Photosynthesis

Q. Plants absorb carbon dioxide from the air through tiny pores called stomata.

1. False
2. True

Q.

In Fig. 17.15, the artist has forgotten to put the labels and directions on the arrows. Mark the directions on the arrows and label the diagram using the following labels:​

clouds, rain, atmosphere, carbon dioxide, oxygen, plants, animals, soil, roots, water table.

Q. What are soaps?

Q.

Out of the following, pick the gases used by plants - nitrogen, oxygen, carbon dioxide, sulphur dioxide, nitric oxide.
Also mention the use. [2 MARKS]

Q.

During photosynthesis, oxygen is produced by ___ and carbon dioxide is utilized for ___.

1. water, energy production

2. photolysis of water, trapping solar energy

3. photolysis of water, carbohydrate formation

4. carbohydrate formation, energy release

Q. State whether the following statements are true of false:

Statement 1: Plants help to purify air by taking in carbon dioxide.
Statement 2: Carbon dioxide is used in photosynthesis during daytime.

1. Statement 1: True
   Statement 2: False
2. Statement 1: True
   Statement 2: True
3. Statement 1: False
   Statement 2: True
4. Statement 1: False
   Statement 2: False

Q. Soap solution turns red litmus paper blue. True or false?

1. True
2. False

Q. Complete the photosynthesis reaction:
+ Water $\stackrel{Sunlight,Chlorophyll}{\to }$ + Oxygen

1. Carbon dioxide
2. Hydrogen
3. Carbohydrate
4. Fat

Q. How are soaps manufactured? (3 marks)

Q. A diagrammatic representation of the process of photosynthesis is given below. Identify the correct representation of the chemical reaction involved in this process.

Q.

82. The component of air used by the green plants which make their food is:

Q.

____ are called the food factories of the plants.

1. Roots

2. Leaves

3. Fruits

4. Flowers

Q. Choose the correct statement with respect to photosynthesis.

1. Roots are the organs of transpiration
2. Water is not neccessary for photosynthesis process
3. Carbon dioxide is produced during photosynthesis
4. Exchange of gases takes place through stomata

Q. The slow process of conversion of dead vegetation into coal is called ___.

Q. Plants absorb carbon dioxide from the air through tiny pores called stomata.

1. True
2. False

Q. Which of these options contains processes involving change of state from LIQUID to GAS?

1. Evaporation and sublimation
2. Evaporation and respiration
3. Respiration and transpiration
4. Evaporation and transpiration