Q12 of 231 Page 92

Give one example each of a plant part:
(a) which is positively hydrotropic as well as positively geotropic.

(b) which is positively phototropic but negatively geotropic.

(a) Root of a plant bends towards the water in soil hence shows positive hydrotropic with positive geotropic.

(b) Stem of a plant bend towards the light above the soil hence shows positive phototropic but negative geotropic.

Give the scientific terms used to represent the following:

(a) Bending of a shoot towards light.

(b) Growing of roots towards the earth.

(d) Bending of roots towards water.

(e) Winding of tendril around a support.

Give one example of the movement of a plant part which is caused by the loss of water (or migration of water).

Which of the following is a growth movement and which is not?

(a) folding up of leaves of sensitive plant on touching with hand.

(b) folding up of petals of dandelion flower when light fades.

Name the plant part:

(a) which bends in the direction of gravity but away from light

(b) which bends towards light but away from the force of gravity

Give one example each of a plant part:(a) which is positively hydrotropic as well as positively geotropic.(b) which is positively phototropic but negatively geotropic.