The correct and complete equation for the process of photosynthesis in higher plants will be:
1.
6CO2 + 12H2O + light energy → C6H12O6 + 6O2+ 6H2O
2.
6CO2 + 6H2O + light energy → C6H12O6 + 6O2
3.
CO2 + H2O + light energy → [CH2O] + O2
4.
C6H12O6 + 6O2 → 6CO2 + 6H2O
Subtopic: Historical View: Experiments |
86%
Level 1: 80%+
Hints
In the chloroplast:
| Statement I: | The membrane system is the site of enzymatic reactions leading to synthesis of sugar. |
| Statement II: | The stroma is responsible for trapping the light energy and also for the synthesis of ATP and NADPH. |
| 1. | Both Statement I and Statement II are correct |
| 2. | Both Statement I and Statement II are incorrect |
| 3. | Statement I is correct but Statement II is incorrect |
| 4. | Statement I is incorrect but Statement II is correct |
Subtopic: Chloroplast Structure |
61%
Level 2: 60%+
Hints
Consider the given two statements:
| I: | Carbon reactions during photosynthesis in higher plants are called as dark reactions. |
| II: | They occur in darkness and they are not light-dependent. |
| 1. | Both I and II are correct and II explains I |
| 2. | Both I and II are correct but II does not explain I |
| 3. | I is correct but II is incorrect |
| 4. | I is incorrect but II is correct |
Subtopic: Dark Reaction: Biosynthetic Phase | Dark Reaction : Calvin Cycle |
80%
Level 1: 80%+
Hints
The accessory pigments of photosynthesis:
1. Only I and II are correct
2. Only I and III are correct
3. I, II and III are correct
4. Only II and III are correct
| I: | include Carotenoids and Xanthophylls but not Chlorophyll b. |
| II: | enable a wider range of wavelength of incoming light to be utilised for photosynthesis. |
| III: | protect Chlorophyll a from photo-oxidation. |
1. Only I and II are correct
2. Only I and III are correct
3. I, II and III are correct
4. Only II and III are correct
Subtopic: Pigments |
88%
Level 1: 80%+
Hints
The ‘light reaction’ of photosynthesis in higher plants does not include:
| 1. | Light absorption |
| 2. | Water splitting and oxygen release |
| 3. | Formation of ATP and NADPH |
| 4. | Fixation of carbon |
Subtopic: Dark Reaction: Biosynthetic Phase | Light Reactions |
90%
Level 1: 80%+
Hints
Match each item in Column-I with one in Column-II and select the correct match from the codes given:
Codes
| Column-I | Column-II | ||
| A. | Chlorophyll a | P. | Bright or blue-green |
| B. | Chlorophyll b | Q. | Yellow-green |
| C. | Xanthophylls | R. | Yellow |
| D. | Carotenoids | S. | Yellow to yellow-orange |
| A | B | C | D | |
| 1. | P | Q | R | S |
| 2. | Q | R | S | P |
| 3. | R | S | P | Q |
| 4. | S | P | Q | R |
Subtopic: Pigments |
93%
Level 1: 80%+
Hints
In the Z-scheme, transfer of electrons starts from:
| 1. | the PS II uphill to the acceptor, down the electron transport chain to PS I, transferred to another acceptor after excitation, and finally downhill to NADP+ reducing it to NADPH + H+. |
| 2. | the PS II downhill to the acceptor, down the electron transport chain to PS I, transferred to another acceptor after excitation, and finally uphill to NADP+ reducing it to NADPH + H+. |
| 3. | the PS I uphill to the acceptor, down the electron transport chain to PS II, transferred to another acceptor after excitation, and finally downhill to NADP+ reducing it to NADPH + H+. |
| 4. | the PS I downhill to the acceptor, down the electron transport chain to PS II, transferred to another acceptor after excitation, and finally uphill to NADP+ reducing it to NADPH + H+. |
Subtopic: Light Reaction: Electron Transport |
82%
Level 1: 80%+
Hints
The splitting of water during oxygenic photosynthesis in higher plants:
| I: | is associated with PS II |
| II: | releases one molecule of oxygen on splitting of two water molecules |
| III: | releases protons and oxygen in the thylakoid lumen |
| 1. | Only I and II are correct |
| 2. | Only I and III are correct |
| 3. | Only II and III are correct |
| 4. | I, II and III are correct |
Subtopic: Light Reactions |
75%
Level 2: 60%+
Hints
Consider the given two statements:
| Statement I: | When only PS I is functional, the electron is circulated within the photosystem and the phosphorylation occurs due to cyclic flow of electrons. |
| Statement II: | Cyclic photophosphorylation also occurs when only light of wavelengths beyond 680 nm are available for excitation. |
| 1. | Both Statement I and Statement II are correct |
| 2. | Both Statement I and Statement II are incorrect |
| 3. | Statement I is correct but Statement II is incorrect |
| 4. | Statement I is incorrect but Statement II is correct |
Subtopic: Light Reaction: Electron Transport |
80%
Level 1: 80%+
Hints
Regarding the thylakoid membrane:
| I: | Plastoquinone is located within the membrane |
| II: | Plastocyanin is located on the inner lumen side of the membrane |
| III: | NADP reductase is located on the stroma side of the membrane |
| 1. | Only I and II are correct |
| 2. | Only I and III are correct |
| 3. | Only II and III are correct |
| 4. | I, II and III are correct |
Subtopic: Chemiosmotic hypothesis |
64%
Level 2: 60%+
Hints
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