Which one of the following is not true regarding the release of energy during ATP synthesis through chemiosmosis?
It involves :
It involves :
| 1. | Reduction of NADP to NADPH2 on the stroma side of the membrane |
| 2. | Breakdown of proton gradient |
| 3. | Breakdown of electron gradient |
| 4. | Movement of protons across the membrane to the stroma |
 65%
Level 2: 60%+
Hints
Identify the incorrect statement related to Pollination:
| 1. | Moths and butterflies are the most dominant pollinating agents among insects |
| 2. | Pollination by water is quite rare in flowering plants |
| 3. | Pollination by wind is more common amongst abiotic pollination |
| 4. | Flowers produce foul odours to attract flies and beetles to get pollinated |
Subtopic: Â Pollination & Outbreeding Devices |
 70%
Level 2: 60%+
Hints
The appearance of recombination nodules on homologous chromosomes during meiosis characterizes:
| 1. | Terminalization | 2. | Synaptonemal complex |
| 3. | Bivalent | 4. | Sites at which crossing over occurs |
Subtopic: Â Cell Cycle: Meiosis I |
 74%
Level 2: 60%+
Hints
The gaseous plant growth regulator is used in plants to:
| 1. | kill dicotyledonous weeds in the fields |
| 2. | speed up the malting process |
| 3. | promote root growth and root hair formation to increase the absorption surface |
| 4. | help overcome apical dominance |
Subtopic: Â Ethylene |
 74%
Level 2: 60%+
Hints
What is the net gain of ATP when each molecule of glucose is converted to two molecules of pyruvic acid?
| 1. | Eight | 2. | Four |
| 3. | Six | 4. | Two |
Subtopic: Â Glycolysis |
 64%
Level 2: 60%+
Hints
Identify the correct set of statements:
| (a) | The leaflets are modified into pointed hard thorns in Citrus and Bougainvillea |
| (b) | Axillary buds form slender and spirally coiled tendrils in cucumber and pumpkin |
| (c) | Stem is flattened and fleshy in Opuntia and modified to perform the function of leaves |
| (d) | Rhizophora shows vertically upward growing roots that help to get oxygen for respiration |
| (e) | Subaerially growing stems in grasses and strawberry help in vegetative propagation |
Choose the correct answer from the options given below:
| 1. | (a), (b), (d) and (e) only | 2. | (b), (c) only |
| 3. | (a), (d) only | 4. | (b), (c), (d) and (e) only |
Subtopic: Â Modifications of Stem |
 62%
Level 2: 60%+
Hints
The process of translation of mRNA to proteins begins as soon as:
| 1. | The tRNA is activated and the larger subunit of ribosome encounters mRNA |
| 2. | The small subunit of ribosome encounters mRNA |
| 3. | The larger subunit of ribosome encounters mRNA |
| 4. | Both the subunits join together to bind with mRNA |
Subtopic: Â Translation |
 55%
Level 3: 35%-60%
Hints
In old trees the greater part of secondary xylem is dark brown and resistant to insect attack due to :
| (a) | secretion of secondary metabolites and their deposition in the lumen of vessels. |
| (b) | deposition of organic compounds like tannins and resins in the central layers of stem. |
| (c) | deposition of suberin and aromatic substances in the outer layer of stem. |
| (d) | deposition of tannins, gum, resin and aromatic substances in the peripheral layers of stem. |
| (e) | presence of parenchyma cells, functionally active xylem elements and essential oils. |
Choose the correct answer from the options given below
| 1. | (b) and (d) Only | 2. | (a) and (b) Only |
| 3. | (c) and (d) Only | 4. | (d) and (e) Only |
 60%
Level 2: 60%+
Hints
Which of the following is not observed during apoplastic pathway?
| 1. | Apoplast is continuous and does not provide any barrier to water movement. |
| 2. | Movement of water occurs through intercellular spaces and wall of the cells. |
| 3. | The movement does not involve crossing of cell membrane |
| 4. | The movement is aided by cytoplasmic streaming |
 61%
Level 2: 60%+
Hints
Production of Cucumber has increased manifold in recent years. Application of which of the following phytohormones has resulted in this increased yield as the hormone is known to produce female flowers in the plants:
| 1. | Cytokinin | 2. | ABA |
| 3. | Gibberellin | 4. | Ethylene |
Subtopic: Â Ethylene |
 69%
Level 2: 60%+
Hints
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