DAV Class 6 Science Chapter 8 Question Answer – Structure and Function of the Living Organisms: Plants

The DAV Class 6 Science Book Solutions and DAV Class 6 Science Chapter 8 Question Answer – Structure and Function of the Living Organisms: Plants are essential study tools for DAV public school students in Class 6.

DAV Class 6 Science Ch 8 Question Answer – Structure and Function of the Living Organisms: Plants

DAV Class 6 Science Ch 8 Solutions – Structure and Function of the Living Organisms: Plants

Something To Know

A. Fill in the blanks.

Question 1.
Maize, wheat and rice are the examples of ______ roots.
Answer:
Fibrous

Question 2.
Ginger and potato are two examples of modified ______
Answer:
Stem

Question 3.
The main function of the ______ is to prepare food for the plant.
Answer:
Leaf

Question 4.
Banyan is an example of ______ roots.
Answer:
Prop

Question 5.
______ is the most attractive and colourful part of the plant.
Answer:
Flower

Question 6.
The leaves of cacti are modified into ______
Answer:
Spines

Question 7.
The leaf blade is also known as ______
Answer:
Lamina

B. Write True or False for the following statements.

1. All plants possess tap root system.
2. The wheat and maize plants have fibrous root system.
3. Cactus plants photosynthesise through its stems.
4. Leaves manufacture food for themselves.
5. Flower is meant for the reproduction of the plant.
6. The pistil is the female part of a flower.
7. Stigma and ovary have no role in reproduction of plants.
8. Seeds store food for the future plant.
Answer:
1. All plants possess tap root system. (False)
2. The wheat and maize plants have fibrous root system. (True)
3. Cactus plants photosynthesise through its stems. (True)
4. Leaves manufacture food for themselves. (False)
5. Flower is meant for the reproduction of the plant. (True)
6. The pistil is the female part of a flower. (True)
7. Stigma and ovary have no role in reproduction of plants. (True)
8. Seeds store food for the future plant. (False)

C. Tick (✓) the correct option.

1. The roots, that are consumed as food, are
(a) Onion and sweet potato
(b) Carrot and onion
(c) Beet and turnip
(d) Potato and radish
Answer:
(c) Beet and turnip

2. The plants manufacture food through the process of
(a) Transpiration
(b) Water conduction
(c) Photosynthesis
(d) Respiration
Answer:
(c) Photosynthesis

3. Leaves are attached to the stem at the
(a) Nodes
(b) Pedicel
(c) Internode
(d) Stalk
Answer:
(a) Nodes

4. The total number of whorls, in a flower, is/are
(a) One
(b) Two
(c) Three
(d) Four
Answer:
(d) Four

5. The reproductive organ, of a plant, is the
(a) Flower
(b) Leaf
(c) Seed
(d) Root
Answer:
(a) Flower

6. The part of the flower, that provides protection to the bud, before it blooms, is the
(a) Sepal
(b) Petals
(c) Stamen
(d) Pistil
Answer:
(a) Sepal

D. Answer the following questions in brief.

Question 1.
Name the two main systems of a plant.
Answer:
Root system and Shoot system

Question 2.
Name the different parts of the shoot system.
Answer:
Stem, leaves and flowers

Question 3.
Name different types of modified stems.
Answer:
Different types of modified stems are as follows:
(a) Modification for food storage
(b) Modification for support
(c) Modification for manufacturing food.

Question 4.
State the role of spines the modified leaves.
Answer:
The modified leaves, in the form of spines, protect the plants from grazing animals.

Question 5.
Name the different parts of a flower.
Answer:
Different parts of a flower are as follows:
(a) Sepals
(b) Petals
(c) Stamens
(d) Pistil

Question 6.
Give the meaning of the term ‘pollination’.
Answer:
Transfer of pollen grains from anthers to stigma is called pollination.

E. Answer the following questions.

Question 1.
State the differences between the two main systems of a plant.
Answer:

Root System	Shoot System
Is composed of roots.	Is composed of stem, leaves and flowers.
Grows under the ground.	Grows above the ground.
Takes water and minerals from soil.	Makes food and provides support.

Question 2.
Define root system. Give two functions of roots.
Answer:
The part of the plant which grows below the ground and is composed of roots is called the root system.
Two functions of roots are as follows:
(a) Roots provide anchorage to the plant.
(b) Roots absorb water and minerals from soil.

