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Opening to the trachea is covered by a small flap of tissue termed as the ______.

Fifty percent of the lymphoid tissue in human body.

Which of the following is mismatched?

Fusion of two motile gametes which are dissimilar in size is termed as

(a) Oogamy (b) isogamy (c) Anisogamy (d) zoogamy

Heterospory, i.e., formation of two types of spores --- microspores and megaspores is a characteristic feature in the life cycle of a few members of pteridophytes and all spermatophytes. Do you think heterospory has some evolutionary significance in plant kingdom?

The complete name of a plant in binomial system has

Explain the structure of the middle and internal ear with the help of a diagram.

The chemical name of vitamin C is

[J & K 2005]

Callose covering is present over

Tube feet is the locomotory organ in:

Spore dissemination in some liverworts is aided by:

The last of terminal cytochrome in respiratory chain is

In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct answer out of the following choices.
(a) Assertion and reason both are correct statements and reason explains the assertion.
(b) Both assertion and reason are wrong statements.
(c) Assertion is correct statement and reason is wrong statement.
(d) Assertion is wrong statement and reason is correct statement.
(e) Assertion and reason both are correct statements but reason does not explain assertion.
Assertion (A) Glycine must be taken through diet.
Reason (R) It is an essential amino acid.

The correct statement regarding RNA and DNA, respectively is

What fraction of the assimilated energy is used in respiration by the herbivores?

Athletes are often trained at high altitude because:

Which STD is responsible for burning micturition, along with purulent discharge from the genitals, and painful external genitalia?

Is thigmotropism in touch me not plant positive or negative?

__ is a disease of the lungs where there is inflammation of the pleurae.

Mendel conducted experiments on ___.

In hydrophyte stomata is absent so how does gaseous exchange takes place?????

Lipid molecules of plasma membrane occur:

Which of the following is formed in Stanley Miller's classic experiment?

During muscle contraction, which of the following events occur?

(a) H-zone disappears
(b) A-band widens
(c) I-band reduces in width
(d) Width of A-band in unaffected
(e) M line and Z line come closer

Inner layer of pericarp is hard and stony in

To initiate translation, the mRNA first binds to

Q5. Consider the following statements about North Atlantic right whale:

1. Climate change poses a threat to the North Atlantic right whale.

2. Right whales have such a long reproduction and migratory cycle that the population was greatly affected by the minimal food availability.

Which of the above statements are correct?

I am a triploblastic invertebrate with a hard exoskeleton. I have an asymmetrical body plan, but many of my cousins are bilaterally symmetrical. I belong to the phylum

At the base of skull, a large hole is present which allows brain to continue with the spinal cord. That hole is called :

A period immediately following stimulation during which a nerve or muscle is unresponsive to further stimulation.

[CBSE PMT 2004]

In phylogenetic evolution which of the following option is relative of human's?

Which of the following statements regarding hormonal control of the menstrual cycle is not correct?

In telophase, which of the following structures are recognized?

Density of population D is

Write the difference between :

(a) Blood and Lymph

(b) Open and Closed system of circulation

(c) Systole and Diastole

(d) P-wave and T-wave

Why is that in certain plants deficiency symptoms appear first in younger parts of the plant while in others they do so in mature organs?

3. What different criteria would you choose to classify people that you meet often?

Figure shows a capillary tube C dipped in a liquid that wets it. The liquid rises to a point A. If we blow air through the horizontal tube H, what will happen to the liquid column in the capillary tube?

Considering the average molecular mass of a base to be 500 Da, what is the molecular mass of a double stranded DNA of 10 base pairs?

Equal dominance of both sporophyte and gametophyte phases during alternation of generations could be observed in the life cycles of -

Which of the following hormones are produced by non organised endocrine tissue