Reproduction in Lower and Higher Animals — BIOLOGY STD 12 Science — Question

How is biotechnology useful in increased insulin production to benefit needy people?

Interspecific hybridization

The following statements (i), (ii) and (iii) seem to describe the waterpollinated submerged plants. Which one of these statements is incorrect?

1. The flowers do not produce nectar.
2. The pollen grains have mucilaginous covering.
3. The brightly coloured female flowers have long stalk to reach the surface.

Give an example of plant having both kidney and dumbbell shaped guard cells in stomata.

Write the chromosomal basis of sex-determination in birds.

State the 10% law. Who gave this law?

Structures which help in transport of secondary oocyte through uterine tube.

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

Restriction endonucleases which produce fragments with sticky ends.

Justify the pitcher plant as a producer.