Question 3.
Define shoot system. Give two functions of the stem.
Answer:
The part of the plant which grows above the ground and is composed of stem, leaves, flowers, fruits and seeds is called the shoot system. Two functions of stem are as follows:

1. Stem keeps the plant straight and upright.
2. Stem transports water and minerals (absorbed by roots) to all plant parts.

Question 4.
How is tap root different from fibrous root? Give one example for each type.
Answer:

Tap Root	Fibrous Root
A single root grows from the base of stem.	Several roots grow from the base of stem.
The main root gives rise to many lateral roots.	Roots do not have branches.
Example: Pea	Example: Wheat

Question 5.
What is a leaf? Draw a diagram showing various parts of a leaf.
A leaf is a broad, flat and green structure in plant. A leaf grows from the node of the stem. The flat and broad part of the leaf is called leaf blade or lamina. Leaf is attached to the stem by a short structure called petiole. The petiole continues through the lamina or a mid-rib. The mid-rib branches out into a fine network of veins. Veins transport water, minerals and food in plants. They also provide support to the leaf.

Question 6.
Name any two types of stem modifications giving one example for each type. Two types of stem modifications are as follows:
Answer:
(a) Stem modification for food storage: Example: Ginger
(b) Stem modification for photosynthesis: Example: Cactus

Question 7.
Name the two parts of a stamen. State the functions of each of these two parts. Two parts of a stamen and their functions are as follows:
Anther: Bears pollen grains.
Filament: Provides support to the anther.

Question 8.
What are the functions of a fruit?
Answer:
Functions of a fruit:
(a) Fruit protects the seed against injury and other unfavourable climatic conditions.
(b) Fruit helps in dispersal of seeds.
(c) Fruit stores food, e.g. in tomato, apple, mango, etc.

Value Based Question

It was the occasion of the ‘Farewell Day’ of Class XII students. The principal wished them well and advised them to try becoming similar to the stem of the plants, for the elders and seniors in the family.

Question 1.
State the values that the principal wanted to convey to the students.
Answer:
Virtue of providing strength and support to someone.

Question 2.
State any two of the functions that the stem performs during the life and growth of a plant.
Answer:
Two functions of stem:

• It provides support to various organs of the shoot system.
• It supplies water and minerals to leaves.

Question 3.
Plan a ‘play’ in which different students play roles similar to the different functions of the stem/roots of a plant.

Something To Do

Question 1.
Describe an experiment to show that water is transported by the root, through the stem, to all parts of the plant.
Answer:
Take a twig and a bowl. Fill the bowl with coloured water and keep the twig in that; with the lower end in water. Keep it for about 2 – 3 days. After a few days, you will observe that the stem and the leaves have become coloured. We can conclude from this observation that water is transported through stem to all parts of the plant.

Question 2.
Draw a neat and well-labelled diagram of the structure of a flower.
Answer:

Question 3.
Take a potato. Examine it carefully. Look at the nodes and internodes present on it. In which category of the plant part would you place it?
Answer:
Do it yourself.

Question 4.
Soak a few seeds of gram in water for a few days. Take them out and gently split them into two halves. Observe the position of the baby plant.
Answer:
Do it yourself.

Question 5.
Visit your school garden. Get permission to collect a few flowers and observe them carefully. Count the number of sepals, petals, anthers and pistils. Split the anther and observe the pollen grains. Similarly, split open the ovary and see the ovules present in it.
Answer:
Do it yourself.

DAV Class 6 Science Chapter 8 Solutions – Structure and Function of the Living Organisms: Plants

I. Fill in the blanks.

Question 1.
There is a single main root in the ______ root system.
Answer:
Tap

Question 2.
There are many roots which come from the base of the stem in ______ roots system.
Answer:
Fibrous

Question 3.
Carrot shows modification of root for ______
Answer:
Food storage

Question 4.
______  roots of banyan provide extra support to the tree.
Answer:
Prop

