Question Bank [2022] — BIOLOGY STD 12 Science — Question

Method of asexual reproduction in sponges.

Following are the steps in MOET programme for herd improvement in which a cow has been administered hormones with FSH like activity. Arrange steps A to D in their correct sequence.

1. Transferred to a surrogate mother.
2. It is either mated with an elite bull or artificially inseminated.
3. Fertilised eggs at 32 cell stage are recovered non-surgically.
4. It produces 6-8 eggs instead of one egg which they normally yield per cycle.

What Allen’s rule indicates in adaptation?

The substance synthesized in cell responsible for increasing osmotic concentration as per Munch theory.

An electrostatic precipitator in a thermal power plant is not able to generate high voltage of several thousands. Write the ecological implication because of it.

Arrange the following as observed in vertical stratification of a forest: Grass, Shrubby plants, Teak, Amaranths.

What lac operon consists of?

Give definitions: Replicon

Why are spermicidal creams used along with the female barriers like diaphragms?

The corona radiata of an ovum acts as a barrier for the penetration of sperms. How do sperms overcome this barrier?