Human Reproduction — BIOLOGY STD 12 Science — Question

Name the kind of cheese which possesses characteristic holes.

How do new species arise according to de Vries mutation theory of organic evolution?

Rearrange the following in increasing order of evolution: Gnetales; Ferns; Zosterophyllum; Ginkgo.

Answer the following questions:
Mature seeds of legumes are non-albuminous. Then, can it be assumed that double fertilisation does not occur in legumes? Explain your answer

Describe the structure of pollen grain and the process of its germination.

List the two main propositions of Oparin and Haldane.

How do Intra Uterine Devices (IUDs) act to prevent unwanted pregnancy in human females?

Name the cells that nourish the germ cells in the testes. Where are these cells located in the testes?

What is the significance of Archaeopteryx in the study of organic evolution?

If the nodules located on the roots of a leguminous plant are destroyed, what will be the effect on the plant? Explain the reason.