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How many generations of mitotic division must occur in a cell of root tip to form 256 cells?

Acid rain is caused by excess

Which of the following has a carbohydrate, as its prosthetic group?

Chief cells secrete____________

The difference between alpha and beta forms of pyranose ring is that

Each square metre of sun’s surface radiates energy at the rate of $6.27\times {10}^{7}W{m}^{-2}$. Assuming that Stefan’s law applies to the radiation, the temperature of sun’s surface is (Stefan’s constant $\sigma =5.7\times {10}^{7}W{m}^{-2}{K}^{-4}$)

Which of the following is a rich source of energy and does not cause pollution?

Which of the following is used in the preparation of Roquefort cheese?

In embryo sac, n, 2n, 3n conditions are found respectively in

CAM plants keep stomata closed in daytime, thus reducing loss of water. They can do this because they

A chart that represents the possible gene combinations of progeny in a known cross is called:

Which of the following is a mismatch?

Guttation is:

The feedback mechanism in cells means:

How many types of gametes are obtained from a plant of genotype YYRr?

Supporting roots of sugarcane arise from:

Given below are four methods (A-D) and their mode of action (1-4) in achieving contraception. Select the correct pair from the options given below:

$\begin{array}{cccc}& \text{Method}& & \text{Mode of Action}\\ \left(a\right)& \text{The pill}& \left(1\right)& \text{Prevents sperm reaching cervix}\\ \left(b\right)& \text{Condom}& \left(2\right)& \text{Prevents fertilisation}\\ \left(c\right)& \text{Vasectomy}& \left(3\right)& \text{Prevents ovulation}\\ \left(d\right)& \text{Copper-T}& \left(4\right)& \text{Semen contains no sperm}\end{array}$

AIDS can be prevented by:

Bamboo trees growing in a fir (species of evergreen coniferous trees) forest belong to which trophic level ?

Humerus bone is found in________

Roquefort cheese is ripened by using a _____.

Match the following list of bioactive substances and their roles:

$\begin{array}{cc}BioactiveSubstance& Role\\ \left(i\right)Statin& \left(a\right)Removalofoilstains\\ \left(ii\right)CyclosporinA& \left(b\right)Removalofclotsfrombloodvessels\\ \left(iii\right)Streptokinase& \left(c\right)Loweringofbloodcholesterol\\ \left(iv\right)Lipase& \left(d\right)Immuno-suppressiveagent\end{array}$

The serous membrane which covers the lungs is called:

The phenotypic ratio for Mendel’s dihybrid cross is

Males in animals always possess two distinct sex chromosomes, while females have the same sex chromosomes. Which of the following disproves this statement?

Match the hormones with the event they control in menstrual cycle

Which of the following organ is called ‘graveyard of RBCs’?

In photosynthesis, the most useful colors of the light spectrum are

Vesicular Arbuscular Mycorrhiza(VAM) is important for:

The process of organ formation start:

Nutrients that are required by plants in smaller quantities are considered as

Acid rains occur in

Secretion of progesterone by corpus luteum is initiated by

Lacteals are lymphatic vessels found in the

In a plant red colour fruit is dominant over yellow colour. When these two pure lines are crossed, the probability of producing $F_2$ homozygous plants with red fruits, heterozygous plants with red fruits, and plants with yellow colored fruits respectively is

The membranous cover of the ovum at ovulation is

Which of the following is true about reverse transcriptase?

Bulliform cells take part in:

July 11 is

Emerson's enhancement effect leads to the conclusion that

The layer of fibrous connective tissue that surrounds each kidney is

Choose the correct labels for I, II and III from the options given below:

Which of the following statements are true for innate immunity?

_____ pairs of spinal nerves are present in the human spinal cord.