Transpiration
Grade X
Biology- Worksheet -
Level :1
I Name the following:
1) The permanent opened pores in bark of the old woody trees
2) An apparatus used for measuring the rate of transpiration
3) A plant in which stomata are sunken
4) An apparatus to compare the rate of transpiration in a cut shoot
5) Kidney shaped cells present at the borders of stomata
6) Respiratory openings found on the stem of woody plants
7) Exudation of sap from injured parts of a plant
8) The loss of water from injured parts of a plant
9) The process by which an intact plant loses water in the form of water droplets
10) The kind of transpiration from the surface of leaves and stem
11) The structure in leaf that allows guttation
12) The plants in which stomata are absent
13) The cells which control the opening and closing of stomata
14) Aerating pores formed in the bark
15) The paper which is used to show loss of water through stomata of a leaf
II. Fill up the blanks:
1) The lower atmospheric pressure ____________ the rate of transpiration
2) ___________ transpiration is a way of maximum water loss by a plant.
3) Exchange of gases in plants take place through _____________.
4) Loss of water of droplets through leaves of an intact plant is termed as ___________.
5) The leaves of the __________ plants have cuticular wax.
III. Define the following:
1) Transpiration 2) Guttation 3) Bleeding 4) Anti-transpirants 5) Wilting 6) Hydathodes
7) Dorsiventralleaf 8) Iso bilateral leaf 9) Lenticels 10) Cuticle 11) Hydathodes 12) Xerophytes
IV) Mention whether the following statements are true or false. If false, rewrite the
statements by changing the bold letters alone.
1) Rate of transpiration is directly proportional to the surface are of the leaves
2) The plants transpire more in high humid conditions outside the plant
3) Bleeding in plants takes place because of reduced root pressure.
4) Stomatal pores open or close in response to the turgor pressure of the guard cells
5) Transpiration is more from the upper surface of a leaf as compared to lower surface in
thedorsiventral leaf.
6) Water from root hairs to leaves travel through xylem vessels.
7) Phenyl mercuric acetate and abscisic acid act as anti- transpirant
8) Most transpiration occurs through lenticels in plants.
9) Low humidity in the atmosphere results in decrease in the rate of transpiration.
10) Transpiration creates a pull for upward movement of the sap.
V) The diagram given below represents an experiement represents an experiment
performed to demonstrate a certain phenomenon in plants. The set-up was kept in
sunlight for about two hours.
(OR)
i) What is the aim of the experiment?
ii) Define the process mentioned above.
iii) What do you observe in the experiment as described by the picture?
iv) What precautions are taken for proper results in the experiment? Why?
v) Suggest a suitable control experiment for comparision.
Level :2
I. Given below is an example of a certain structure and its main functional activity.
Eg. Kidney and Excretion
1) Hydathodes and ____________
2) Lenticels and ____________
3) Thick cuticle and ______________
4) Stomata and _____________
5) Ascent of sap and _________
6) Flaccid guard cells and __________
II. Give one point of difference between the following pairs on the basis of what is indicated
in the bracket.
1) Transpiration and Evaporation ( Definition)
2) Transpiration and Exudation ( Definition and organ involved)
3) Stomatal and lenticular transpiration ( Definition)
4) Stomata and Hydathodes( occurrence)
III) Give scientific reasons for the following facts:
1) Plants have to pay the price of photosynthesis in the form of photosynthesis
2) Transpiration is a necessary evil.
3) Some plants show wilting of their leaves, even when the soil is well watered.
4) The higher rate of transpiration is recorded on windy days rather than on a calm day,
5) During the day transpiration and photosynthesis are interlinked.
6) More transpiration occurs from the lower surface of a dorsiventral leaf.
IV) The diagram given below represents a certain physiological process in plants:
i) What is the aim of this experiment?
ii) Why is the pot covered with a polythene bag?
iii) Why dry cobalt chloride paper is kept ?
iv) What kind of change could you observe after few hours? Why?
v) suggest a control for this experiment.
___________________________________________________________________________
V) The diagram shown below is an apparatus used to study a particular phenomenon in plants:
i) Name the apparatus.
ii) What is it used for?
iii) What is the role played by the air bubble in this experiment?
iv) Of what use is the reservoir?
v) What happens to the movement of the air bubble if the apparatus is kept in
a) the dark
b) sunlight
c) fan
vi) Give a reason for each case.
vii) Write any two disadvantages of this apparatus.
VI) Given below is an experimental set up. Observe it carefully and then answer
carefully.
i) Name the physiological process being studied.
ii) What will be observed in the test tube after two to three?
iii) Give a reason for your answer in (ii) above.
iv) Why is the surface of water covered with oil?
v) Suggest a suitable control for this experiment.
VII) Given below is a diagram of cross section of a leaf demonstrating a certain process.
i) Name the parts labeled 1 to 7.
ii) State one function of parts 1, 2, 4 and 5 6 and 7
iii) Is it a monocot leaf or Dicot leaf? Give a reason for your answer.
iv) How many veins could you see in the given diagram?
v) Give two structural differences between monocot and dicot leaf.
vi) What is the technical term being given for the monocot and dicot leaf?
VIII) Given below is the diagram of an experimental set-up to study the process of
transpiration in plants. Study the same and then answer the following questions:
i) What is the colour of the dry cobalt chloride paper?
ii) Is the experiment leaf a monocot or a dicot leaf? Give a reason to support your answer.
iii) Why are glass slides placed over the dry cobalt chloride paper?
iv) 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 side of the leaf? Give a reason to support your answer.
ix) Given below is a physiological process in plants. Observe it carefully and answer the
following questions:
i) Name the process and define it.
ii) Name the structure through which this process would take place.
iii) When is this process taken place in plants?
iv) List out the factors which favour this process.
Level : 3
Answer the following Questions:
1. Stomata sometimes close during very hot weather. Why?
2. Stomata close in the dark, therefore water saved. Why do plants still lose
water even if their stomata are closed?
3)Why do plants die in water logged soil?
Weblinks:
1) http://www.youtube.com/watch?v=U4rzLhz4HHk
2)http://www.youtube.com/watch?v=w6f2BiFiXiM
3) http://www.youtube.com/watch?v=DpFU-NkKUqg