Microbes in Human Welfare — BIOLOGY STD 12 Science — Question

Name one bisexual and one unisexual animal.

Males in whom testes fail to descend to the scrotum are generally infertile. Why?

Name the greenhouse gases contributing maximum to the greenhouse effect.

Mention any two characteristics of pollen in plants such as maize and coconut palm to suit the kind of pollination in them.

Given below are the events in human reproduction. Write them in correct sequential order.
Insemination, gametogenesis, fertilisation, parturition, gestation, implantation.

The following statements (i), (ii) and (iii) seem to describe the water-pollinated 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 stalks to reach the surface.

Write the full name of NAC.

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

Which is triploid tissue in a fertilised ovule?

What is the raw material for polyblend?