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Q. No.The site of perception of light in plants during photoperiodism is:
1. Axillary bud
2. Leaf
3. Shoot apex
4. Stem
74%
From NCERT
NEET - 2021
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Plants follow different pathways in response to environment or phases of life to form different kinds of structures. This ability is called:
| 1. | Plasticity | 2. | Maturity |
| 3. | Elasticity | 4. | Flexibility |
Subtopic: Development |
91%
From NCERT
NEET - 2021
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Subtopic: Auxin Function |
89%
From NCERT
NEET - 2021
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Promotion of flowering process in a plant by exposure to the prolonged cold of winter, or by an artificial equivalent, is called as:
1. Stratification
2. Vernalisation
3. Photoperiodism
4. Scarification
1. Stratification
2. Vernalisation
3. Photoperiodism
4. Scarification
87%
From NCERT
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Which PGR promotes flowering in pineapples, induces parthenocarpy in tomatoes and also used as herbicides?
| 1. | Auxins | 2. | Cytokinins |
| 3. | Gibberellins | 4. | Ethylene |
Subtopic: Growth Hormones & Auxin |
89%
From NCERT
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PGRs can be broadly divided into two groups – plant growth promoters and plant growth inhibitors. Ethylene:
| 1. | belongs to the group of plant growth promoters |
| 2. | belongs to the group of plant growth inhibitors |
| 3. | could fit either of the groups, but is largely an inhibitor of growth activities |
| 4. | could fit either of the groups, but is largely a promoter of growth activities |
Subtopic: Growth Hormones & Auxin |
79%
From NCERT
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Different types of leaves in different phases of life in cotton, coriander and larkspur are an example of:
1. Pleiotropy
2. Phenotypic plasticity
3. Developmental noise
4. Polygenic trait
1. Pleiotropy
2. Phenotypic plasticity
3. Developmental noise
4. Polygenic trait
Subtopic: Development |
90%
From NCERT
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In the exponential growth equation Nt =N0ert, e represents :
1. The base of natural logarithms
2. The base of geometric logarithms
3. The base of number logarithms
4. The base of exponential logarithms
Subtopic: Growth | Growth Model |
70%
From NCERT
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The increased growth per unit time is termed as growth rate. The exponential growth can be mathematically expressed as:
1. Lt = L0 +rt
2. Lt = L0 rt
3. W1 = W0ert
4. W1 = W0 + ert
1. Lt = L0 +rt
2. Lt = L0 rt
3. W1 = W0ert
4. W1 = W0 + ert
Subtopic: Growth | Growth Model |
75%
From NCERT
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Match each item in Column I with the one given in Column II and select the correct match from the codes given:
Codes:
| Column I | Column II | ||
| A. | Auxins | P. | Terpenes |
| B. | Gibberellins | Q. | Derivatives of carotenoids |
| C. | Cytokinins | R. | Adenine derivative |
| D. | Abscisic acid | S. | Indole compounds |
| A | B | C | D | |
| 1. | S | P | R | Q |
| 2. | P | Q | S | R |
| 3. | Q | R | P | S |
| 4. | R | S | Q | P |
Subtopic: Growth Hormones & Auxin |
93%
From NCERT
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