combinations of desirable traits not found in nature. For example, genes responsible for production of insecticidal compounds have been transposed from other bacteria into pseudomonads that colonize corn roots. Experiments of this kind are difficult and require great care: such bacteria are developed in highly artificial environments and may not compete well with natural soil bacteria. Nevertheless, proponents contend that the prospects for improved agriculture through such methods seem excellent. These prospects lead many to hope that current efforts to assess the risks of deliberate release of altered microorganisms will successfully answer the concerns of opponents and create a climate in which such research can go forward without undue impediment. Q27. The author discusses naturally occurring Pseudomonas fluorescens bacteria in the first paragraph primarily in order to do which one of the following?
Answer» Cultivation of a single crop on a given tract of land leads eventually to decreased yields. One reason for this is that harmful bacterial phytopathogens, organisms parasitic on plant hosts, increase in the soil surrounding plant roots. The problem can be cured by crop rotation, denying the pathogens a suitable host for a period of time. However, even if crops are not rotated, the severity of diseases brought on by such phytopathogens often decreases after a number of years as the microbial population of the soil changes and the soil becomes “suppressive” to those diseases. While there may be many reasons for this phenomenon, it is clear that levels of certain bacteria, such as Pseudomonas fluorescens, a bacterium antagonistic to a number of harmful phytopathogens, are greater in suppressive than in nonsuppressive soil. This suggests that the presence of such bacteria suppresses phytopathogens. There is now considerable experimental support for this view. Wheat yield increases of 27 percent have been obtained in field trials by treatment of wheat seeds with fluorescent pseudomonads. Similar treatment of sugar beets, cotton, and potatoes has had similar results. These improvements in crop yields through the application of Pseudomonas fluorescenssuggest that agriculture could benefit from the use of bacteria genetically altered for specific purposes. For example, a form of phytopathogen altered to remove its harmful properties could be released into the environment in quantities favorable to its competing with and eventually excluding the harmful normal strain. Some experiments suggest that deliberately releasing altered nonpathogenic Pseudomonas syringae could crowd out (crowd out: the nonaltered variety that causes frost damage. Opponents of such research have objected that the deliberate and large-scale release of genetically altered bacteria might have deleterious results. Proponents, on the other hand, argue that this particular strain is altered only by the removal of the gene responsible for the strain’s propensity to cause frost damage, thereby rendering it safer than the phytopathogen from which it was derived. Some proponents have gone further and suggest that genetic alteration techniques could create organisms with totally new combinations of desirable traits not found in nature. For example, genes responsible for production of insecticidal compounds have been transposed from other bacteria into pseudomonads that colonize corn roots. Experiments of this kind are difficult and require great care: such bacteria are developed in highly artificial environments and may not compete well with natural soil bacteria. Nevertheless, proponents contend that the prospects for improved agriculture through such methods seem excellent. These prospects lead many to hope that current efforts to assess the risks of deliberate release of altered microorganisms will successfully answer the concerns of opponents and create a climate in which such research can go forward without undue impediment. Q27. The author discusses naturally occurring Pseudomonas fluorescens bacteria in the first paragraph primarily in order to do which one of the following?

26.

Cultivation of a single crop on a given tract of land leads eventually to decreased yields. One reason for this is that harmful bacterial phytopathogens, organisms parasitic on plant hosts, increase in the soil surrounding plant roots. The problem can be cured by crop rotation, denying the pathogens a suitable host for a period of time. However, even if crops are not rotated, the severity of diseases brought on by such phytopathogens often decreases after a number of years as the microbial population of the soil changes and the soil becomes “suppressive” to those diseases. While there may be many reasons for this phenomenon, it is clear that levels of certain bacteria, such as Pseudomonas fluorescens, a bacterium antagonistic to a number of harmful phytopathogens, are greater in suppressive than in nonsuppressive soil. This suggests that the presence of such bacteria suppresses phytopathogens. There is now considerable experimental support for this view. Wheat yield increases of 27 percent have been obtained in field trials by treatment of wheat seeds with fluorescent pseudomonads. Similar treatment of sugar beets, cotton, and potatoes has had similar results. These improvements in crop yields through the application of Pseudomonas fluorescenssuggest that agriculture could benefit from the use of bacteria genetically altered for specific purposes. For example, a form of phytopathogen altered to remove its harmful properties could be released into the environment in quantities favorable to its competing with and eventually excluding the harmful normal strain. Some experiments suggest that deliberately releasing altered nonpathogenic Pseudomonas syringae could crowd out (crowd out: the nonaltered variety that causes frost damage. Opponents of such research have objected that the deliberate and large-scale release of genetically altered bacteria might have deleterious results. Proponents, on the other hand, argue that this particular strain is altered only by the removal of the gene responsible for the strain’s propensity to cause frost damage, thereby rendering it safer than the phytopathogen from which it was derived. Some proponents have gone further and suggest that genetic alteration techniques could create organisms with totally new combinations of desirable traits not found in nature. For example, genes responsible for production of insecticidal compounds have been transposed from other bacteria into pseudomonads that colonize corn roots. Experiments of this kind are difficult and require great care: such bacteria are developed in highly artificial environments and may not compete well with natural soil bacteria. Nevertheless, proponents contend that the prospects for improved agriculture through such methods seem excellent. These prospects lead many to hope that current efforts to assess the risks of deliberate release of altered microorganisms will successfully answer the concerns of opponents and create a climate in which such research can go forward without undue impediment. Q27. The author discusses naturally occurring Pseudomonas fluorescens bacteria in the first paragraph primarily in order to do which one of the following?

