Name the plant part :
(a) which bends in the direction of gravity but away from light
(b) which bends towards light but away from the force of gravity
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(a) The scattering away of red light makes the sky appear blue during the day time. (b) The scattering away of blue light makes
(a) The scattering away of red light makes the sky appear blue during the day time. False (b) The scattering away of blue light makes the sun appear red at sunset. True
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Fill in the following blanks : (a) A plant’s response to light is called………….. (b) A plant’s response to gravity is called…………..
(a) Phototropism. (b) Geotropism. (c) Light. (d) Gravity. (e) Touch. (f) Earth, gravity. (g) Geotropism. (h) Auxin. (i) Photonasty
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How is the work done by a force measured when (i) force is in direction of displacement, (ii) force is
(i) When force is in direction of displacement, then work done , W = F × S (ii) When force is at an angle θ to the direction of displacement, then work done, W...
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A force F acts on a body and displaces it by a distance S in a direction at an angle θ with the direction of force.
(a) When force is at an angle θ to the direction of displacement, then work done, W= F S cos θ (b) (i) For zero work done, the angle between force and displacement should be...
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When a ray of light from air enters a denser medium, it: (a) bends away from the normal
The ray of light bends towards the normal. Reason: As the speed of light decreases in the denser medium, it bends towards the normal.
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A ray of light when passes from glass to air, bends towards the normal.
False A ray of light when passes from glass to air, bends towards the normal.
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A ray of light moving from an optically rarer to a denser medium 1. bends away from the normal
bends towards the normal
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A freely suspended magnet rests in 1. east-west direction 2. north-south direction 3. north-east direction 4. north-west direction
2. north-south direction
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Name the following: 1. The part of the plant which grows under the ground: 2. The part of the plant which grows above the soil:
1. The part of the plant which grows under the ground: root 2. The part of the plant which grows above the soil: shoot
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When light enters from one medium into another, we say refraction takes place. Light bends on undergoing refraction,
(i) Laws of refraction : (a) The incident ray, the normal and the refracted ray, all lie in the same plane. (b) The ratio of sine of the angle of incidence and...
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