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Q. No.Which factor determines the direction of movement of main root and stem?
1. Oxygen
2. Gravity
3. Temperature
4. Nutrients
Subtopic: Growth |
72%
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Examples of lateral meristems are
1. Phellogen and collenchyma
2. Vascular cambium and phellem
3. Vascular cambium and cork cambium
4. Xylem and cork cambium
1. Phellogen and collenchyma
2. Vascular cambium and phellem
3. Vascular cambium and cork cambium
4. Xylem and cork cambium
Subtopic: Growth |
86%
From NCERT
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Tracheids do not collapse under extreme tension due to the presence of
| 1. | Strong, elastic lignocellulosic secondary cell wall |
| 2. | Thick, cellulosic primary cell wall |
| 3. | Thin, elastic, cellulosic primary cell wall |
| 4. | Thick, hard suberised secondary cell wall |
Subtopic: Growth | Differentiation, Dedifferentiation and Redifferentiation |
71%
From NCERT
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Cork, secondary cortex and secondary xylem are formed through
1. Dedifferentiation
2. Redifferentiation
3. Differentiation
4. Obliteration
2. Redifferentiation
3. Differentiation
4. Obliteration
Subtopic: Growth |
61%
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Which of the following is formed after differentiation?
1. Secondary phloem
2. Secondary cortex
3. Parenchyma
4. Interfascicular vascular cambium
1. Secondary phloem
2. Secondary cortex
3. Parenchyma
4. Interfascicular vascular cambium
Subtopic: Growth |
54%
From NCERT
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The ability of a plant to follow different pathways and produce different structures in response to environment is known as
1. Heterophylly
2. Plasticity
3. Efficiency index
4. Vernalisation
1. Heterophylly
2. Plasticity
3. Efficiency index
4. Vernalisation
Subtopic: Development |
90%
From NCERT
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Heterophylly means
| 1. | The appearance of different forms of leaves on the same plant species |
| 2. | The appearance of same form of leaves on different plants |
| 3. | The appearance of same form of flowers on different plants |
| 4. | The appearance of different forms of fruits on the same plant |
Subtopic: Development |
86%
From NCERT
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Plant growth regulators (PGRs) are
| 1. | Simple organic substances of different chemical composition |
| 2. | Complex organic substances of different chemical composition |
| 3. | Simple and complex organic substances of same chemical composition |
| 4. | Small organic substances of same chemical composition |
Subtopic: Growth Hormones & Auxin |
74%
From NCERT
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Which type of phytohormone is made up of indole compounds?
1. Zeatin
2. ABA
3. Auxin
4. Gibberellins
1. Zeatin
2. ABA
3. Auxin
4. Gibberellins
Subtopic: Growth Hormones & Auxin |
90%
From NCERT
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Subtopic: Growth Hormones & Auxin |
88%
From NCERT
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