Plants | Term 2 Chapter 3 | 3rd Science - Questions with Answers

Plants

Term 2 Chapter 3 | 3rd Science

Text Book Back Exercises: Questions with Answers, Solutions, and Evaluation

EVALUATION

I. Choose the correct answer.

1. The function of leaf is to

(a) Give Support
(b) Fix the plant firmly
(c) Produce food
(d) None of the above

Answer : (c) Produce food

2. An example for taproot is___________

(a) Paddy
(b) Grass
(c) Mango
(d) Ragi

Answer : (c) Mango

3. ___________ supports the plant.

(a) Root
(b) Leaf
(c) Flower
(d) Stem

Answer : (d) Stem

4. Most plants grow from the___________

(a) root
(b) leaf
(c) flower
(d) seed

Answer : (d) seed

5. Roots are poorly developed in_________

(a) agaya thamarai
(b) neem
(c) teak
(d) date palm

Answer : (a) agaya thamarai

6. If part X will be absent in a plant, new plants will not be produced. X is ____

(a) stem
(b) root
(c) flower
(d) leaves

Answer : (c) flower

7. The plant is adapted to grow in deserts as it has_______

(a) fleshy stem
(b) needle like roots
(c) leaves changed to spine
(d) both a and c

Answer : (c) leaves changed to spine

8. An example of many seeded fruit is________

(a) pomegranate
(b) mango
(c) apricot
(d) peach

Answer : (a) pomegranate

9. Which of the following plant parts take part in absorption of water and exchange of gases respectively?

(a) P and R
(b) R and S
(c) S and Q
(d) T and P

Answer : (d) T and P

II. Find the odd one.

1. Carrot, Radish, Tomato, Beetroot

2. Cabbage, Greens, Turmeric, Spinach

3. Neem, Aloe vera, Datepalm, Opuntia

4. Coconut, Mango, Apricot, Orange

5. Hydrilla, Opuntia, Water hyacinth, Vallisneria

III. Short answers.

1. Name the parts of a plant.

Root, stem, leaf, flower, fruit and seed are the parts of a plant.

2. Name the types of roots.

Tap root and Fibrous root.

3. Write any two functions of the leaves.

(i) Leaf prepares food for the plant.
(ii) It gives cooling effect to the plant by transpiration.

4. Write the parts of a flower.

(i) Petal
(ii) Sepal
(iii) Stamen
(iv) Pistil

5. Name the types of plants based on their habitat.

(i) Desert plants
(ii) Coastal plants
(iii) Mountain plants
(iv) Aquatic plants
(v) Plains plants

6. Write any two adaptations of desert plants.

(i) Leaves are changed into spines.
(ii) The stem is green and fleshy.

7. Write the names of some water plants.

Water hyacinth, Pistia, Lotus, Water lily

IV. Answer the following questions.

1. Write any two functions of each:

(a) Stem

(i) Supports the whole plant,
(ii) Transports food from leaf and water from root.

(b) Root

(i) Fixes the plant firmly to the soil
(ii) Absorbs water and minerals from the soil.

(c) Flower

(i) Develops into fruit
(ii) Helps plant to reproduce.

2. Why is leaf called food factory of the plant?

Leaf prepares food for the plant with the help of water, carbon dioxide sunlight, and chlorophyll. Hence it is called the food factory of the plant.

3. Differentiate between taproot and fibrous root.

Taproot:
(i) Thick main root that goes deep into the soil.
(ii) Side roots are developed from the main root.

Fibrous root:
(i) No main root and the roots do not go deep into the soil.
(ii) Roots are developed from the base of the stem.

4. Give two examples of:

(a) Fruit having only one seed

Mango, Coconut

(b) Fruit having many seeds

Papaya, orange

5. Name two free floating plants.

(i) Water hyacinth.
(ii) Pistia.

6. Look at the picture of a water lily.

(a) Which parts of the plant can you see?

We can see the flowers and the leaves, at the surface.

(b) Where are the plant‛s roots and stem?

The plant's roots and stem are in the mud under the water.

V. Project

Collect the information about vegetables that were cooked in your friends houses for the last two days. Fill the table with the particulars.

From the table, answer the following questions.

(a) In how many houses did they cook leafy vegetables?

one

(b) Which vegetable is cooked the most?

Cauliflower

Warm-up

Unscramble the words and label the parts of the plant.

( ETSM, TORO, ELFA, FURTI, LOFEWR , SDEE )

Let us Do

Take two small potted plants. Cut the root of one of the plants and fix it in the pot. Now water the plants for two to three days. You will observe that the plant without roots will wilt and die. In the absence of roots, plants die.

This activity proves that the function of the roots is to absorb Water and Minerals from the soil.

Let us Write

True or false

1. The roots grow into the soil. (True)

2. Fibrous root has a main root. (False)

3. Root absorbs water from soil. (True)

4. Potato stores food in its root. (False)

5. Grass has fibrous roots. (True)

Which method is easier to identify? Touching or smelling?

Answer : smelling

Let us Do

Collect the leaves of different kinds of plants.

1. Arrange the leaves from small to big.
2. Group the leaves based on its colour.

Let us Write

Fill in the blanks.

1. Stem grows towards the sunlight.

2. Leaves originate from the Stem.

3. Green part of the plant that makes food is called Leaf.

4. Stem gives support to the whole plant.

5. Water from soil is absorbed by the root of the plant.

Think and Write

1. List out the fruits that do not have seeds.
Banana, pineapple.

2. Write down the names of the fruit trees that you have never seen, but have tasted their fruits.
apple, strawberry.

Let us Do

Connect the leaf with its fruit.

Let us Connect

Match the plants with their living places.

Let us Try

A. Select the ‘INCORRECT‛ statement from the following.

1. Desert plants grow in hot, dry and sandy places.

2. Plants in coastal areas tolerant to saline water.

3. Mountain plants have needle like leaves.

4. Teak is an example of desert plant. (Incorrect)

B. Tick (√) the odd one.

1. Teak, Tamarind, Mango, Opuntia ✔

2. Opuntia, Aloe vera, Pine ✔, Date palm

C. Circle/underline the places which are land habitats.

Forest, Pond, Mountain, River

Tree, Ocean, Desert, Cave

Let us Try

A. Mark ‘L” for land plants and ‘W‛ for water plants.

B. Colour the Water hyacinth plant.

C. Write true or false.

1. Fixed rooted plants are present in water bodies. (False)

2. Leaves of lotus are submerged in the water. (False)

3. Lotus plants are found in many ponds. (True)

4. Water hyacinth freely float with the help of spongy body filled with air. (True)