The sigmoid growth and arithmetic growth can be represented graphically, respectively, as:
1.
2.
3.
4.
Subtopic: Â Growth Model |
 91%
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Observe the sigmoid curve given below and identify the phases A, B, and C:
| 1. | A = Initial slow growth, B = Rapid growth, C = Phase of growth during limited nutrient supply |
| 2. | A = Rapid growth, B = Initial slow growth, C = Phase of growth during limited nutrient supply |
| 3. | A = Lag phase, B = Stationary phase, C = Exponential phase |
| 4. | A = Exponential phase, B = Stationary phase, C = Lag phase |
Subtopic: Â Growth Model |
 84%
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Which of the following is incorrect?
| 1. | Conversion of shoot apical meristem into cortex is a case of differentiation |
| 2. | The non-living differentiated cells can regain the capacity of division which is called dedifferentiation |
| 3. | The formation of interfascicular cambium and cork cambium can occur from the fully differentiated parenchyma |
| 4. | Secondary xylem and phellem are the products of dedifferentiation |
Subtopic: Â Differentiation, Dedifferentiation and Redifferentiation |
From NCERT
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The phenomenon of heterophily:
| 1. | Is found in cotton, coriander, larkspur and buttercup |
| 2. | Is an example of platicity |
| 3. | Occurs as a result of development or in response to environment |
| 4. | All are correct |
Subtopic: Â Development |
 94%
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The intrinsic factor influencing the development in plants is:
| 1. | \(O_2\) |
| 2. | \(H_2O\) |
| 3. | \(CO_2\) and nutrition |
| 4. | Plant growth regulators |
Subtopic: Â Growth Hormones & Auxin |
 94%
From NCERT
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Match the columns:
| Column I | Column II | ||
| A. | Adenine derivative | (i) | Ethylene |
| B. | Terpenes | (ii) | Kinetin |
| C. | Gaseous hormone | (iii) | GA |
| D. | Caroteinoid derivative | (iv) | ABA |
| 1. | A = (i) , B =(ii) , C = (iii) , D= (iv) |
| 2. | A = (iv) , B =(iii) , C = (i) , D= (ii) |
| 3. | A = (ii) , B =(iii) , C = (iv) , D= (i) |
| 4. | A = (ii) , B =(iii) , C = (i) , D= (iv) |
Subtopic: Â Growth Hormones & Auxin |
 84%
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Charles Darwin and his son Francis Darwin found that coleoptile tip of a plant responded to unilateral light by growing towards the light source (photoperiodism). They worked with plant?
1. Phalaris (Canary grass)
2. Avena (Oat)
3. Saccharum
4. Triticale
1. Phalaris (Canary grass)
2. Avena (Oat)
3. Saccharum
4. Triticale
Subtopic: Â Growth Hormones & Auxin |
 78%
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Subtopic: Â Abscisic Acid |
 96%
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Subtopic: Â Growth Hormones & Auxin |Â Ethylene |
 85%
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Which of the following conclusions is supported by the research of both Went and Charles Darwin on shoot responses to light?
| 1. | When shoots are exposed to light, a chemical substance migrates towards the light. |
| 2. | Agar contains a chemical substance that mimics a plant hormone. |
| 3. | A chemical substance involved in shoot bending is produced in the shoot tips. |
| 4. | Once the shoot tip is cut, normal growth cannot be induced. |
Subtopic: Â Growth Hormones & Auxin |
 66%
From NCERT
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