The steps of PCR (Polymerase Chain Reaction) are given below. Arrange them in a correct sequence.
A. Extension of primers
B. Denaturation of DNA fragments by heating
C. Amplified DNA fragments
D. Annealing of primers
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Which layer of microsporangium provides nutrition to the developing pollen grains?

Read the following paragraph and answer the given questions.
RNAi takes place in all eukaryotic organisms as a method of cellular defense. The source of this complementary RNA could be from an infection by viruses having RNA genomes or mobile genetic elements (transposons) that replicate via an RNA intermediate. Insulin from an animal source, though caused some patients to develop allergy or other types of reactions to the foreign protein. Insulin consists of two short polypeptide chains: chain A and chain B, that are linked together by disulphide bridges. Transgenic mice are being developed for use in testing the safety of vaccines before they are used on humans. Transgenic mice are being used to test the safety of the polio vaccine. If successful and found to be reliable, they could replace the use of monkeys to test the safety of batches of the vaccine. Specific Bt toxin genes were isolated from Bacillusthuringiensis} and incorporated into the several crop plants such as cotton. The choice of genes depends upon the crop and the targeted pest, as most Bt toxins are insect-group specific. The toxin is coded by a gene cryIAc named cry. There are a number of them, for example, the proteins encoded by the genes cryIAc and cryIIAb control the cotton bollworms, that of cryIAb controls corn borer.

Which of these is not present in mature insulin?

Zygote or embryos upto 8 blastomeres can be transferred into the fallopian tube for further development. The procedure is known as:

Identify the correct sequence of structures formed during spermatogenesis.
(A) Spermatozoa
(B) Secondary spermatocytes
(C) Spermatogonia
(D) Spermatids
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Arrange the following steps of curd formation from milk.
(A) Coagulation and partial digestion of milk protein
(B) Growth of starter culture
(C) Growth of lactic acid bacteria (LAB) in milk
(D) A small amount of curd is added as an inoculum to fresh milk
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Arrange the events of dicot embryo development in the correct sequence:
(A) Formation of heart-shaped embryo
(B) Formation of mature dicot embryo
(C) Formation of zygote
(D) Formation of globular embryo

Which type of interaction is shown by the marine fish and copepods:

Which of the following statements is incorrect with respect to the use of a catalyst in the reversible reaction?

\(x\)-axis, \(y=\cos x\) and \(y=\sin x, 0 \leq x \leq \frac{\pi}{2}\) is:

While charging the lead storage battery......

Match List I with List II

LIST I	LIST II
A. RNA interference	I. alpha-lactalbumin enriched food
B. Bt cotton	II. Vitamin A enriched food
C. Golden rice	III. Resistant to boll worms
D. Rosie	IV. To develop nematode resistance crops

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What will be the product of the following reaction :
\(C_6H_5ONa + C_2H_5Cl \rightarrow ?\)