Factors Affecting Photosynthesis

Q.

What is the function of chlorophyll?

Q. If we keep on increasing CO² concentration in the air what will be the rate of photosynthesis?

Q.

3 factors necessary for photosynthesis to take place are:

1. Presence of sunlight
2. Presence of chlorophyll
3. Presence of water and carbon-dioxide

1. False

2. True

Q. Why do plants produce carbon dioxide as a waste product during night time

Q.

The rate of photosynthesis is maximum in which light?

Q.

What is the importance of respiration in plants?

Q.

Which graph shows the effect of temperature on the rate of photosynthesis?

1. 

2. 

3. 

4. 

Q.

Photosynthesis takes place fastest in which color light- blue, yellow , red, green or white(sunlight)?

Q.

The raw material responsible for the release of oxygen in photosynthesis is

Q.

Mention four factors which are essential for photosynthesis? [2 MARKS]

Q. Photorespiration is also known as
i. $C_2$ cycle
ii. PCR cycle
iii. HSK pathway
iv. PCO cycle

1. i and ii

2. i and iv
3. ii and iii
4. iii and iv

Q.

Name any four external factors which influence the process of photosynthesis.

Q. (a) Name the two phase of photosynthesis.
(b) What is the role of light in this process?
(c) Describe any three adaptations in a green leaf for photosynthesis.

Q. Increase in light intensity increases photosynthesis initially and then stabilises. Now if concentration increases, photosynthesis also increases.

1. hydrogen
2. carbon dioxide
3. hydrogen
4. nitrogen

Q. Pitcher plants feed on insects to meet their _________ requirements.

1. nitrogen
2. phosphorus
3. sulphur
4. potassium

Q.

Which colour regions of the light spectrum are most efficient in photosynthesis?

1. green, yellow, & orange

2. infrared, red, & yellow

3. red, white& blue

4. red, violet&blue

Q.

Question 25

Read the features of plants given below.

(a) Thick waxy stem

(b) Short roots

(c) Cone-shaped plants

(d) Sloping branches

(e) Small or spine-like leaves

(f) Hollow stem

Choose the type of plant for every adaptive feature given in a, b, c, d, e and f from the list given below:

Aquatic plant, desert plant, mountainous plant

Q. Photosynthesis can take place efficiently even in the absence of chlorophyll and sunlight.

1. False
2. True

Q. Photosynthesis is more active in
(a) green light
(b) red light
(c) yellow light
(d) violet light

Q.

The rate of photosynthesis is NOT affected by.

(a) light intensity (b) humidity

(c) temperature (d) $C{O}_2$ concentration

Q.

Which process maintains a balance between the level of carbon dioxide and oxygen in the atmosphere?

1. Photosynthesis & respiration

2. Photosynthesis & combustion

3. Respiration & combustion

4. Combustion & galvanisation

Q. Which among the factors are necessary for photosynthesis to occur?

1. Chlorophyll
2. Protoplasm
3. Sunlight
4. All of the above

Q. (a) What is photosynthesis?
(b) Write a chemical equation to show the process of photosynthesis in plants.
(c) Explain the mechanism of photosynthesis.

Q. The internal cellular energy reserve in autotrophs is

1. Glycogen
2. Fatty acid
3. Starch
4. Protein

Q.

Explain bioluminescence.

Q.

Question 28
Choose the event that does not occur in photosynthesis

(a) Absorption of light energy by chlorophyll
(b) Reduction of carbon dioxide to carbohydrates
(c) Oxidation of carbon to carbon dioxide
(d) Conversion of light energy to chemical energy

Q.

Which color in visible light does chlorophyll absorb the maximum?

Q. Which of the following events does not occur in photosynthesis?
(a) conversion of light energy into chemical energy
(b) reduction of carbon dioxide to carbohydrates
(c) oxidation of carbon to carbon dioxide
(d) absorption of light energy by chlorophyll

Q. Name the pigment which can absorb solar energy.

Q. State the factors necessary for photosynthesis to occur.