Give reasons for:

1. People climbing to high altitudes may suffer from dizziness and unsteady vision.
2. Lime water is used in most experiments on respiration.
3. Respiration rate is higher in animals than in plants.

Given along side is an experiment intended to demonstrate the action of diaphragm, but some thing has gone wrong.

What is the mistake in the diagram? Explain.

The ultimate end parts of the respiratory system in humans are known as

1. Alveoli
2. Bronchioles
3. Tracheoles
4. Bronchi

During respiration there is

1. Gain in dry weight
2. Loss in dry weight
3. No change in dry weight
4. Increase in the overall weight