How does the skin of earthworm help in respiration?
What is the principle behind the diffusion of gases?
Why is it dangerous to sleep in a closed room with an open burning heat stove?
Difference between inspiration and expiration
What is the role of carbonic anhydrase in the transport of gases?
PART -B
All elements that are present in a plant need not be essential to its survival.’ Comment.
Describe the digestive role of chymotrypsin. Which two other digestive enzymes of the same category are secreted by its source gland?
What happens to the respiratory process in a man going up a hill?
Define the oxygen dissociation curve. Can you suggest any reason for its sigmoidal pattern?
PART - C
Draw a diagram of the respiratory system and label the parts.
Draw a diagram of the structure of alveolus and capillary
Difference between vital capacity and total lung capacity.
Draw a diagram of the heart and label the parts.
Difference between single circulation and double circulation.
PART - D
The diffusion of gases occurs in the alveolar region only and not in the other parts of the respiratory system. Why?
Why is that in certain plants deficiency symptoms appear first in younger parts of the plant while in others they do so in mature organs
Define vital capacity. what is its significance?
Explain the process of inspiration under normal conditions.
a) Why are villi present in the intestine and not in the stomach?
b) How does pepsinogen change into its active form?
c) What are the basic layers of the wall of the alimentary canal?
d) How does bile help in the digestion of fats?
Answers
Answer:
1.earthworms respiration process takes place through its moist, thin and highly vascular skin. The oxygen gas absorbed by the skin diffuses into the blood and transported to all the cells of the body. In the cells, oxygen is used up for oxidation of food. During this process, carbon dioxide is produced.
2.A principle of diffusion is that the molecules move around and will spread evenly throughout the medium if they can. However, only the material capable of passing through the membrane will diffuse through it. In this example, the solute cannot diffuse through the membrane, but the water can.
3. In a closed room,the supply of fresh air is almost negligible and since for burning oxygen is required. Due to the burning the available oxygen gets depleted and it leads to incomplete burning of coal and it leads to formation of carbon mono oxide which is very poisonous. ... Never sleep in a closed room with burning coal.
4..The difference between inspiration and expiration is, the inspiration is an active process where it brings air into the lungs while expiration is a passive process, which is the expulsion of the air out of the lungs.