Molecular Basis of Inheritance — BIOLOGY STD 12 Science — Question

What is the fundamental basis of biodiversity in biosphere?

Give the name of plant from which we get cocaine.

What was the idea of early Greek thinkers about origin of life?

OR

What is Theory of Panspermia?

Write name of two hotspot or biodiversity rich areas of India.

Why does the bottled juice purchased from the market appear clearer and cleaner?

In which era of geological time scale mammals dominated the scene?

Mention any two simillar characteristics of human and apes.

How many pollen grains and ovules are likely to be formed in the anther and the ovary of an angiosperm bearing 25 microspore mother cells and 25 megaspore mother cells respectively?

State the function of filiform apparatus found in mature embryo sac of an angiosperm.

Give an example each of the following cases, where:

1. The sperm is responsible.
2. Ovum is responsible for the sex-determination.