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.
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
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
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 incorrect?
| 1. | Oxygen is released from water. |
| 2. | Photosynthesis is a single step reaction. |
| 3. | Action spectrum of photosynthesis resembles roughly the absorption spectra of chlorophyll a and b. |
| 4. | In plants glucose is stored as starch. |
Where does photosynthesis takes place?
a. in green leaves
b. in green parts of plant
c. in leaves
d. in complete plant
The _____________ in the leaves have a large number of_________, which align themselves along the walls of the ____________, such that they get the __________quantity of the incident light.
| 1. | chloroplasts, chlorophyll, chloroplasts, optimum. |
| 2. | mesophyll cells, chlorophyll, mesophyll cells, optimum. |
| 3. | mesophyll cells, chloroplasts, mesophyll cells, optimum. |
| 4. | mesophyll cells, chloroplasts, mesophyll cells, minimum. |
Identify i, ii, iii and iv labellings in the following diagram :
| i | ii | iii | iv | |
| 1. | stroma lamella | thylakoid | stroma | genetic material |
| 2. | stroma lamella | grana | stroma | starch granule |
| 3. | grana | lamella | stroma | starch granule |
| 4. | stroma lamella | grana | cytoplasm | starch granule |
| Column I | Column II |
| i. grana | a. dark reaction |
| ii. Stroma | b. light reaction |
| c. synthesis of ATP and NADPH+H+ | |
| d. synthesis of sugar |
| 1. | i-b, c; ii-a, d. |
| 2. | i-a, d; ii-b, c. |
| 3. | i-b, d; ii-a,c. |
| 4. | i-b; ii-a, c, d. |
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