Science — AI-generated practice question

Transpiration is the process by which plants lose excess water in the form of water vapour, mainly through stomata present on the leaves.

Dual importance beyond water loss:

1. Helps in water and mineral transport: Transpiration creates a pull (suction force) that draws water and dissolved minerals upward from the roots through the xylem to all parts of the plant.

1. Excretion of excess water: Plants cannot regulate how much water they absorb from the soil, so transpiration helps remove this excess water, functioning as a form of excretion to maintain water balance.

Source: Chapter 5, Section 5.5.2 (Excretion in Plants); Section 5.2.1

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• Examiners expect a clear one-line definition first, then two distinct points of importance, each explained briefly. Do not just say "it cools the plant" — the textbook emphasises the transpiration pull for xylem transport and removal of excess water as an excretory function.
• The phrase "transpiration pull" is key terminology for the transport benefit.
• Avoid padding with general facts about photosynthesis or stomata structure — stay focused on what the question asks.