If a potted plant is covered with a glass jar, water vapours appear on the wall of glass jar. Explain why?
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Leaves of a healthy potted plant were coated with vaseline. Will this plant remain healthy for long? Give reasons for your answer.
The plant will not remain healthy for long and it will die. Vaseline is thick and it will block the stomata so there will be no intake of carbon dioxide. It will...
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A jar contains 24 marbles, some are green and others are blue. If a marble is drawn at random from the jar, the probability that it is green is 2/3,
Solution: Total number of outcomes = 24 P (Green) = 2/3 If number of green balls is G then; G/24 = 2/3 or, G = (24*2)/3 = 16 Hence, number of blue balls = 24 –...
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Do plant's meristematic cells have a secondary cell wall. If yes is it closer to plasmalemma then primary cell wall?
Yes, secondary is closer than primary
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Do plant's meristematic cells have a secondary cell wall. If yes is it closer to plasmalemma then primary cell wall?
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Some of the very old glass objects appear slightly milky instead of being transparent. Why ?
Reallignment of molecules takes place due to movement because of constant heating and cooling.
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Will a leaf taken from a potted plant kept in a dark room for a few days turn blue black when tested for starch? Give reasons for your answer
No, all the starch stored in the leaf would have been used up by the plant. No starch would be synthesised afresh due to non-availability of sunlight.
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Leaves of a healthy potted plant were coated with vaseline to block the stomata.
If waxy coating is made on the surface of leaf, loss of water in the form of water vapour does not take place. Even the gaseous exchange will not take...
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A beaker containing a liquid is kept inside a big closed jar. If the air inside the jar is continuously pumped out,
(b) decrease EXPLANATION: The pressure at the bottom of the liquid is the sum of atmospheric pressure and the pressure due to the height of the liquid. When the air inside the...
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Consider the situation of the previous problem. Let the water push the left wall by a force F_1 and the right wall by a force F_2.
The correct answer is (b) F1 > F2. EXPLANATION: As the pressure depends on the depth of the liquid at rest, similarly in an accelerating liquid the pressure due to acceleration depends on the...
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Suppose the glass of the previous problem is covered by a jar and the air inside the jar is completely pumped out. (a) What will be
(a) In this case the atmospheric pressure on the surface of the water = zero. Hence, the pressure of water at the bottom of the glass =ρgh =1000*10*(20/100) N/m² =2000 N/m² Hence the...
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