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Q. No.Which phase of a sigmoid curve explains the initial phase of growth when growth rate is very slow?
1. Log phase
2. Lag phase
3. stationary phase
4. Maturation phase
76%
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__________ curve is obtained for cells in culture.
1. J-shaped
2. Linear
3. V-shaped
4. S-shaped
1. J-shaped
2. Linear
3. V-shaped
4. S-shaped
70%
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A Leaf of 20 cm2 grows 5 cm2 per hour and B Leaf of 25 cm2 grows 5 cm2 per hour
The relative growth rate of leaf A and B respectively is
1. 25% and 20%
2. 20% and 25%
3. 50% and 100%
4. 25% and 50%
The relative growth rate of leaf A and B respectively is
1. 25% and 20%
2. 20% and 25%
3. 50% and 100%
4. 25% and 50%
66%
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What happens to the growth of roots during water logging conditions?
1. Growth is accelerated
2. Growth is inhibited
3. Growth remains constant
4. First growth is accelerated and then stops
1. Growth is accelerated
2. Growth is inhibited
3. Growth remains constant
4. First growth is accelerated and then stops
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Which of the following is not a function of water in plants?
1. It is responsible for cell elongation
2. It maintains the turgidity of cells
3. It acts as a source of energy
4. It provides medium for enzymatic activities
1. It is responsible for cell elongation
2. It maintains the turgidity of cells
3. It acts as a source of energy
4. It provides medium for enzymatic activities
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Which abiotic factor is not essential for early growth of the plant but growth is sustained only in its presence?
1. Water
2. Oxygen
1. Water
2. Oxygen
3. Nutrients
4. Light
4. Light
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Which factor determines the direction of movement of main root and stem?
1. Oxygen
2. Gravity
3. Temperature
4. Nutrients
1. Oxygen
2. Gravity
3. Temperature
4. Nutrients
Subtopic: Growth |
69%
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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
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 |
58%
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