Factors Affecting Photosynthesis

Q.

Photosynthesis is maximum in

1. Green light

2. Blue followed by red

3. Red followed by blue

4. Blue light

Q.

Which color of light is mostly absorbed by chlorophyll A?

1. Blue.

2. Green.

3. Yellow.

4. Infrared.

Q.

The process common to both aerobic and anaerobic organisms is

1. Glyoxylate cycle

2. TCA cycle

3. Glycolysis

4. Krebs cycle

Q.

Insectivorous plants are usually adapted to

1. Soil deficient in sugars

2. Soil rich in trace elements

3. Water-rich soil

4. Soil deficient in nitrogenous compounds

Q.

Does photosynthesis affect transpiration?

Q.

Which of the following are products of the light reactions of photosynthesis that are utilized in the Calvin cycle?

1. CO2 and glucose

2. H2O and O2

3. ATP and NADPH

4. ADP, Pi, and NADP+

Q.

Reduction of oxygen which forms water occurs during

1. both photosynthesis and respiration

2. photosynthesis

3. respiration

4. neither photosynthesis nor respiration.

Q.

Which one of the following plant is LDP?

1. Tobacco

2. Wheat

3. Soybean

4. Xanthium

Q. Rate of photosynthesis increases with an increase in the intensity of light.

1. True
2. False

Q. Which of the following equation sums up photosynthetic reaction most accurately

1. $CO+H_{2}O\to C{H}_{2}O+O_2$
   
2. $6C{O}_2+6H_{2}O\to C_6{H}_{12}{O}_6+6O_2$
   
3. $6C{O}_2+12H_{2}O\underset{chlorophyll}{\overset{light}{\to }}{C}_6{H}_{12}{O}_6+6O_2+6H_{2}O$
   
4. $6C{O}_2+12H_{2}O\to C_6{H}_{12}{O}_6+6H_{2}O$

Q. A student sets up an experiment on photosynthesis as follow: He takes soda water in a glass tumbler and add a chlorophyll extracts into the contents and keeps the tumbler exposed sunlight hoping that he has provided necessary ingredient for photosynthesis to proceed (viz, $C{O}_2,H_{2}O$, chlorophyll and light)
What do you think what will happen after, say few hours of exposure of light?

1. Photosynthesis will take place and glucose will produced
2. Photosynthesis will take place and starch will be produced which will turn the mixture turbid
3. Photosynthesis will not take place because $C{O}_2$ dissolved in soda water escapes into the atmosphere
4. Photosynthesis will not take place because intact chloroplasts are needed for the process

Q. Carbon dioxide is necessary for photosynthesis. The chemical used to remove this gas most effectively from entering a control apparatus is

1. Calcium oxide
   
   
2. Distilled water
   
3. Potassium hydroxide solution
   
4. Sodium carbonate.
   

Q. Which of the following functions does not support the statement “transpiration and photosynthesis is a compromise”?

1. Water is transported to the leaves for photosynthesis and excess water is lost by transpiration.
2. Water is lost in the form of water vapor by transpiration and cools the surface of the leaf which is useful for photosynthesis.
3. Transpiration helps in transporting minerals to all parts of the plant which are also useful in photosynthesis.
4. Transpiration results in water loss for the plants and photosynthesis results in providing food to the different parts of the plant

Q.

Figure shows the effect of light on the rate of photosynthesis. Based on the graph, answer the following questions:

(a) At which point/s (A, B or C) in the curve is light a limiting factor?

(b) What could be the limiting factor/s in region A?

(c) What do C and D represent on the curve?

Q. What is Hill reaction and where does it occurs ?

Q. Which of the following is an internal factor that influences photosynthesis?

1. Temperature
2. Availability of sunlight
3. Availability of water
4. Amount of chlorophyll

Q. When the level of $C{O}_2$ used in photosynthesis is equal to the amount of $C{O}_2$ released by respiration and photorespiration it is called ___________.

1. extinction point
2. $C{O}_2$ saturation point
3. $C{O}_2$ compensation point
4. $C{O}_2$ fixation

Q.

Figure 13.10 shows the effect of light on the rate of photosynthesis. Based on the graph, answer the following questions:

(a) At which point/s (A, B or C) in the curve is light a limiting factor?

(b) What could be the limiting factor/s in region A?

(c) What do C and D represent on the curve?

Q.

what is meant by photo-oxidation.How does accessory pigments protect chlorophyll a from photo oxidation?

Q. Which of the following can photosynthesize at low temperatures?

1. Bacteria
2. Lichen
3. Virus
4. Fungi

Q. What is the optimum temperature required for $C_3$ plants?

1. $30-{40}^{\circ }C$
2. $20-{25}^{\circ }C$
3. Above ${40}^{\circ }C$
4. Above ${25}^{\circ }C$

Q. Which of the following is a major limiting factor for photosynthesis in $C_3$ plants?

1. Water
2. Carbon dioxide
3. Sunlight
4. Humidity

Q.

In photosynthesis, the most useful colors of the light spectrum are

1. green, yellow & orange.

2. red, violet & blue.

3. infrared, red & yellow.

4. red, white & blue.

Q. Assertion: Plants utilize 5-10% of the absorbed water in photosynthesis.
Reason: Reduced leaf hydration decreases the photosynthesis.

1. Both reason and assertion are true and the reason is the correct explanation for the assertion.
2. Both the reason and assertion are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but the reason is false
4. Both the assertion and reason are false

Q. Look at leaves of the same plant on the shady side and compare it with the leaves on the sunny side or compare the potted plants kept in the sunlight with those in the shade. Which of them has leaves that are darker green? Why?

Q. Which of the following adversely affects photosynthesis?

1. U.V light
2. Blue light
3. Red light
4. Green light

Q.

What are the assumptions made during the calculation of net gain of ATP?