Introduction
Plants are living organisms that grow in soil and water. They are important because they provide food, oxygen, shelter, and medicine. Studying plants helps us understand their structure, types, and how they survive.
Parts of a Plant
- Root – Anchors the plant and absorbs water and minerals from soil.
- Stem – Supports the plant and transports water, minerals, and food.
- Leaves – Prepare food for the plant through photosynthesis.
- Flowers – Reproductive part of the plant; produce seeds.
- Fruits and Seeds – Help in seed dispersal and propagation.
Types of Roots
- Taproot – Main root grows downward with smaller branches.
Example: Carrot, radish - Fibrous root – Many small roots spread out from the stem.
Example: Grass, wheat
Types of Stems
- Herbaceous stem – Soft, green stem.
Example: Sunflower - Woody stem – Hard, brown stem.
Example: Mango tree
Types of Leaves
- Simple leaf – Single leaf blade.
Example: Mango, guava - Compound leaf – Leaf divided into small leaflets.
Example: Rose, neem
Plant Classification (Based on Stem and Life Cycle)
- Herbs – Small plants with soft stems.
Example: Spinach, coriander - Shrubs – Medium plants with woody stems.
Example: Rose, hibiscus - Trees – Large plants with hard woody stems.
Example: Mango, banyan
Functions of Plants
- Produce oxygen for breathing
- Provide food (fruits, vegetables, grains)
- Provide medicine (e.g., tulsi, neem)
- Give shelter and shade
- Prevent soil erosion
Photosynthesis
- Process by which plants make food using sunlight, water, and carbon dioxide.
- Occurs in the green leaves of plants.
- Produces glucose (food) and oxygen.
Summary
- Plants have roots, stems, leaves, flowers, fruits, and seeds
- Roots absorb water, stems transport it, leaves make food
- Plants are classified as herbs, shrubs, and trees
- Photosynthesis is essential for food and oxygen
Important Questions (Short Answers)
1. What is a plant?
A living organism that grows in soil or water.
2. Why are plants important?
They provide food, oxygen, shelter, and medicine.
3. Name the main parts of a plant.
Root, stem, leaves, flower, fruit, seed.
4. What is the function of roots?
Absorb water and minerals; anchor the plant.
5. Name two types of roots.
Taproot and fibrous root.
6. Give one example of a taproot plant.
Carrot.
7. Give one example of a fibrous root plant.
Grass.
8. What is the function of stem?
Supports plant and transports water and food.
9. Name two types of stems.
Herbaceous and woody.
10. Give one example of a herbaceous stem.
Sunflower.
11. Give one example of a woody stem.
Mango tree.
12. What is the function of leaves?
Prepare food for the plant (photosynthesis).
13. What is the function of flowers?
Reproduction; produce seeds.
14. What is a simple leaf?
A leaf with a single blade.
Example: Mango
15. What is a compound leaf?
A leaf divided into small leaflets.
Example: Neem
16. Name three types of plants based on stem and size.
Herbs, shrubs, trees.
17. Give one example of a herb.
Spinach.
18. Give one example of a shrub.
Rose.
19. Give one example of a tree.
Banyan.
20. What is photosynthesis?
Process by which plants make food using sunlight, water, and carbon dioxide.
21. Where does photosynthesis occur?
In green leaves.
22. What are the products of photosynthesis?
Glucose (food) and oxygen.
23. Name one medicinal plant.
Tulsi or neem.
24. How do plants help in preventing soil erosion?
Their roots hold soil in place.