Answer»

Cultivation of a single crop on a given tract of land leads eventually to decreased yields. One reason for this is that harmful bacterial phytopathogens, organisms parasitic on plant hosts, increase in the soil surrounding plant roots. The problem can be cured by crop rotation, denying the pathogens a suitable host for a period of time. However, even if crops are not rotated, the severity of diseases brought on by such phytopathogens often decreases after a number of years as the microbial population of the soil changes and the soil becomes “suppressive” to those diseases. While there may be many reasons for this phenomenon, it is clear that levels of certain bacteria, such as Pseudomonas fluorescens, a bacterium antagonistic to a number of harmful phytopathogens, are greater in suppressive than in nonsuppressive soil. This suggests that the presence of such bacteria suppresses phytopathogens. There is now considerable experimental support for this view. Wheat yield increases of 27 percent have been obtained in field trials by treatment of wheat seeds with fluorescent pseudomonads. Similar treatment of sugar beets, cotton, and potatoes has had similar results.

These improvements in crop yields through the application of Pseudomonas fluorescenssuggest that agriculture could benefit from the use of bacteria genetically altered for specific purposes. For example, a form of phytopathogen altered to remove its harmful properties could be released into the environment in quantities favorable to its competing with and eventually excluding the harmful normal strain. Some experiments suggest that deliberately releasing altered nonpathogenic Pseudomonas syringae could crowd out (crowd out: the nonaltered variety that causes frost damage. Opponents of such research have objected that the deliberate and large-scale release of genetically altered bacteria might have deleterious results. Proponents, on the other hand, argue that this particular strain is altered only by the removal of the gene responsible for the strain’s propensity to cause frost damage, thereby rendering it safer than the phytopathogen from which it was derived.

Some proponents have gone further and suggest that genetic alteration techniques could create organisms with totally new combinations of desirable traits not found in nature. For example, genes responsible for production of insecticidal compounds have been transposed from other bacteria into pseudomonads that colonize corn roots. Experiments of this kind are difficult and require great care: such bacteria are developed in highly artificial environments and may not compete well with natural soil bacteria. Nevertheless, proponents contend that the prospects for improved agriculture through such methods seem excellent. These prospects lead many to hope that current efforts to assess the risks of deliberate release of altered microorganisms will successfully answer the concerns of opponents and create a climate in which such research can go forward without undue impediment.

Q27. The author discusses naturally occurring Pseudomonas fluorescens bacteria in the first paragraph primarily in order to do which one of the following?

Discussion

27.	A leaf cell of a water plant was placed in a liquid other than pond water. After some time, it assumed a shape as shown below: (a) Give the term fro the state of the cell it has acquired. (b) Comment on nature (tonicity) of the liquid surrounding the cell. (c) Redraw in the space provided, the diagram of the cell if it is soon placed in ordinary water for some time.
Answer» A leaf cell of a water plant was placed in a liquid other than pond water. After some time, it assumed a shape as shown below: (a) Give the term fro the state of the cell it has acquired. (b) Comment on nature (tonicity) of the liquid surrounding the cell. (c) Redraw in the space provided, the diagram of the cell if it is soon placed in ordinary water for some time.

27.

A leaf cell of a water plant was placed in a liquid other than pond water. After some time, it assumed a shape as shown below: (a) Give the term fro the state of the cell it has acquired. (b) Comment on nature (tonicity) of the liquid surrounding the cell. (c) Redraw in the space provided, the diagram of the cell if it is soon placed in ordinary water for some time.

