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Q. No.Which two distinct microbial processes are responsible for the release of fixed nitrogen as dinitrogen gas (N2) to the atmosphere?
1.
Aerobic nitrate oxidation, and nitrite reduction
2.
Decomposition of organic nitrogen, and conversion of dinitrogen to ammonium compounds
3.
Enteric fermentation in cattle, and nitrogen fixation by Rhizobium in root nodules of legumes
4.
Anaerobic ammonium oxidation, and denitrification
Subtopic: Nitrogen Fixation | Nitrogen Metabolism |
51%
Level 3: 35%-60%
NEET - 2013
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Assertion(A): Elements like calcium are not easily released or are immobile.
Reason(R): They are a part of the structural components of a cell.
Choices for Assertions and reasons:
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.
Reason(R): They are a part of the structural components of a cell.
Choices for Assertions and reasons:
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.
Subtopic: Mineral Deficiency & Toxicity |
74%
Level 2: 60%+
Hints
Assertion(A): In the absence of any particular element, plants show certain morphological changes.
Reason(R): Each element has at least one specific structural or functional role in plants.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.
Reason(R): Each element has at least one specific structural or functional role in plants.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.
Subtopic: Mineral Deficiency & Toxicity |
72%
Level 2: 60%+
Hints
Assertion(A): The minerals useful for plants are derived from rock minerals.
Reason(R): The role of minerals in plant nutrition is referred to as mineral nutrition.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.
Reason(R): The role of minerals in plant nutrition is referred to as mineral nutrition.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.
Subtopic: SOIL AS RESERVOIR OF ESSENTIAL ELEMENTS |
59%
Level 3: 35%-60%
Hints
Assertion(A): There is often a need for supplying essential minerals through fertilizers.
Reason(R): The deficiency of essential minerals may not affect the crop yield.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.
Reason(R): The deficiency of essential minerals may not affect the crop yield.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.
Subtopic: SOIL AS RESERVOIR OF ESSENTIAL ELEMENTS |
80%
Level 1: 80%+
Hints
Assertion(A): Aspartate and glutamate aren't the transport form of nitrogen in xylem vessels.
Reason(R): These amino acids have more nitrogen than amides.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.
Reason(R): These amino acids have more nitrogen than amides.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.
Subtopic: Nitrogen Fixation |
54%
Level 3: 35%-60%
Hints
Assertion(A): Excess of manganese induces a deficiency of iron, magnesium, and sulfur.
Reason(R): Manganese inhibits calcium translocation in the shoot apex.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.
Reason(R): Manganese inhibits calcium translocation in the shoot apex.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.
Subtopic: Mineral Deficiency & Toxicity |
64%
Level 2: 60%+
Hints
All the following elements required by higher plants are regarded as ‘beneficial’ except:
1. Sodium
2. Selenium
3. Cobalt
4. Nickel
1. Sodium
2. Selenium
3. Cobalt
4. Nickel
Subtopic: Criteria for Essentiality of Elements |
67%
Level 2: 60%+
Please attempt this question first.
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Ammonia synthesis by nitrogenase requires a very high input of energy which is:
| 1. | 4 ATP for each NH3 produced |
| 2. | 8 ATP for each NH3 produced |
| 3. | 12 ATP for each NH3 produced |
| 4. | 16 ATP for each NH3 produced |
Subtopic: Nodule formation |
85%
Level 1: 80%+
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Match each item in COLUMN I with one in Column II and select the correct match from the codes given:
Codes:
| Column I [Element] |
Column II [Role in plants] |
||
| A | Magnesium | P | Synthesis of auxin |
| B | Manganese | Q | Ribosome structure |
| C | Boron | R | Pollen germination |
| D | Zinc | S | Splitting of water |
| A | B | C | D | |
| 1. | Q | R | P | S |
| 2. | S | R | Q | P |
| 3. | Q | S | R | P |
| 4. | R | S | P | Q |
Subtopic: Mineral Function |
83%
Level 1: 80%+
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