Q. No.
Which of the following statements does not justify the importance of photosynthesis?
| 1. | it is the primary source of all food on earth. |
| 2. | it is responsible for the release of oxygen into the atmosphere. |
| 3. | it is responsible for the water balance on earth. |
| 4. | use of energy from sunlight by plants doing photosynthesis is the basis of life on earth. |
Photosynthesis is a-
a. Biochemical process
b. Physical process
c. Chemical process
d. Physico-chemical process
Blackman's law is related to
(1) respiration
(2) transpiration
(3) root pressure
(4) photosynthesis.
Which of the following statement is correct?
| 1. | H2S is the hydrogen donor for purple and green sulphur bacteria. |
| 2. | H2O is the hydrogen donor for purple and green sulphur bacteria. |
| 3. | Oxygen is evolved by the purple and green sulphur bacteria. |
| 4. | Oxygen evolved by the green plants comes from CO2. |
One scientist cultured Cladophora in a suspension of Azotobacter and illuminated the culture by splitting light through a prism. He observed that bacteria accumulated mainly in the region of:
| 1. | Violet and green light |
| 2. | Indigo and green light |
| 3. | Orange and yellow light |
| 4. | Blue and red light |
Choose the incorrect statement regarding early experiments on photosynthesis
| 1. | Priestley experiment revealed the essential role of air in the growth of a green plant |
| 2. | Ingenhousz showed that sunlight is essential to the plant processes |
| 3. | It is green parts of the plants that can release oxygen |
| 4. | Von Sachs provided evidence for production of carbon dioxide when plants grow |
Sunlight is essential for photosynthesis is established
by
1. Jan Ingenhousz
2. Robert Hill
3. Emerson
4. Julius Von Sach
| Column – I | Column - II | ||
| i. | Jan Ingenhousz | a. | discovery of O2 |
| ii. | Joseph Priestley | b. | Plants restore to the air whatever breathing animals and burning candles remove |
| iii. | T.W Englemann | c. | showed that only the green part of the plants could release oxygen |
| iv. | Julius von Sachs | d. | discovery of production of glucose in plants |
| e. | first action spectrum of photosynthesis | ||
| f. | Using a prism he split light into its spectral components and then illuminated Cladophora, placed in a suspension of aerobic bacteria. |
Which of the following shows the correct match?
| 1. | i-c; ii-b; iii-a, e, f; iv-d |
| 2. | i-a, b; ii-c; iii-d; iv- e, f. |
| 3. | i-a; ii- b; iii- c, e; iv-f. |
| 4. | i-c, ii-a,b; iii-e, f; iv-d; |
The half-leaf experiment, where a part of the leaf is enclosed in a test tube containing some KOH soaked cotton was performed, which showed that _________ was required for photosynthesis?
a. Light
b. Chlorophyll
c. CO2
d. O2
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