Q. No.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
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.
An action spectrum of photosynthesis was first described by:
1. Jan Ingenhousz
2. Julius von Sachs
3. T.W. Engelmann
4. Cornelius van Niel
Match the scientists in Column I with their contributions in Column II:
| 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 |
| 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 | |
| iv. Julius von Sachs | d. Discovery of production of glucose in plants |
Choose the option with the correct matching:
a. i → c; ii → b; iii → a, e, f; iv → d
b. i → a, b; ii → c; iii → d; iv → e, f
c. i → a; ii → b; iii → c, e; iv → f
d. i → c; ii → a, b; iii → e, f; iv → d
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