How Do Plants Make Their Food Test 2

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How Do Plants Make Their Food Test 2

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following is used to test the presence of starch?

A
Iodine solution

B
Copper sulphate solution

C
Potassium hydroxide

D
Alcohol

Solution

Starch turns blue black when iodine solution is added to it.
Question 2
1 / -0

Chlorophyll is a green pigment found in leaves. It is important to the green plants because it

A
helps the plant in reproduction.

B
traps nitrogen in the air.

C
traps light energy from the sun.

D
absorbs water and mineral salts.

Solution

Chlorophyll is a green pigment present in leaves. It helps to trap light energy from the sun.
Question 3
1 / -0

Where does most of the water needed for photosynthesis come from?

A
From air through the tiny pores in the leaf.

B
From the soil through the roots of the plant.

C
As a result of respiration within the leaf.

D
From water vapour in the air.

Solution

Roots absorb water from soil. The stem conducts water to all parts of the plants and leaves through vessels. This water is used by the leaves to synthesise food during photosynthesis.
Question 4
1 / -0

Harish wants to test the presence of starch in a leaf. Given below are the in striations to conduct the experiment. Which of the following step is NOT necessary?

A
Boil the leaf first in water and then in alcohol.

B
Wash the bleached leaf.

C
Add a few drops of iodine solution to the bleached leave.

D
Heat the leaf on a hot flame.

Solution

To test the presence of starch in a leaf, the leaf should be boiled and not to burn.
Question 5
1 / -0

During photosynthesis, plants absorb ________ gas and release _______gas.

A
carbon dioxide, oxygen

B
oxygen, carbon dioxide

C
oxygen, nitrogen

D
nitrogen, oxygen

Solution

During photosynthesis, plants use carbon dioxide and give out oxygen.
Question 6
1 / -0

Abhi covered a leaf of a potted plant and kept the plant under sunlight for a few days and then tested it with iodine solution for the presence of starch in it. The colour of the covered leaf did not turn blue-black. What does this indicate?

A
The black cover absorbed all the starch present in the leaf.

B
Iodine solution does not work with black covers.

C
Starch is evaporated from the leaves.

D
Starch is prepared only in the presence of sunlight.

Solution

Sunlight is essential for plants to synthesize its food.
Question 7
1 / -0

When iodine is added to a starch solution, the color is changed to

A
blue black.

B
yellow

C
green

D
reddish brown.

Solution

The appearance of blue black colour, when iodine is added to starch is an indication of or test to show the presence of starch.
Question 8
1 / -0

Leaves are green due to the presence of a green pigment called chlorophyll. The main function of chlorophyll is

A
to absorb carbon dioxide from the atmosphere.

B
to absorb water and minerals from the soil.

C
to breathe.

D
to perform photosynthesis in the presence of sunlight.

Solution

Chlorophyll pigment is useful in performing photosynthesis in the presence of sunlight.
Question 9
1 / -0

Which of the following are called food factories of the plant?

A
Leaves

B
Stem

C
Roots

D
Flowers

Solution

Leaves are called the food factories of the plant.
Question 10
1 / -0

Plants store extra food in the form of

A
oxygen

B
carbon dioxide.

C
chlorophyll

D
starch

Solution

Plants store extra food in the form of starch.

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How Do Plants Make Their Food Test 2

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How Do Plants Make Their Food Test 2

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Question 1

Iodine solution

Copper sulphate solution

Potassium hydroxide

Alcohol

Solution

Question 2

helps the plant in reproduction.

traps nitrogen in the air.

traps light energy from the sun.

absorbs water and mineral salts.

Solution

Question 3

From air through the tiny pores in the leaf.

From the soil through the roots of the plant.

As a result of respiration within the leaf.

From water vapour in the air.

Solution

Question 4

Boil the leaf first in water and then in alcohol.

Wash the bleached leaf.

Add a few drops of iodine solution to the bleached leave.

Heat the leaf on a hot flame.

Solution

Question 5

carbon dioxide, oxygen

oxygen, carbon dioxide

oxygen, nitrogen

nitrogen, oxygen

Solution

Question 6

The black cover absorbed all the starch present in the leaf.

Iodine solution does not work with black covers.

Starch is evaporated from the leaves.

Starch is prepared only in the presence of sunlight.

Solution

Question 7

blue black.

yellow

green

reddish brown.

Solution

Question 8

to absorb carbon dioxide from the atmosphere.

to absorb water and minerals from the soil.

to breathe.

to perform photosynthesis in the presence of sunlight.

Solution

Question 9

Leaves

Stem

Roots

Flowers

Solution

Question 10

oxygen

carbon dioxide.

chlorophyll

starch

Solution

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