The photoautotrophic organisms that do not split water to obtain reducing power are
| 1. | purple bacteria |
| 2. | cyanobacteria |
| 3. | green plants |
| 4. | none of these |
Which one of the following categories of organisms do not evolve oxygen during photosynthesis?
| 1. | Red algae |
| 2. | Photosynthetic bacteria |
| 3. | C4 plants with Kranz anatomy |
| 4. | Blue green algae |
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.
Match the Columns.
|
Column I (Scientists) |
Column II (Discoveries) |
|
A. Stephen Hales |
1. Importance of light and chlorophyll |
|
B. Ingen Housz |
2. Presence of chlorophyll in plants. |
|
C. Von Mohl |
3. Product of photosynthesis is starch. |
|
D. Sach |
4. Air and light control plant growth. |
Code
|
|
A |
B |
C |
D |
|
(1) |
4 |
1 |
2 |
3 |
|
(2) |
3 |
2 |
1 |
4 |
|
(3) |
2 |
3 |
4 |
1 |
|
(4) |
4 |
3 |
2 |
1 |
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?
| 1. | Light | 2. | Chlorophyll |
| 3. | CO2 | 4. | O2 |
| Column I (Scientist) | Column II (Contribution) | ||
| i. | Jan Ingenhousz | a. | Discovery of oxygen (O₂) |
| ii. | Joseph Priestley | b. | Plants restore to the air whatever breathing animals and burning candles remove |
| iii. | T.W. Engelmann | 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. | Used a prism to split light into its spectral components and then illuminated Cladophora placed in a suspension of aerobic bacteria |
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
Cornelius van Niel, who, based on his studies demonstrated that photosynthesis is essentially a light-dependent reaction performed his experiments on-
1. Cladophora
2. purple and green bacteria
3. green algae
4. Non sulphur bacteria
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. |
| 1. | Green sulphur bacteria | 2. | Nostoc |
| 3. | Cycas | 4. | Chara |
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