Explore topic-wise InterviewSolutions in .

They are classified into 3 classes by Sporne,

• Cycadospsida 
• Coniferopsida 
• Gnetopsida 

Hepaticopsida, Anthocerotopsida and Bryopsida. 

Cycadospsida, Coniferopsida and Gnetopsida.

• Presence of more than one embryo in ovule is called polyembryony. Eg: Pinus. 

• Manoxylic wood - Porous, So , more parenchyma with wide medullary ray. Eg: Cycas 
• Pycnoxylic wood - Compact with narrow medullary ray. Eg: Pinus 

Haplodiplontic life cycle is seen in bryophytes. 

(d) Angiospermae

Haplontic life cycle 

Diplontic life cycle 

Haplodiplontic life cycle

Cryptogams are non-flowering or non-seed producing plants. 

It has been divided into Algae, Bryophytes and Pteridophytes.

They are asexual spores which look similar to parent cell. Eg: Chlorella.

Correct option is (C) Cardinally

(c) a straight line

(b) adiabatic

(a) 1 mol wt. of NaCl = 58.5 g contains 6.022 × 10²³ 

(b) Contains molecules = 1000/58.5 × 6.023 × 10²³ = 102.96 × 10²³ molecules.

[1 mole of any substance contains 6.023 × 10²³ number of molecules [Avogadro’s number].

6.022 × 10²³ molecules occupied 22.42 cm³ (Its) = (22.4 x 6.023 x 10²²)/6.023 x 10²³ = 2.24 lits

Correct option: (C) 2.24 L

Volume occupied by 1 mole of any gas at STP

= 22.4 dm³

∴ Volume occupied by 4.4 g of CO₂ i.e., 0.1

mole of CO₂ at STP = 2.24 dm³ = 2.24 L

The light-sensitive cells are present in abundance in the Retina. 

There are two types of photoreceptor cells on the retina: 

(i) Rod cells or Rods Function: rods are responsible for night vision and respond to the intensity of light. 

(ii) Cone cells or Cones 

Function: cones respond to the colour of objects.

(i) Myopia is the defect of vision for which far point of an eye is less than infinity. It is also known as short-sightedness. The person is not able to see distant objects clearly (though he is able to see nearby objects clearly).

(ii) Hypermetropia is the defect of vision for which near point of eyes is more than 25 cm. It is also known as far sightedness. The person is not able to see nearby objects clearly (though he is able to see distant objects clearly).

1. Homeostasis is a property of a human biological system where the self – regulating process tends to maintain the balance for the survival. 

2. Behavioural and physiological responses are two important regulating mechanisms that maintain the stability of homeostasis. 

3. All the processes of integration and co – ordination of function are mediated by nervous and hormonal system. The liver, kidneys, and brain (hypothalamus), autonomic nervous system and the endocrine system help to maintain homeostasis.

i. d 

ii. c 

iii. a 

iv. b

Inhalation: 

• The muscles of the diaphragm contract. 
• The diaphragm goes downward. 
• The ribs move upwards and outwards.
• The volume of thoracic (chest) cavity increases. 
• Air enters the lungs through the nose.

Exhalation: 

• The muscles of the diaphragm relax. 
• The diaphragm goes upward. 
• The ribs move downwards. 
• The volume of thoracic (chest) cavity decreases. 
• Air goes out of the lungs through the nose.

The human eye can be compared to a camera as both functions by gathering, focusing, and transmitting the light through the lens for creating an image of an object.

1. The iris of the eye controls the size of the pupil depending on the amount of light entering it. 

2. The pupil is like the eyehole of a camera which allows light to come in. 

3. Lens : It is a transparent, biconvex, and an adjustable part of an eye, made up of protein. The lens with the help of the cornea refracts light focused on the retina, therefore creating images on it. 

