Microbes in Human Welfare — BIOLOGY STD 12 Science — Question

Identify A, B, C and D in the following table:

Scientific name of the source plant	Drug	Harmful effects/ Human body part affected
Papaver somniferum	A	Depressant/ slows body functions
Cannabis sativa	Cannabinoids	B
Erythroxylon coca	C	D

Arrange the following terms in the correct developmental sequence:
Pollen grain, sporogenous tissue, microspore tetrad, pollen mother cell, male gametes.

Explain (in one or two lines) the function of the followings:

Why are drinks like Whisky and Rum are more intoxicating than wine?

How do cyanobacteria act as biofertiliser?

How are ‘sticky ends’ formed on a DNA strand? Why are they so called?

Lianas are vascular plants rooted in the ground and maintain erectness of their stem by making use of other trees for support. They do not maintain direct relation with those trees. Discuss the type of association the lianas have with the trees.

Name the type of fruit, apple is categorised under and why? Mention two other examples, which belong to the same category as apple.

A vector is engineered with three features which facilitate its cloning within the host cell. List the three features and explain each one of them.

The crystals of Bt-toxin protein synthesized by some bacteria kill insects but not themselves. Explain the statement with reasons.