Answer»

A leaf cell of a water plant was placed in a liquid other than pond water. After some time, it assumed a shape as shown below:

(a) Give the term fro the state of the cell it has acquired.

(b) Comment on nature (tonicity) of the liquid surrounding the cell.

(c) Redraw in the space provided, the diagram of the cell if it is soon placed in ordinary water for some time.

Discussion

28.	(a) Why are the plants raised through micropropagation termed as somaclones? (b) Mention two advantages of this technique. [2]
Answer» (a) Why are the plants raised through micropropagation termed as somaclones? (b) Mention two advantages of this technique. [2]

Discussion

29.	Drosophila melanogaster (fruit fly, banana fly) was first used by Morgan and now widely used in genetics. It is called
Answer» Drosophila melanogaster (fruit fly, banana fly) was first used by Morgan and now widely used in genetics. It is called

Discussion

30.	Fill in the blanks with correct words (i)____ is the unit of bone made of cells called (ii)________which are connected by(iii) _________ canals with each other to make a network to form a compact bone.
Answer» Fill in the blanks with correct words (i)____ is the unit of bone made of cells called (ii)________which are connected by(iii) _________ canals with each other to make a network to form a compact bone.

30.

Fill in the blanks with correct words (i) is the unit of bone made of cells called (ii)which are connected by(iii) _____ canals with each other to make a network to form a compact bone.

Answer»

Fill in the blanks with correct words

(i)____ is the unit of bone made of cells called (ii)________which are connected by(iii) _________ canals with each other to make a network to form a compact bone.

Discussion

31.	How many molecules of ATP and NADP are required in formation of two molecules of glucose? How many Calvin cycles are required?
Answer» How many molecules of ATP and NADP are required in formation of two molecules of glucose? How many Calvin cycles are required?

Discussion

32.	The sugarcane variety produced through cross between Saccharum officinarum and Saccharum barberi exhibits characters such as
Answer» The sugarcane variety produced through cross between Saccharum officinarum and Saccharum barberi exhibits characters such as

Discussion

33.	Which one of the following does not involve isomerisation in glycolysis pathway?
Answer» Which one of the following does not involve isomerisation in glycolysis pathway?

Discussion

34.	The mouthparts of cockroaches are of which of the following types?
Answer» The mouthparts of cockroaches are of which of the following types?

Discussion

35.	The smaller glial cells that forms the first line of defense and immunity of nerve cells are called as _____.
Answer» The smaller glial cells that forms the first line of defense and immunity of nerve cells are called as _____.

Discussion

36.	Sugarcane plant has
Answer» Sugarcane plant has

Discussion

37.	Which of the following is the correct method of writing the scientific name of humans?
Answer» Which of the following is the correct method of writing the scientific name of humans?

Discussion

38.	Alleles are:
Answer» Alleles are:

Discussion

39.	Prepare a list of some animals that are found parasitic on human beings.
Answer» Prepare a list of some animals that are found parasitic on human beings.

Discussion

40.	Fat is stored in
Answer» Fat is stored in

Discussion

41.	If a person’s RBC is not coated with specific glycoprotein then the blood group is
Answer» If a person’s RBC is not coated with specific glycoprotein then the blood group is

Discussion

42.	Can there be mitosis without DNA replication in S phase?
Answer» Can there be mitosis without DNA replication in S phase?

Discussion

43.	Which of the following is correct:(a) Cells of all living organisms have a nucleus.(b) Both animal and plant cells have a well-defined cell wall.(c) In prokaryotes, there are no membrane-bound organelles.(d) Cells are formed de novo from abiotic materials.
Answer» Which of the following is correct: (a) Cells of all living organisms have a nucleus. (b) Both animal and plant cells have a well-defined cell wall. (c) In prokaryotes, there are no membrane-bound organelles. (d) Cells are formed de novo from abiotic materials.

43.

Which of the following is correct:(a) Cells of all living organisms have a nucleus.(b) Both animal and plant cells have a well-defined cell wall.(c) In prokaryotes, there are no membrane-bound organelles.(d) Cells are formed de novo from abiotic materials.

Answer»

Which of the following is correct:

(a) Cells of all living organisms have a nucleus.

(b) Both animal and plant cells have a well-defined cell wall.

(c) In prokaryotes, there are no membrane-bound organelles.

(d) Cells are formed de novo from abiotic materials.

Discussion

44.	Autecology is the:
Answer» Autecology is the:

Discussion

45.	What are the main steps in aerobic respiration? Where does it take place?
Answer» What are the main steps in aerobic respiration? Where does it take place?