Question 5.
Stem usually grows ______ the ground.
Answer:
Above

Question 6.
Root usually grows ______ the ground.
Answer:
Below

Question 7.
Ginger shows modification of ______ for food storage.
Answer:
Stem

Question 8.
Leaf is the main site of ______ in plants.
Answer:
Photosynthesis

Question 9.
The outermost whorl of a flower is called ______
Answer:
Calyx

Question 10.
Corolla is composed of ______
Answer:
Petals

Question 11.
Anther produces ______
Answer:
Pollen grains

II. Tick (✓) the correct option.

1. Which of these plants have tap root system?
(a) Wheat
(b) Rice
(c) Bean
(d) Grass
Answer:
(c) Bean

2. Which of these plants have fibrous root system?
(a) Pea
(b) Gram
(c) Mango
(d) Sugar cane
Answer:
(d) Sugarcane

3. Radish is an example of modification of which plant part?
(a) Root
(b) Stem
(c) Leaf
(d) Flower
Answer:
(a) Root

4. Potato is an example of modification of which plant part?
(a) Root
(b) Stem
(c) Leaf
(d) Flower
Answer:
(d) Flower

5. Leaf of which of these plants can produce a new plant?
(a) Mango
(b) Grass
(c) Wheat
(d) Bryophyllum
Answer:
(d) Bryophyllum

6. What is the colour of sepals in most of the plants?
(a) Green
(b) Red
(c) Yellow
(d) Any colour
Answer:
(a) Green

7. Which is the male reproductive part in a flower?
(a) Sepal
(b) Petal
(c) Anther
(d) Pistil
Answer:
(c) Anther

8. Which is the female reproductive part in a flower?
(a) Sepal
(b) Petal
(c) Anther
(d) Pistil
Answer:
(d) Pistil

9. Fruit is developed from which flower part?
(a) Sepal
(b) Corolla
(c) Ovary
(d) Stem
Answer:
(c) Ovary

III. Answer these questions.

Question 1.
What are the various functions of root?
Answer:
Functions of roots:
(а) Root absorbs water and minerals from soil.
(b) Root holds the plant into the soil.
(c) In some plants, root also stores food.
(d) Roots bind the soil together and thus prevent the soil from getting washed away by rains or blown away by winds.

Question 2.
What do you understand by tap root system?
Answer:
On germination of seed, a single root grows downwards. It branches into smaller lateral roots. This type of root system is called rap root system. Examples: pea, mustard, bean, gram, etc.

Question 3.
What do you understand by fibrous root system?
Answer:
On germination of seed, several roots grow at the same time. This type of root system is called fibrous root system. Examples: maize, wheat, rice, grasses, etc.

Question 4.
Explain the modification of root for food storage.
Answer:
In some plants, roots are modified for food storage. Roots in such plants are swollen because of the stored food. Examples: carrot, sweet potato, turnip, beetroot, etc.

Question 5.
What is stem? Explain the structure of stem.
Answer:
Stem is the main part of the shoot system and it usually grows above the ground. The stem bears leaves at regular intervals. The point from which a leaf comes out is called the node of the stem. The part between two nodes is called internode.

Question 6.
What are the various functions of stem?
Answer:
Functions of stem:
(a) Stem keeps the plant straight and upright.
(b) Stem transports water and minerals (absorbed by roots) to all plant parts.
(c) Stem transports food (prepared by leaves) to other plant parts.
(d) Stem holds the leaves in such a way that they get the optimum sunlight so that they can perform photosynthesis.
(e) In some plants, stem also stores food.
(f) Green stem of young plants also perform photosynthesis.

Question 7.
What are the various functions of leaf?
Answer:
Functions of leaf:
(a) Leaf is the main site of photosynthesis. Thus, leaf is the place where food is manufactured in plants.
(b) Leaf helps in exchange of gases through small pores called stomata.

Question 8.
What are the functions of flower?
Answer:
Functions of flower:
(a) Flower is the reproductive organ of a plant. It grows into a fruit and produces seeds.
(b) Flowers have great economic importance. Many ornamental flowers are grown in gardens and parks.
(c) Flowers are important source of perfumes and scents.
(d) Some flowers are dried and used as spices, e.g. cloves and saffron.

IV. Projects

Question 1.
Collect a flower of China Rose. Keep it between sheets of a newspaper and let it dry in the sun. Make a herbarium, once it dries.
Answer:
Do it yourself.

Question 2.
Make a diagram of a flowering plant and label the main parts of the flower.
Answer:
Make the diagram and label root, stem, leaf, flower and fruit.

Question 3.
Make a list of different vegetables and write the name of plant parts which are edible in these plants.
Answer:
Do it yourself.