4. The retina consists of photoreceptors and converts light rays into impulses to be sent to the brain. It is light sensitive. The retina is compared to the film in a camera.

i. b 

ii. a 

iii. d 

iv. c

1. Pickles are prepared usually by addition of excess salt. The salty solution creates a high concentration (hypertonic) in the external medium of the vegetable / fruit which is used for making pickles. 

2. Therefore water comes out of the vegatable and it undergoes plasmolysis and begins to shrink. 

3. Thus when water content is lost the pickle is able to retain its shelf life for a longer period.

(a) Higher concentration to a region of lower concentration

(c) Assertion is true but Reason is false

Diffusion is the movement of particles form an area of higher concentration to lower concentration. The overall effect is to equalize concentration throughout the medium. 

Example: Perfume filling a whole room.

1.(i) Choroid

2. (ii) Retina

3. (iii) Cornea

4. (iv) Iris

5. (ii) Ciliary muscles

Correct answer is (d) Pickling

The epithelial tissue is a tissue which acts as a covering and protects the underlying tissues. 

It is classified into the following types.

1. Squamous epithelium.

2. Cuboidal epithelium.

3. Columnar epithelium.

4. Ciliated epithelium .

5. Glandular epithelium.

(d) Both Assertion and Reason are false

Correct answer is (b) Cornea

It is a cell which is capable to becoming another more differentiated type of cell such as skin cell, nerve cell etc., in the body.

Complex tissue is made up of different types of cells but all the cells perform the same function.

Correct answer is (a) Bone

Connective :

(i) Areolar :

• Tendon
• LIgament

(ii) Adipose :

(iii) Skeletal :

• Bone
• Artilage

(iv) Fluid :

• Blood
• Lymph

Breathing refers to the physical process of inhalation and exhalation. Respiration is the process by which organisms breakdown glucose into a form that the cells can use as energy.

The external Structure of an Eye: 

The parts of the eye that are visible externally comprise of the external structure of the eye.

1. Sclera: It is a tough and thick white sheath that protects the inner parts of the eye. It is the ‘White of the eye’. 

2. Conjunctiva: It is a thin transparent membrane that is spread across the sclera. It keeps the eyes moist and clear by secreting small amounts of mucus and tears. 

3. Cornea: It is the transparent layer of membrane that is spread over the pupil and the iris. The main role of the cornea is to refract the light that enters the eyes.

4. Iris: It is a pigmented layer of tissues that make up the colored portion of the eye. Its primary function is to control the size of the pupil, depending on the amount of light entering it. 

5. Pupil: It is the small opening located at the middle of the Iris. It allows light to come in.

Correct option: (A) H₂ 

2H₂ + O₂ → 2H₂O

Ratio of mole of reactant, H₂ : O₂ = \(\cfrac{2}{1}\) = 2

Actual amount 3 g of H₂ and 29 g of O₂.

\(\cfrac{3}{2}\) = 1.5 mol of H₂ and \(\cfrac{29}{32}\) = 0.91 mol of O₂.

Ratio of actual moles of H₂ : O₂ = \(\cfrac{1.5}{0.91}\) = 1.66

Theoretical ratio of moles of H₂ : O₂ = 2 Actual ratio of moles of H₂ : O₂ = 1.66 Hence, H₂ is limiting reactant and O₂ is excess reactant.

(i), (iii)

(i) Good conductor of electricity

(iii) Solid, metallic

Correct answer is (a) Lactic acid

5th row means that n = 5

3rd group means that it is a d-block element.

It corresponds to atomic number 39.

(39 = 2, 8, 18, 9, 2)

Since the elements having atomic number 13 and 31 have 3 outermost electrons. So, these elements are placed in 3rd group due to which these elements have similar properties.

5th period of the periodic table corresponds to n = 5. It involves the filling of one 5s, five 4d and three 5p orbitals. The total number of orbitals available are 9. Hence, total 18 electrons can be accommodated in these orbitals. Therefore, 18 elements are present in 5th period.

101 unnilunium (unu) 

131 (utu) untriunium

The answer is (C) Freezing point