Question

An experiment is shown below where a small potted plant is taken and to eliminate evaporation through the surface of the pot and the soil is covered with polythene sheath. The potted plant is then put under a glass bell jar. After sometime drops of water appear on the inner side of the bell jar wall. Name the process demonstrated. *

Answer 1

Answer:

Transpiration mainly takes place through surface of leaves. It is known as Foliar transpiration (more than 90%). Transpiration occurs through young or mature stem is called as Cauline transpiration.

Explanation:

Type # 1. Stomatal Transpiration:

Water vapour diffuses out through minute pore (stomata) present in soft aerial part of plant is known as Stomatal Transpiration. Of the total water loosed, near about 85 – 90% of water loosed by the stomatal transpiration.

Type # 2. Lenticular Transpiration:

Sometimes water may evaporate through certain other openings present on the older stems. These openings are called Lenticels and the transpiration that takes place through term is known as Lenticular Transpiration.

Huber observed in some plants that water lost by lenticular transpiration was about 0.1% of the total transpiration loss. He further noted that coating the bark of the trees reduced the total loss by 20% from total bark surface, showing that some water loss was taking place through general surface of the bark also.

Type # 3. Cuticular Transpiration:

Answer 2

Answer:

Amit went on a mountain for trekking. After reaching at about 2000m height, he experienced difficulty in breathing. His rate of breathing increased and he decided to discontinue the trek and return back to the ground. Being concerned about his health, he consulted his doctor friend about it. His friend explained that it is normal phenomenon and he should have carried an oxygen cylinder while going for the trek.

A) Why is it difficult to breathe as we go up on a height?

B) Why does his friend suggest him to carry an oxygen cylinder?

C) Which component of blood shows increase when someone moves from plains to higher altitudes?

Explanation: