The DAV Class 4 Science Book Solutions and DAV Class 4 Science Chapter 4 Question Answer – Plants Around Us are essential study tools for DAV public school students in Class 4.
DAV Class 4 Science Chapter 4 Question Answer – Plants Around Us
DAV Class 4 Science Ch 4 Question Answer – Plants Around Us
Something To Know
A. Fill in the blanks.
Question 1.
Plants, growing on hills, are tall, straight and have a ______ shape.
Answer:
conical
Question 2.
______ and ______ are two of the trees that grow on plains.
Answer:
neem, banyan
Question 3.
Breathing roots are also called ______ roots.
Answer:
aerial
Question 4.
______ is an underwater plant.
Answer:
hydrilla
Question 5.
Lotus stem is eaten as a ______
Answer:
vegetable.
B. Match the following:
| Column A | Column B |
| 1. Evergreen trees | (a) Rice |
| 2. Needle like leaves | (b) Cactus |
| 3. No leaves | (c) Mangrove |
| 4. Breathing roots | (d) Aquatic plant |
| 5. Air filled cavities | (e) Rubber and teak |
| 6. A cultivated crop | (f) Pine and cedar |
Answer:
| Column A | Column B | |
| 1. Evergreen trees | E | (a) Rice |
| 2. Needle like leaves | F | (b) Cactus |
| 3. No leaves | b | (c) Mangrove |
| 4. Breathing roots | c | (d) Aquatic plant |
| 5. Air filled cavities | d | (e) Rubber and teak |
| 6. A cultivated crop | a | (f) Pine and cedar |
C. Tick ( ✓) the correct option.
1. It is a free floating plant
(a) water hyacinth
(b) hydrilla
(c) coconut
(d) lotus
Answer:
(a) water hyacinth
2. These are unwanted plants
(a) cactus
(b) grass
(c) mangroves
(d) weeds
Answer:
(d) weeds
3. It can survive in soil with very little water
(a) banyan
(b) teak
(c) rubber
(d) cactus
Answer:
(d) cactus
D. Answer the following Questions in brief.
Question 1.
What are terrestrial plants?
Answer:
Plants which grow on land are called terrestrial plants.
Question 2.
How does the conical shape help the plants of hills?
Answer:
The conical shape prevent accumulation of snow on leaves. Thus plants are saved from any damage.
Question 3.
Name two trees growing in hot and wet regions.
Answer:
Teak and rubber
Question 4.
Name an underwater plant. What kind of leaves does it have?
Answer:
Hydrilla is an undemater plant. It has ribbon-shaped leaves.
Question 5.
What is ploughing?
Answer:
Digging and loosening the soil is called ploughing.
E. Answer the following Questions.
Question 1.
List different habitats of terrestrial plants.
Answer:
Different habitats of terrestrial plants are as follows:
(a) Hills
(b) Plains
(c) Deserts
Question 2.
How is cactus plant able to grow in desert conditions?
Answer:
Cactus plant has well developed roots which go deep in the ground. The stem of cactus plant is green and looks like leaf. The leaves are fleshy and store water. Leaves have turned into spines. These features help a cactus to grow in desert.
Question 3.
What are aquatic plants? State their types and give two examples of each type.
Answer:
Plants which grow in water are called aquatic plants. There are two main types of aquatic plants:
(a) Floating Aquatic Plants: The floating aquatic plants are of two types:
- Free floating plants: These plants are not attached to any surface. Their leaves have air filled cavities. This helps these plants in floating on water. Examples: water lettuce, water hyacinth, duckweed, etc.
- Fixed aquatic plants: These plants are fixed to the bottom with their roots. Stems of these plants are very long and have holes in them. Leaves are very broad in these plants. Examples: lotus and water lily. Lotus stem (kamal kakri) is eaten as vegetable.
(b) Underwater Plants: Undemater plants have ribbon like leaves. Example: Hydrilla.
Question 4.
What are cultivated plants?
Answer:
When a plant is grown by human beings for any use, it is called cultivated plant. Human beings grow rice, wheat, maize, cotton, etc. on large scale.
Question 5.
Why should weeds be removed from the fields?
Answer:
Weeds consume water and fertilizers meant for the crop. Thus, weeds are harmful for crops. So, weeds need to be removed from the fields.
Value Based Questions
Question 1.
How do we know that Ramesh is a very caring boy?
Answer:
Ramesh felt very sad when he saw his grandfather in the fields. He talked to his father about the problems. This shows that Ramesh is a very caring boy.
Question 2.
What kind of man is Ramesh’s father?
Answer:
Ramesh’s father is also a caring person.
Question 3.
How can you help your grandparents?
Answer:
We can help our grandparents in following ways:
(a) Reading out newspaper for them.
(b) Helping them in morning walk.
(c) Fetching things for them.
(d) Bringing medicines for them.
Use the Help Box to complete where the following plants/trees grow.
Help box: hills, plains, water, desert
(a) Pine trees are found in ______
Answer:
hills
(b) Cactus is found in ______
Answer:
desert
(c) Neem and banyan trees are found in ______
Answer:
plains
(d) Lotus and water lily are found in ______
Answer:
water
DAV Class 4 Science Chapter 4 Solutions – Plants Around Us
I. Multiple Choice Questions.
1. Which of the following is found in hills?
(a) Deodar
(b) Mango
(c) Banyan
(d) Neem
Answer:
(a) Deodar
2. Which of the following grows in plains?
(a) Pine
(b) Banyan
(c) Spruce
(d) Doedar
Answer:
(b) Banyan
3. Which of the following grows in desert?
(a) Mangrove
(b) Hyacinth
(c) Cactus
(d) Pine
Answer:
(c) Cactus
4. Which of the following plants grows under water?
(a) Hydrilla
(b) Water lettuce
(c) Water lily
(d) Lotus
Answer:
(a) Hydrilla
5. Which of the following is a crop?
(a) Duckweed
(b) Cotton
(c) Teak
(d) Amaranthus
Answer:
(b) Cotton
II. Fill in the blanks:
Question 1.
Plants of hills have needle-shaped ______
Answer:
leaves
Question 2.
______ trees do not shed leaves in any particular season.
Answer:
evergreen
Question 3.
______ plants have aerial roots.
Answer:
Mangrove
Question 4.
______ of cactus have turned into spines.
Answer:
Leaves
Question 5.
______ of cactus looks like a leaf.
Answer:
Stem.
III. Write True or False for the following:
1. Leaves of banyan are needle-shaped.
2. Evergreen trees have a large number of leaves.
3. Aerial roots help a plant in sucking water.
4. Cactus grows in desert.
5. Deodar is an aquatic plant.
6. Hydrilla is a free floating plant.
Answer:
1. Leaves of banyan are needle-shaped. (False)
2. Evergreen trees have a large number of leaves. (True)
3. Aerial roots help a plant in sucking water. (False)
4. Cactus grows in desert. (True)
5. Deodar is an aquatic plant. (True)
6. Hydrilla is a free floating plant. (False)
IV. Answer the following Questions in one word:
Question 1.
Plants which grow on land are known by which name?
Answer:
Terrestrial plant
Question 2.
Plants which grow in water are known by which name?
Answer:
Aquatic plant
Question 3.
Which type of plants grows in marshy areas?
Answer:
Mangrove
Question 4.
What is irrigation?
Answer:
Supplying water to crops is called irrigation.
Question 5.
What is the meaning of word ‘aqua’?
Answer:
Water.
V. Answer the following Questions in brief:
Question 1.
What do you understand by sowing of seeds?
Answer:
After ploughing, farmers sprinkle seeds in the field. This is called sowing of seeds.
Question 2.
Why are weeds harmful?
Answer:
Weeds consume water and fertilizers meant for crops. Hence, weeds are harmful.
Question 3.
What are the key features of plants growing on hills?
Answer:
Plants growing on hills are tall and straight. Their leaves are needleshaped. These plants are conical in shape.
Question 4.
How does a hydrilla plant able to live underwater?
Answer:
The leaves of hydrilla are ribbonshaped. This helps the plant to withstand fast current of water. Thus, hydrilla is able to live underwater.
Question 5.
Write the main steps of cultivation.
Answer:
The main steps of cultivation are as follows:
(a) Ploughing
(b) Sowing
(c) Irrigation
(d) Weeding
(e) Harvesting.
DAV Class 4 Science Chapter 4 Notes – Plants Around Us
→ Terrestrial Plants: Plants which grow on land are called terrestrial plants.
→ Plants of Hills: These plants are tall and straight and have conical shape. Their leaves are narrow and needle shaped. The conical shape of these trees does not allow snow to get deposited on them. Examples: pine, deodar, cedar, spruce and fir.
→ Plants of plains: Most of the plants on plains have many branches. Examples: peepal, banyan, mango, sal, sheesham, etc.
→ Plants of hot and wet regions: Plants in hot and wet regions usually have a large number of leaves. They do no shed their leaves in any particular season. So, they are called evergreen trees.
→ Plants of marshy areas: Mangroves grow in marshy soil. These plants develop aerial roots which come out above the water level. The aerial roots take oxygen from air. So, they are also called breathing roots.
→ Plants of desert areas: Plants in deserts have well developed roots which go very deep in the ground. Cactus is a desert plant. The stem of cactus looks like leaves and is soft and fleshy. Cactus stores water in its stem. The leaves of cactus have turned into spines.
→ Aquatic Plants: Plants which grow in water are called aquatic plants. There are two main types of aquatic plants:
- Floating Aquatic Plants: The floating aquatic plants are of two types:
- Free floating plants: These plants are not attached to any surface. Their leaves have air filled cavities. This helps these plants in floating on water. Examples: water lettuce, water hyacinth, duckweed, etc.
- Fixed aquatic plants: These plants are fixed to the bottom with their roots. Stems of these plants are very long and have holes in them. Leaves are very broad in these plants. Examples: lotus and water lily. Lotus stem (kamal kakri) is eaten as vegetable.
- Underwater Plants: Underwater plants have ribbon like leaves. Example: Hydrilla.
→ Cultivation of Plants: When a plant is grown by human beings for any use, it is called cultivated plant. Human beings grow rice, wheat, maize, cotton, etc. on large scale.
→ Weeds: Unwanted plants which grow in a farm are called weeds. Weeds consume water and fertilizers meant for the crop. Thus, weeds are harmful for crops.
→ Steps in cultivation of crop:
- Ploughing: In this step, soil is dug and loosened so that it becomes soft. Ploughing is done by plough and also by tractor.
- Sowing: After ploughing, seeds are sprinkled on field. This process is called sowing.
- Irrigation: Supplying water to crops is called irrigation. Every crop needs water on a regular basis.
- Weeding: Removal of weeds is called weeding.
- Harvesting: Cutting of mature crops is called harvesting.