Transpiration
Trending Questions
Why more stomata are present on the underside of the leaf?
Define transpiration.
From where do green plants get carbon dioxide? For 1, 2&3marks
Study the diagram given below and answer the questions that follow:
(a) Name the process being studied in the above experiment.
(b) Explain the process mentioned in (a) above.
(c) Why is oil placed over water?
(d) What do we observe with regard to the level of water when this set up is placed in (1) bright sunlight (2) humid conditions (3) windy day?
(e) Mention any three adaptions found in plants to foster the process mentioned in (a) above.
How is excretion in plants useful to human being?
Explain the transpiration pull theory for the ascent of sap?
Given above is the diagram of an experimental setup to study the process of transpiration in plants. Study the same and then answer the questions that follow:
(a) Name the color of dry cobalt chloride paper?
(b) Is the experimental leaf a monocot or a dicot? Give a reason to support your answer.
(c) Why are glass slides placed over the dry cobalt chloride papers?
(d) After about half an hour what change, if any, would you expect to find in the cobalt chloride paper placed on the dorsal and ventral sides of the leaf? Give a reason to support your answer.
Give reasons for the following:
(a) If you sprinkle some common salt on grass growing on a lawn, it is killed at that spot.
(b) If you uproot a plant from the soil, its leaves soon wilt.
(c) It is better to transplant seedlings in a flower-bed in the evening and not in the morning.
(d) A plant cell when kept in a hypertonic salt solution for about 30 minutes turns flaccid.
(e) Potato cubes when placed in water become firm and increase in size.
Give two advantages of transpiration.
In an experiment, four freshly plucked leaves (A - D) of a plant, such as those of China-Rose, were treated as follows :
(A) coated with vaseline on its upper surface.
(B) coated on the lower surface.
(C) coated on both surfaces.
(D) left uncoated.
All the four leaves A, B, C and D were left in a room for about 24 hours.
(i) Which leaf would become most limp ? Why ?
(ii) Which leaf would show least limping ? Why ?
Give the reason:
Transpiration is important for plants.
An apparatus as shown below was set up to investigate a physiological process in plants. The setup was kept in sunlight for two hours. Droplets of water were then seen inside the bell jar. Answer the questions that follow :
(a) Name the process being studied.
(b) Explain the process named above in (a) .
(c) Why was the pot covered with a plastic sheet ?
(d) Suggest a suitable control for this experiment.
(e) Mention two ways in which this process is beneficial to plants.
(f) List three adaptations in plants to reduce the above mentioned process.
What is translocation ?
A column of water within xylem vessels of tall trees does not break under its weight because of?
Dissolved sugar in the water
Lignification of xylem vessels
Tensile strength of water
Positive root pressure
Choose the correct option:
(b) Water absorption through roots can be increased by keeping the plants
(i) in the shade
(ii) in dim light
(iii) under the fan
(iv) covered with a polythene bag
Briefly explain, how transpiration helps in the upward conduction of water from the soil?
Given below is an example of a certain structure and its special functional activity :
chloroplasts and photosynthesis.
In a similar way, write the functional activity against each of the following :
(a) Hydathodes and ________
(b) Leaf spines and ________
(c) Lenticels and ________
(d) Xylem and ________
The diagram below shows an experiment in which: [3 MARKS]
(a) Leaf A was coated with grease on both surfaces.
(b) Leaf B was coated with grease on the lower surface.
(c) Leaf C was coated with grease on the upper surface.
(d) Leaf D was left without any application of grease.
Answer the following:
(i) Which leaf dries first?
(ii) Which leaf dries last?
(iii) Which leaf does not show any change?
Name the following :
(a) Openings on the stem through which transpiration occurs.
(b) The process by which the intact plant loses water in the form of droplets.
(c) An instrument used to find the rate of transpiration.
(d) A plant in which the stomata are sunken.
(e) The apparatus to record the rate of transpiration in a cut shoot.
(f) Any two parts of a leaf which allow transpiration.
(g) The structure in a leaf that allows guttation.
(h) Loss of water as droplets from the margins of certain leaves.
Given below is the diagram of an apparatus used to study a particular phenomenon in plants :
(a) Name the apparatus.
(b) What is it used for ?
(c) What is the role played by the air-bubble in this experiment ?
(d) What is the use of the reservoir ?
(e) What happens to the movement of the air-bubble if the apparatus is kept :
(i) in the dark; (ii) in sunlight; (iii) in front of a fan ?
Give a reason in each case.
The most abundant intracellular cation is?
Transpiration is best defined as
(a) loss of water by the plant.
(b) evaporation of water from the aerial surfaces of a plant.
(c) loss of water, as water vapour, by a plant.
(d) release of water by a plant into the atmosphere.
Read the statements given below and choose the correct option-
Assertion: The movement of water in the xylem is always upward.
Reason: The downward movement of water is due to the pressure created by transpiration.
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
Both Assertion and Reason are incorrect.
Assertion is correct but Reason is incorrect
Question 4
How are water and minerals transported in plants?
What is transpiration pull? How is it caused?
Transpiration will be fastest when the day is
(a) cool, humid and windy
(b) hot, humid and still
(c) hot, humid and windy
(d) hot, dry and windy
Write a short note on excretion in plants.
The water reaches great heights in the trees because of suction pull caused by ______.
- Water is lost in the form of vapour.
- Water is lost through hydathodes.
- It occurs in presence of sunlight.
- It cools the plant body.
