Pollution — Biology STD 10 — Question

Short answer
Mouth dries up and heartbeat increases during public speaking. Explain.

Give the functions of the spinal cord?

What is the difference between chloroplast and the chlorophyll?

List three major landmarks in human history which contributed to the sudden rise in population of the world.

Two potato cubes each 1 cm3 in size, were placed separately in two containers (A and B), the container A having water and the other (B) containing concentrated sugar solution. After 24 hours when the cubes were examined, those placed in water were found to be firm and had increased slightly in size and those placed in concentrated sugar solution were found to be soft and somewhat decreased in size. Use the above information to answer the questions that follow: Name and define the physical process being investigated in this experiment.

How are humans protected against bacterial infection?

Explain the Term: Voluntary-action

Arrange and rewrite the terms in each group in correct order so as to be in a logical order
(i) Hydrilla plant, Air bubbles, Test tube, Funnel
(ii) Destarch plant, Iodine test, Boil in alcohol, Boil in water

Is it possible for the blood to clot under the skin? Give reason in support of your answer.

Give suitable explanation for the following:
A higher rate of transpiration is recorded on a windy day rather than on a calm day.