Q. No.With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct?
1.
Light saturation for CO2-fixation occurs at 10% of full sunlight.
2.
Increasing atmospheric CO2 concentration upto 0.05% can enhance the CO2-fixation rate
3.
C3 plants respond to higher temperature with enhanced photosynthesis, while C4 plants have a much lower temperature optimum.
4.
Tomato is a greenhouse crop, which can be grown in a CO2-enriched atmosphere for higher yield.
Water vapour comes out from the plant leaf through the stomatal opening. Through the same stomatal opening carbon dioxide diffuses into the plant during photosynthesis. Reason out the above statements using the following options.
| 1. | Both process can happen together because the diffusion coefficient of water and CO2 is different. |
| 2. | The above processes happen only during night time |
| 3. | One process occurs during the day time and the other night |
| 4. | Both processes cannot happen simultaneously |
A plant in your garden avoids photorespiratory losses, has improved water use efficiency, shows high rates of photosynthesis at high temperatures and has improved efficiency of nitrogen utilization. In which of the following physiological groups would you assign this plant?
(1) C4
(2) CAM
(3) Nitrogen-fixer
(4) C3
Emerson's enhancement effect and red drop have been instrumental in the discovery of
1. two photosystems operating simultaneously
2. photophosphorylation and cyclic electron transport.
3. Oxidative phosphorylation
4. photophosphorylation and non-cyclic electron transport
In a chloroplast the highest number of protons are found in
1. lumen of thylakoids
2. inter membrane space
3. antenna complex
4. Stroma
In photosynthesis, the light-independent reactions take place at
1. thylakoid lumen
2. photosystem l
3. photosystem ll
4. stromal matrix
Anoxygenic photosynthesis is characteristic of
1. Rhodospirillum
2. Spirogyra
3. Chlamydomonas
4. Ulva
The correct sequence of cell organelles during photorespiration is
(1) chloroplast-Golgi bodies-mitochondria
(2) chloroplast-rough endoplasmic reticulum-dictyosomes
(3) chloroplast-peroxisome-mitochondria
(4) chloroplast-vacuole-peroxisome
PGA as the first CO2 fixation was discovered in the photosynthesis of
(1) bryophyte
(2) gymnosperm
(3) angiosperm
(4) algae
C4 -plants are more efficient in photosynthesis than C3 -plants due to
| 1. | higher leaf area |
| 2. | presence of larger number of chloroplasts in the leaf cells. |
| 3. | presence of thin cuticle |
| 4. | lower rate of photorespiration |
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