DAV Class 4 Science Chapter 2: Plants – Complete Question Answers
Introduction
Plants are an important part of our environment. They provide us with food, oxygen, medicines, wood, and many other useful things. A plant has different parts, and each part performs a special function. In this chapter, we learn mainly about roots, their different types, their functions, and some special roots found in certain plants.
Below are the complete solved questions and answers for DAV Class 4 Science Chapter 2 – Plants.
Something to Know
A. Fill in the Blanks
1. __________ is the underground part of a plant.
Answer: Root
The root is the part of a plant that generally grows below the ground.
2. Roots absorb __________ and __________ for the plant.
Answer: Water and minerals
Roots absorb water and minerals from the soil and supply them to the plant.
3. Neem and peepal have __________ roots.
Answer: Tap roots
Neem and peepal trees have a main root that grows deep into the soil. This type of root is called a tap root.
4. __________ and __________ are two main functions of roots.
Answer: Absorption and fixation
Roots absorb water and minerals from the soil. They also fix or anchor the plant firmly in the soil.
5. Mangrove plants have __________ roots.
Answer: Aerial roots
Mangrove plants grow in marshy areas. Their roots come out of the soil to get sufficient oxygen.
B. Write True or False for the Following Statements
1. Carrot and beetroot store food in them.
Answer: True
Carrot and beetroot are roots that store food.
2. Beans and rose have fibrous roots.
Answer: False
Beans and rose do not have fibrous roots.
3. All roots are edible.
Answer: False
Only some roots are edible. Examples include carrot, radish, beetroot, and sweet potato.
4. Roots do not get sufficient oxygen in marshy areas.
Answer: True
The roots of plants growing in marshy areas may not get enough oxygen from the soil.
C. Tick (✓) the Correct Option
1. The root of this plant stores food.
(a) Mango
(b) Apple
(c) Banana
(d) Carrot ✓
Answer: Carrot
Carrot is an example of a root that stores food.
2. This plant has a tap root.
(a) Banana
(b) Grass
(c) Wheat
(d) Rose ✓
Answer: Rose
Rose is a plant with a tap root.
3. These plants have breathing roots.
(a) Mangrove ✓
(b) Apple
(c) Neem
(d) Peepal
Answer: Mangrove
Mangrove plants have special roots that help them get sufficient oxygen in marshy areas.
D. Answer the Following Questions in Brief
1. Name the two different types of roots.
Answer:
The two main types of roots are:
- Tap root
- Fibrous root
2. Give two examples of plants having fibrous roots.
Answer:
Two examples of plants having fibrous roots are:
- Grass
- Wheat
3. Why do aerial roots need to come out of the soil?
Answer:
Roots of plants growing in marshy areas do not get sufficient oxygen. Therefore, aerial roots come out of the soil. This helps the roots get enough oxygen.
E. Answer the Following Questions
1. Draw the shape of the tap root and the fibrous root.
Answer:
Tap Root
A tap root has one main, thick root that grows downward into the soil. Smaller roots grow from the main root.
Examples: Neem, peepal, rose and mustard.
Fibrous Root
A fibrous root has many thin roots of almost the same size. These roots spread out from the base of the stem.
Examples: Grass and wheat.
Answer: Do the drawing as instructed in the textbook activity.
2. In what way is the tap root different from the fibrous root?
| Tap Root | Fibrous Root |
|---|---|
| A single, long main root comes out from the plant. | Many roots come out from the base of the plant. |
| It usually grows deeper into the soil. | It does not grow much deeper into the soil. |
| Smaller roots grow from the main root. | Many thin roots grow together. |
3. State two main functions of roots.
Answer:
The two main functions of roots are:
- Anchoring the plant firmly in the soil.
- Absorbing water and minerals from the soil.
4. In what way are the roots of banyan tree and maize ‘special’?
Answer:
The roots of banyan tree and maize serve a special purpose. These roots provide extra support to the banyan tree and the maize plant. Therefore, the roots of banyan and maize are called special roots.
Value-Based Questions
1. What does the above situation tell us about Rohan?
Answer:
Rohan appears to be a nice and caring boy. He is concerned about the environment and also understands the difficulties faced by poor people.
2. How did he help the watchman?
Answer:
Rohan helped the watchman by giving him a blanket.
3. Rohan stopped the watchman from cutting trees. Have you ever done anything similar to save your environment?
Answer:
Yes. Once, while playing in a nearby park, I saw a gardener trying to burn a heap of dry leaves. I explained to him that burning leaves was harmful to the environment. The gardener understood and stopped burning the leaves. He buried the leaves in a pit to make compost. In this way, I tried to help protect the environment.
Something to Do
1. Observe the roots of grass and mustard plants.
Take a small sapling of grass and a mustard plant. Observe their roots and note down the differences.
Answer:
The mustard plant has a tap root, while grass has fibrous roots.
2. Prepare a chart showing some edible roots and the ways in which they are eaten.
Answer:
| Edible Root | Way of Eating |
|---|---|
| Carrot | Raw and cooked |
| Radish | Raw and cooked |
| Beetroot | Raw and cooked |
| Sweet potato | Cooked |
Important Points to Remember
- The root is generally the underground part of a plant.
- Roots absorb water and minerals from the soil.
- Roots help to fix or anchor a plant firmly in the soil.
- The two main types of roots are tap roots and fibrous roots.
- Neem, peepal, and rose have tap roots.
- Grass and wheat have fibrous roots.
- Carrot, radish, beetroot, and sweet potato are examples of edible roots.
- Some plants growing in marshy areas have aerial or breathing roots.
- Mangrove plants have aerial roots.
- Banyan and maize have special roots that provide extra support.
Conclusion
Roots are an important part of a plant. They perform many essential functions, such as absorbing water and minerals and holding the plant firmly in the soil. Different plants have different types of roots depending on their needs and surroundings.
By studying tap roots, fibrous roots, aerial roots, edible roots, and special supporting roots, students can better understand how plants survive and grow in different environments.
