Imp Questions For All Chapters – General Science Class 7
Plants : Structure and Function
Short Questions
1. What are roots?
→ Roots are the underground part of a plant that absorb water and nutrients.
2. What are the two main types of roots?
→ Taproot and fibrous root.
3. Which type of root does a mango tree have?
→ Mango trees have taproots.
4. What is the function of root hairs?
→ Root hairs absorb water and minerals from the soil.
5. What is an internode?
→ The space between two nodes on a stem is called an internode.
6. What is the function of a stem?
→ The stem supports the plant and transports water, food, and nutrients.
7. Which plant has a weak stem and needs support to grow?
→ A climber like a money plant.
8. Why do desert plants have thick stems?
→ To store water.
9. What are aerial roots?
→ Roots that grow above the ground, like in a banyan tree.
10. Which part of a plant makes food?
→ Leaves make food through photosynthesis.
11. What is the main function of leaves?
→ Leaves prepare food using sunlight, water, and carbon dioxide.
12. Why do lotus leaves repel water?
→ Lotus leaves have a waxy coating that prevents water from sticking.
13. Why do cacti have spines instead of leaves?
→ To reduce water loss in deserts.
14. What is the role of chlorophyll?
→ Chlorophyll helps in photosynthesis by absorbing sunlight.
15. What are tendrils?
→ Tendrils are thin, curling structures in some plants that help them climb.
Long Questions
1. What would happen if big trees had fibrous roots?
→ Big trees need strong taproots to stand firm. If they had fibrous roots, they would fall easily during strong winds.
2. Why are cactus stems thick and fleshy?
→ Cactus stems store water for dry conditions and perform photosynthesis since they lack proper leaves.
3. What will happen if the root tip is injured?
→ If the root tip is damaged, the plant cannot absorb water and nutrients properly, affecting its growth and survival.
4. How do plants in water survive?
→ Aquatic plants have lightweight, spongy stems and waxy leaves that help them float and absorb oxygen from water.
5. Why do desert plants have deep roots?
→ Desert plants grow deep roots to reach underground water and survive in hot, dry conditions with very little rainfall.
6. What are the adaptations of a penguin for cold regions?
→ Penguins have thick skin, a fat layer for warmth, and webbed feet to swim in icy waters efficiently.
7. How do leaves help in photosynthesis?
→ Leaves contain chlorophyll, which absorbs sunlight to make food using carbon dioxide and water through photosynthesis.
8. Why is a camel called the ‘ship of the desert’?
→ Camels have long legs for walking on sand, store water in their bodies, and survive for days without food or water.
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