Question

Choose the decreasing order of the rate of transpiration?

• A. Cuticular transpiration > Lenticular transpiration > Stomatal transpiration
• B. Stomatal transpiration > Lenticular transpiration > Cuticlular transpiration
• C. Lenticular transpiration > Stomatal transpiration > Cuticular transpiration
• D. Lenticular transpiration > Cuticular transpiration > Stomatal transpiration

Answer 1

The correct option is B

Explanation of the correct option:

1. Stomatal transpiration > Cuticular transpiration > Lenticular transpiration
2. Stomatal transpiration accounts for almost 90% of the total transpiration.
3. Cuticular transpiration accounts for 5-10 % whereas, lenticular transpiration accounts for 0.1% of the total transpiration.
4. So, the correct answer is 'Stomatal → Cuticular → Lenticular'.
5. Depending on the organ that performs transpiration, the different types are:
6. Stomatal transpiration: It is the evaporation of water through stomata. Stomata are specialized pores in the leaves. They account for around 80 to 90% of the total water loss from the plants.
7. Cuticular transpiration: Cuticle is an impermeable covering present on the leaves and stem. It causes around 20% of transpiration in plants. Cuticular transpiration is lesser in xerophytes because they have thicker cuticles.
8. Lenticular Transpiration: It is the evaporation of water through lenticels. Lenticels are the tiny openings present on the woody bark.

Final answer: the correct answer is 'Stomatal → Cuticular → Lenticular'.