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Biology Chapter 4 : Topic 8
Plant Organs and Their Functions
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Which plant organ is mainly responsible for absorption of water and minerals?
Reasoning: Roots absorb water and minerals from the soil through root hairs.
2 / 15
Which structure in roots increases surface area for absorption?
Reasoning: Root hairs greatly increase absorption efficiency.
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The main function of the stem is to:
Reasoning: Stem supports plant body and transports water and food.
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Which tissue is responsible for upward transport of water in plants?
Reasoning: Xylem carries water and minerals from roots to leaves.
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Which plant organ is mainly responsible for photosynthesis?
Reasoning: Leaves contain chlorophyll for photosynthesis.
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Stomata are mainly involved in:
Reasoning: Stomata allow exchange of oxygen and carbon dioxide.
7 / 15
Which structure prevents excessive water loss from the leaf?
Reasoning: Cuticle is a waxy layer that reduces transpiration.
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Which organ is responsible for reproduction in flowering plants?
Reasoning: Flowers produce seeds through sexual reproduction.
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Phloem tissue is responsible for:
Reasoning: Phloem transports sugars from leaves to other parts.
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Which process mainly occurs in leaves for making food?
Reasoning: Leaves convert sunlight into food using chlorophyll.
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Lenticels are found mainly in:
Reasoning: Lenticels in stems help in gas exchange.
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Which organ system in plants is responsible for transport?
Reasoning: Xylem and phloem form the vascular transport system.
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The root system mainly helps in:
Reasoning: Roots anchor plant and absorb water/minerals.
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Which part of the plant helps in transpiration?
Reasoning: Water loss occurs through stomata during transpiration.
15 / 15
Why are plant organs important for physiology?
Reasoning: Plant survival depends on coordination of all organs. -----------------------------------------------------------------------
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