Question

Which of these do not show transpiration?
(A)Aquatic plants with floating leaves
(B)Aquatic submerged plants
(C)Plants growing in hilly areas
(D)Plants living in deserts

Answer 1

Hint: The name of the plants which do not show transpiration are Cabomba, Fanwort, Brittle Naiad, Marine Naiad, and many more. These plants are surrounded by water every time and due to this reason, pollination is also done by the water.

Complete step by step answer:
Aquatic submerged plants don't have any stomata present on the leaf surface because these plants don't require stomata pore meant for gaseous exchange, instead, the gaseous exchange may be carried out by diffusion through the leaf surface. It was seen that the submerged aquatic plants do not have a cuticle structure, the main function of the cuticle is to stop excess water through transpiration as there's no stomata and transpiration so the cuticle layer is additionally absent.

So, the correct answer is ‘Aquatic submerged plants’.

Additional information: Transpiration- It is the basic process that occurs in plants. It involves the movement of water molecules through a plant and also its evaporation from aerial parts of the plants, which include the leaves, stems, and also the flowers. Water is important for plants but only a little amount of water taken up by the roots is employed for growth and metabolism. The remaining 96 to 99.5% is lost by transpiration and guttation. Leaf surfaces have some pores associated with them which is known as stomata, and in most plants, they're more numerous on the undersides of the foliage. The stomata of the plants are bordered by the guard cells and their stomatal accessory cells (together referred to as stomatal complex) that open and close the pore. Transpiration occurs through the stomatal apertures and may be thought of as a necessary "cost" related to the opening of the stomata to permit the diffusion of ${ CO }_{ 2 }$ gas from the air for the process of photosynthesis.

Note:
It was observed that many desert plants have very small stomata and fewer stomata than those of other plants. Small leaves of the desert plants also help them to reduce moisture loss during transpiration. Small leaves mean less evaporative surface per leaf.