Which layer of microsporangium nourishes the developing pollen grains?

Which one of the following contributes the maximum percentage to the biodiversity of a vertebrate group?

The capacity to generate a whole plant from any cell/explant in culture medium is called as:

Identify curative method (s) used to treat ADA deficiency disease in human.
A. Gene Therapy
B. Bone Marrow Transplantation
C. Complete Blood Replacement
D. Enzyme Replacement Therapy
Choose the correct answer from the options given below:

The exine of pollen grains is made up of :

Match List - I with List - II.

List - I (Organism)	List - II (Sex chromosomes)
(A) Male grasshopper	(I) XY
(B) Male Drosophila	(II) ZX
(C) Female bird	(III) XX
(D) Female grasshopper	(IV) XO
	(V) ZW

Choose the correct answer from the options given below:

Which of the following step is not the part of downstream processing?

The product of the following reaction is :
Reactant: 2,2-Dimethylcyclohexanol
Reagents: \(H ^{ + } /\) heat

The unit vector in the xy-plane, making an angle of \(60^{\circ}\) with the positive direction of x-axis is:

The area of the region bounded by \(y=|x-5|, x=0\) and \(x=1\) is :

There are two kinds of nucleases - exonucleases and endonucleases. Exonucleases remove nucleotides from the ends of the DNA whereas, endonucleases make cuts at specific positions within the DNA. The cutting of DNA by restriction endonucleases results in the fragments of DNA. These fragments can be separated by a technique known as gel electrophoresis. Since DNA fragments are negatively charged molecules they can be separated by forcing them to move towards the anode under an electric field through a medium/matrix. Small volume cultures cannot yield appreciable quantities of products. To produce in large quantities, the development of bioreactors, where large volumes (100 - 1000 litres) of culture can be processed, was required. Thus, bioreactors can be thought of as vessels in which raw materials are biologically converted into specific products, individual enzymes, etc., using microbial plant, animal or human cells. PCR stands for Polymerase Chain Reaction. In this reaction, multiple copies of the gene (or DNA) of interest are synthesised in vitro using two sets of primers (small chemically synthesised oligonucleotides that are complementary to the regions of DNA) and the enzyme DNA polymerase.
Which one of the following statements is correct about DNA separation and isolation?

A pair of dice is thrown 5 times. If getting a total of 7 is considered a success, then the probability of at least 3 successes is :

Positively charged particles are projected into a magnetic field. If the direction of magnetic field is along the direction of motion of the charged particles, the particles will experience