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SingaporeCombined ScienceQuick questions
Biology: Plants and Nutrition
Quick questions on Transport in plants and transpiration explained: O-Level Combined Science
7short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What are two transport tissues?Show answer
Plants have two transport tissues:
What are water uptake by the roots?Show answer
Water is absorbed from the soil by root hair cells. Each has a long, thin extension giving a large surface area, and water enters by osmosis because the cell sap has a lower water concentration than the soil water. Mineral ions are absorbed by active transport (against their concentration gradient).
What is the transpiration stream?Show answer
Water travels up the xylem from roots to leaves in a continuous column, the transpiration stream. It is pulled up because water evaporates from the leaf cells and is lost through the stomata; this loss creates a "pull" that draws more water up the xylem behind it.
What is transpiration?Show answer
Transpiration is the loss of water vapour from a plant, mainly through the stomata in the leaves. Water evaporates from the moist surfaces of the leaf cells and the vapour diffuses out through the open stomata. Transpiration pulls water and minerals up the plant and helps cool the leaves.
What is q1?Show answer
State what xylem transports and what phloem transports. [2 marks]
What is q2?Show answer
Explain how water enters a root hair cell from the soil. [2 marks]
What is q3?Show answer
State two factors that increase the rate of transpiration. [2 marks]
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