Discussion

46.	Describe various types of epithelial tissues with the help of labelled diagrams.
Answer» Describe various types of epithelial tissues with the help of labelled diagrams.

Discussion

47.	Self-fertilization in earthworm is prevented due to
Answer» Self-fertilization in earthworm is prevented due to

Discussion

48.	ABO blood groups in humans are controlled by the gene l. It has three alleles-l A, l B and i. Since there are three different alleles, six different genotypes are possible. How many phenotypes can occur?
Answer» ABO blood groups in humans are controlled by the gene l. It has three alleles-l A, l B and i. Since there are three different alleles, six different genotypes are possible. How many phenotypes can occur?

Discussion

49.	Embryogenesis involves
Answer» Embryogenesis involves

Discussion

50.	In a ring girdled plant:
Answer» In a ring girdled plant:

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The position of cambium ring at the time of its origin in a dicot root is:

What characterisitc best describes the organisms listed below? Cat, toad, wall lizard, man, red algae

Those species whose numbers have been reduced considerably and are at the verge of extinction are called

What are the categories of essential elements in mineral nutrition?

The bones common to face and cranium are?

Vascular bundle in a dicot stem are

Testosterone stimulates:

Which of the following represent glyptal?

Identify the tissue system from among the following. (a) Parenchyma (b) Xylem (c) Epidermis (d) Phloem

While eating peach or pear it is usually seen that some stone like structures get entangled in the teeth,

Study the following pedigree chart of a family starting with a mother with AB blood group and father with O blood group. Mention the blood and genotype of off spring numbered 1,2and 3.

Question 22 It is said that the one cycle of cell division in human cells (eukaryotic cells) takes 24 hours. Which phase of the cycle, do you think occupies the maximum part of cell cycle?

Which among these has helped the angiosperms to become the most dominant form of plant?

Identify the labelled parts in the given cross section of female breast.

Stomatal opening and closing involves various ions. Identify the ions - P, Q, R and S.

How does the progeny formed from asexual reproduction differ from those formed by sexual reproduction?

Which of the following is a method of birth control?

In an amino acid, the carboxyl group ionizes at pKa1=2.34 and ammonium ion at pKa2=9.6. The isoelectric point of the amino acid is at pH.

When RNA is stable enough to be the genetic material for few viruses why can't it be for other organisms?

If CO2 released is equal to the amount of O2 absorbed the respiratory substrate is _____.

Which of the following will not possibly lead to a pregnancy?

Which one of the following is considered as common ancestor of old world monkeys, apes and man?

Which type of cancer affects lymph nodes and spleen?

Antibodies are produced by:

(a) Why are the plants raised through micropropagation termed as somaclones? (b) Mention two advantages of this technique. [2]

Drosophila melanogaster (fruit fly, banana fly) was first used by Morgan and now widely used in genetics. It is called

Fill in the blanks with correct words (i)____ is the unit of bone made of cells called (ii)________which are connected by(iii) _________ canals with each other to make a network to form a compact bone.

How many molecules of ATP and NADP are required in formation of two molecules of glucose? How many Calvin cycles are required?

The sugarcane variety produced through cross between Saccharum officinarum and Saccharum barberi exhibits characters such as

Which one of the following does not involve isomerisation in glycolysis pathway?

The mouthparts of cockroaches are of which of the following types?

The smaller glial cells that forms the first line of defense and immunity of nerve cells are called as _____.

Sugarcane plant has

Which of the following is the correct method of writing the scientific name of humans?

Alleles are:

Prepare a list of some animals that are found parasitic on human beings.

Fat is stored in

If a person’s RBC is not coated with specific glycoprotein then the blood group is

Can there be mitosis without DNA replication in S phase?

Which of the following is correct:(a) Cells of all living organisms have a nucleus.(b) Both animal and plant cells have a well-defined cell wall.(c) In prokaryotes, there are no membrane-bound organelles.(d) Cells are formed de novo from abiotic materials.

Autecology is the:

What are the main steps in aerobic respiration? Where does it take place?

Describe various types of epithelial tissues with the help of labelled diagrams.

Self-fertilization in earthworm is prevented due to

ABO blood groups in humans are controlled by the gene l. It has three alleles-l A, l B and i. Since there are three different alleles, six different genotypes are possible. How many phenotypes can occur?

Embryogenesis involves

In a ring girdled plant:

Fill in the blanks with correct words (i) is the unit of bone made of cells called (ii)which are connected by(iii) _____ canals with each other to make a network to form a compact bone.