Question

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.

Answer 1

(a)

(i) Blood is the liquid connective tissue that circulates in our body continuously without stopping. Hence, A is blood.

(ii) & (iii) Our blood contains a pigment called haemoglobin, which imparts it a red colour. Hence, pigment B is haemoglobin and colour C is red.

(b)

(i) White blood cells, fight infection and protect us from diseases. Hence, D refers to white blood cells.

(ii) Platelets are the component of blood, which help in the clotting of blood (A). Hence, E refers to platelets.

(iii) Plasma is a liquid, which consists mainly of water with many substances dissolved in it. Hence, F refers to plasma.

(iv) Red blood cells carry oxygen from the lungs to all the parts of the body. Hence, G refers to red blood cells.

(c) Blood also carries the digested food from the small intestine to all other parts of the body.

(d) E (platelets) and G (Red blood cells) are the cells without nucleus.

(e) Amoeba and grasshopper do not have blood (A) like liquid in their body.