SSC MTS 2026 PYQ — Question 45

Correct Answer:
Option 1 (By transpiration)

Explanation:
Plants absorb large amounts of water from the soil through their roots, but they only need a small amount for photosynthesis. Plants expel excess water as vapor through tiny pores on the surface of their leaves, called stomata. This process is called transpiration.

Additional Facts:
Cooling Effect: Transpiration cools plants during hot summer days, helping to regulate their temperature.
Water Pull: This process creates a kind of suction force, allowing water to reach the tops of tall trees from the roots.
Stomata: These pores help in transpiration as well as gas exchange (taking in CO2 and releasing O2).
Guttation: Sometimes, at night, when transpiration is low, droplets of water emerge from the edges of leaves, a process called guttation.

Possible questions for upcoming exams:
What instrument is used to measure the rate of transpiration in plants? (Answer: Potometer)
What are the tiny pores on leaves called through which transpiration occurs?
(Answer: Stomata)
In which part of the plant does transpiration occur most frequently?
(Answer: Leaves)