During Meiosis 1, in which stage synapsis takes place?
1.
Pachytene
2.
Zygotene
3.
Diplotene
4.
Leptotene
Subtopic: Cell Cycle: Meiosis I |
83%
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NEET - 2020
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Match the following events that occur in their respective phases of cell cycle and select the correct option:
| Column I | Column II | ||
| (a) | G1 phase | (i) | Cell grows and organelle duplication |
| (b) | S phase | (ii) | DNA replication and chromosome duplication |
| (c) | G2 phase | (iii) | Cytoplasmic growth |
| (d) | Metaphase in M-phase | (iv) | Alignment of chromosomes |
| Options: | (a) | (b) | (c) | (d) |
| 1. | (ii) | (iii) | (iv) | (i) |
| 2. | (iii) | (iv) | (i) | (ii) |
| 3. | (iv) | (i) | (ii) | (iii) |
| 4. | (iii) | (ii) | (i) | (iv) |
Subtopic: Intro to Cell Cycle & Interphase |
87%
From NCERT
NEET - 2020
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What happens to the mass number and the atomic number of an element when it emits \(\gamma\text{-}\)radiation?
| 1. | mass number decreases by four and atomic number decreases by two. |
| 2. | mass number and atomic number remain unchanged. |
| 3. | mass number remains unchanged while the atomic number decreases by one. |
| 4. | mass number increases by four and the atomic number increases by two. |
Subtopic: Types of Decay |
83%
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NEET - 2020
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Select the incorrect statement.
| 1. | Transport of molecules in phloem can be bidirectional. |
| 2. | The movement of minerals in the xylem is unidirectional. |
| 3. | Unloading of sucrose at the sink does not involve the utilization of ATP. |
| 4. | Elements most easily mobilized in plants from one region to another are phosphorus, sulfur, nitrogen, and potassium. |
Subtopic: The Pressure Flow or Mass Flow Hypothesis |
81%
From NCERT
NEET - 2020
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In Glycine max, the product of biological nitrogen fixation is transported from the root nodules to other parts as:
1. Ammonia
2. Glutamate
3. Nitrates
4. Ureides
Subtopic: Ammonia Assimilation & Nitrogen Export |
54%
From NCERT
NEET - 2020
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Which of the following elements helps in maintaining the structure of ribosomes?
1. Magnesium
2. Zinc
3. Copper
4. Molybdenum
Subtopic: Mineral Function |
83%
From NCERT
NEET - 2020
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During non-cyclic photophosphorylation, when electrons are lost from the reaction center at PS II, what is the source which replaces these electrons?
| 1. | Oxygen | 2. | Water |
| 3. | Carbon dioxide | 4. | Light |
Subtopic: Light Reaction: Photophosphorylation |
82%
From NCERT
NEET - 2020
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Which of the following statements is incorrect?
| 1. | RuBisCO is a bifunctional enzyme |
| 2. | In C4 plants, the site of RuBisCO activity is mesophyll cell |
| 3. | The substrate molecule for RuBisCO activity is a 5-carbon compound |
| 4. | RuBisCO action requires ATP and NADPH |
Subtopic: C4 Cycle (Hatch & Slack Pathway) |
78%
From NCERT
NEET - 2020
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Pyruvate dehydrogenase activity during aerobic respiration requires:
1. Calcium
2. Iron
3. Cobalt
4. Magnesium
Subtopic: Aerobic Respiration |
82%
From NCERT
NEET - 2020
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Subtopic: Growth Hormones & Auxin |
84%
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NEET - 2020
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