Q2 of 367 Page 72

What substance/substances are transported in plants by:

(a) xylem vessels and tracheids?


(b) sieve tubes (or phloem)?

(a) Xylem vessels and tracheids are two elements of xylem tissue which help in the transportation of water.

(b) The cells of phloem are called sieve tubes. Sieve tubes are conducting element of phloem which is responsible for transportation of food.


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An organism X having breathing organs A lives on land. When organism X goes under water, it cannot survive for a long time unless carrying an oxygen cylinder. On the other hand, the organism Y having breathing organs B always lives in water and if taken out of water; it dies after a short while. A third organism Z having. breathing organs C and D which lives on the banks of ponds, lakes and rivers can survive on land as well as in water equally well.

(a) What could organism X be ? Name the breathing organs A.


(b) What could organism Y be ? Name the breathing organs B.


(c) What could organism Z be? Name the breathing organs C and D.


(d) Out of X, Y and Z, which organism is (i) amphibian, (ii) aquatic, and (iii) terrestrial ?

 1

What is the name of tissues which transport:

(a) food in a plant?


(b) water and minerals in a plant?

 3

Which organ acts as a pump in the circulatory system?

 4

Veins and arteries carry blood. Which of these carry blood :

(a) away from the heart?


(b) back to the heart?