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Class 10
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Study of Phototropism and Geotropism in Plants
Study of Phototropism and Geotropism in Plants
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1)
The tendency of roots to move away from the source of light is which type of phototropism.
Positive geotropism
Negative geotropism
Positive phototropism
Negative phototropism
2)
Which hormone promotes cell elongation by promoting water intake and increasing cell elasticity
Gibberellins
Cytokinin
Abscisic acid
Auxin
3)
The process in which the root grows toward gravity is known as
Negative phototropism
Positive phototropism
Positive geotropism
None of these
4)
An apparatus commonly used to demonstrate phototropism is
Arc Auxanometer
Clinostat
Potometer
Heliotropic chamber
5)
Negative phototropism occurs in which part of a plant
Flower
Root
Leaf
Stem
6)
Phototropism of stem and root are due to
Differential hormonal effect
Epinasty and hyponasty
Graviperception
Effect of light
7)
If the stem grows towards sunlight and root grows just opposite to it, the stem movement is known as
Negative phototropic movement
Positive geotropic movement
Phototropic movement
Positive phototropic movement
8)
What are the factors that modify geotropic responses in plants?
Root and shoot apices, humidity and temperature
Root and shoot apices, phytochrome, humidity and temperature
None of these
Root and shoot apices, temperature, light and atmospheric carbon dioxide
9)
Geotropism is the growth of plants in response to
Nutrients
Soil moisture
Gravity
Sunlight
10)
Which statement about plant stems is correct?
They are positively phototropic and positively geotropic
They are positively phototropic but negatively geotropic
None of these
They are negatively phototropic but positively geotropic
11)
Why is phototropism important for plants?
To protect against herbivores
To optimize photosynthesis
To control leaf shape
To regulate water absorption
12)
From the following real-world applications, where do you think an understanding of Geotropism might be useful?
Studying bird migration
Measuring Ocean currents
Designing space agriculture for astronauts
Predicting weather patterns