Excretion is different in multi-cellular organisms as compared to unicellular organisms. How?

The liquid connective tissue A circulates in our body continuously without stopping. This tissue contains a pigment B which imparts it a colour C. The tissue A consists of four components D, E, F and G. The component D fights infection and protects us from diseases. The component E helps in the clotting of tissue A if a person gets a cut. The component F is a liquid which consists mainly of water with many substances dissolved in it and component G carries oxygen from the lungs to all the parts of the body.

1. What is (i) tissue A, (ii) pigment B and (iii) colour C?
2. Name (i) D, (ii) E, (iii) F and (iv) G.
3. Name one substance (other than oxygen) which is transported by tissue A in the human body.
4. Which two components of tissue A are the cells without nucleus?
5. Name any two organisms (animals) which do not have liquid like A in their body.

1. Why is there a difference in the rate of breathing between aquatic organisms and terrestrial organisms? Explain.
2. Draw a diagram of human respiratory system and label-pharynx, trachea, lungs, diaphragm and alveolar sac on it.

Explain the digestion of chapati in human beings. Draw a diagram depicting human alimentary canal.

How do carbohydrates, fats and proteins get digested in human beings?

Name the main organs of the human digestive system in the order they participate in the process of digestion. Describe how digestion of carbohydrates and proteins take place in our body.

Describe the flow of blood through the heart of human beings.

Each and every respiration organ is structurally specialised in its function. Justify with examples.

X is a wild animal which eats only the flesh of other animals whereas Y is a domestic animal which feeds mainly on green grass.

1. What are animals like X known as?
2. What are animals Y known as?
3. Which animal, X or Y, has a longer small intestine? Why?
4. Name one animal which is like X.
5. Name one animal which is like Y.

1. Name the organs that form the excretory system in human beings.
2. Describe in brief how urine is produced in human body.