Photosynthesis

Q. Prove with the help of an experiment that carbon dioxide is necessary for photosynthesis. [5 MARKS]

Q.

Amarbel is an example of

1. Autotroph

2. Parasite

3. Saprotroph

4. Host

Q. _____ are called the 'kitchen of the plant'.

1. Seeds
2. Leaves
3. Fruits
4. Flowers

Q.

Some plants with deep red, violet or brown leaves also carry out the process of photosynthesis

Justify the statement

Q. Is chlorophyll necessary for photosynthesis? How do we prove it with an experiment? [5 MARKS]

Q.

Observe the picture below. The variegated leaves are used to determine the role of chlorophyll in photosynthesis. After adding Iodine solution, only green part of leaf show positive result. The possible reason for this is:

1. Iodine cannot diffuse into non-green parts of leaf.

2. Starch production takes place in green parts only.

3. Starch production takes place in non-green plants.

4. Iodine has more affinity towards towards green patches.

Q.

Why do stomata close at night?

Q.

How can we decolorize a leaf? What will you conclude when white patches do not turn blue-black on adding iodine solution?

Q.

Explain the role of sunlight, chlorophyll, temperature and carbon dioxide in photosynthesis.

Q. In which part of the plant does most of the photosynthesis occur?

1. Seed
2. Stem
3. Leaf
4. Root

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.

Iodine is used to test the presence of starch.

1. True

2. False

Q.

Photolysis is the process of splitting of water molecules in the presence of grana and temperature.

1. True
2. False

Q.

Animals depend on plants for

1. Food alone

2. Shelter alone

3. Carbon dioxide

4. Food and oxygen

Q.

How do non-green plants make their own food

Q. During photosynthesis, plants absorb carbon dioxide from the air through stomata.

1. True
2. False

Q.

During Photosynthesis, oxygen is produced by ……………………and carbon dioxide is utilised for …………………

1. water; energy production

2. carbohydrate formation, energy release

3. photolysis of water; trapping solar energy

4. photolysis of water; carbohydrate formation

Q. If a leaf has undergone photosynthesis, what would be the result of the starch test on this leaf?

1. The whole leaf would turn purple-yellow in colour.
2. The whole leaf would turn dark green in colour.
3. The whole leaf would turn brown in colour.
4. The whole leaf would turn blue-black in colour.

Q.

What happens to the unused carbohydrates produced in the plant body?

1. Eliminated through excretion.

2. More energy is produced to enhance growth.

3. Stored in the form of starch for future use.

4. Transported to stems in the form of glycogen.

Q.

CO₂ + H₂O → C₆H₁₂O₆ + O₂ + H₂O

Is the given equation correct? If not, correct it.

1. yes

2. No, 6CO₂ + 12H₂O → C₆H₁₂O₆ + 6O₂ + 6H₂O

3. No, 6CO₂ + H₂O → C₆H₁₂O₆ +6O₂ + H₂O

4. None of the above

Q.

How are stomata blocked?

Q.

The chemical substance used to test the presence of starch in the cell of a leaf is ________.

Q. Assertion (A): Plants help to purify air by taking in carbon dioxide.

Reason (R): Carbon dioxide is used in photosynthesis during daytime

1. A is true and R is false.
2. A is false and R is true.
3. Both A and R are true and R is the correct explanation for A.
4. A and R both are true but R is not the correct explanation for A.

Q. In order to carry out photosynthesis, what are the substances that a plant must take in ? Also mention their sources.​

Q.

What is Autotrophic Nutrition? Which organisms are called Autotrophs? Give examples.

Q.

State whether the following statements are true or false. If false, write the correct form of the statement by changing the first or last word only.

Photosynthesis occurs in all the cells of the plant.

1. True
2. False

Q. Which gas is released at the end of photosynthesis?

1. Carbon dioxide
2. Nitrogen
3. Hydrogen
4. Oxygen

Q.

The dark reaction of photosynthesis is known as __________.

Q.

How would you test the presence of starch in leaves?

Q. Plants perform photosynthesis in the absence of sunlight.

1. True
2. False