Reproductive Health — BIOLOGY STD 12 Science — Question

Given below is a list of autotrophs and heterotrophs. With your knowledge about food chain, establish various linkages between the organisms on the principle of ‘eating and being eaten’. What is this inter-linkage established known as?
Algae, hydrilla, grasshopper, rat, squirrel, crow, maize plant, deer, rabbit, lizard, wolf, snake, peacock, phytoplankton, crustaceans, whale, tiger, lion, sparrow, duck, crane, cockroach, spider, toad, fish, leopard, elephant, goat, Nymphaea, Spirogyra.

A criminal blew himself up in a local market when was chased by cops. His face was beyond recognition. Suggest and describe a modern technique that can help establish his identity.

Describe the technique by which genetic disorder in a developing foetus can be detected.

Identify a, b, c, d, e and f in the table given below:

	Organism	Bioactive molecule	Use
1. 2. 3.	Monascus perpureus (yeast) c e	a d Cyclosporin A	b antibiotic f

How do flowers reward their insect pollinators? Explain.

Correct the following statements:

1. Surgical methods of contraception prevent gamete formation.
2. All sexually transmitted diseases are completely curable.
3. Oral pills are very popular contraceptives among the rural women.
4. In E. T. techniques, embryos are always transferred into the uterus.

Differentiate between two different types of pyramids of biomass with the help of one example of each.

The present population growth rate in India is alarming. Suggest ways to check it.

What is detritus food chain?