Human Reproduction — BIOLOGY STD 12 Science — Question

Birds have evolved from reptiles. How does paleontology provide evidence in support of the above statement?

Give name and functional different type of RNAs.###Name the different types of RNAs.

Comment on the RCH programme of the government to improve the reproductive health of the people

What is self-incompatibility? Why does self- pollination not lead to seed formation in self- incompatible species?

Besides acting as ‘conduits’ for energy transfer across trophic levels, predators play other important roles. Justify.

State the measures to prevent AIDS. ### Explain prevention of AIDS.

Distinguish between the roles of flocks and anaerobic sludge digesters in sewage treatments.

Give the full name of the following.

Construct a grazing food chain and a detritus food chain using the following, with five links in each:
Earthworm, bird, snake, vulture, grass, grasshopper, frog, decaying plant matter.

Mention the possible levels of regulation of gene expression in eukaryotes.