Nervous System — Biology STD 10 — Question

Name the Following :
The process by which the unwanted nitrogenous wastes are eliminated from the body.

Name the Following :
A plant having sunken stomata.

Define the following:
Allele

Given below is an example of a certain structure and its special functional activity:
Chloroplasts and Photosynthesis.
In a similar way, write the functional activity against each of the following:
Leaf spines and …………………………

What is the difference between transpiration and evaporation?

State the Function:
Choroid coat in the eye

A candidate studied the importance of certain factors in photosynthesis. He took a potted plant and kept in the dark for over 24 hours. In the early hours of the next morning, he covered one of the leaves with black paper in the centre only. Then he placed the plant in sunlight for a few hours and tested the leaf which was covered with black paper for starch.
Why was the plant kept in the dark before the experiment?

Name two essential structures which take part in fertilization.

Correct the following statements if there is any mistake.
A nucleotide is composed of a sulphate, a sugar (pentose) and a nitrogenous base .

How is soil pollution caused?