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

Why does an AIDS patient suffer from many other infections?

Write the names of hormones and the glands secreting them for the regulation of Basal Metabolic rate.

What is size of E. coli cell?

What is the method of directly injecting a sperm into ovum called as?

Name the following : Two patterns of biodiversity

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.

Pick out the ancestral line of cycads from the list given below-
Ferns, herbaceous lycopods, seed ferns and horsetails.

Name the embryonic stage that gets implanted in the uterine wall of a human female.

How is the action of restriction endonucleases different from that of normal endonucleases?

Name one organism where chain budding is found.