Ganong's Potometer.

Q.

Take three test tubes. Fill each of them with water. Label them A, B and C. Keep a snail in test tube A, a water plant in test tube B, and in C, keep the snail and plant both. Which test tube would have the highest concentration of ${\mathrm{CO}}_2$?

Q. The given diagram represents the set-up at the start of a certain experiment to demonstrate an activity of plants. [5 MARKS]
(a) What is the aim of the experiment?



(b) Why has oil been put in each test tube?
(c) What will be the observation in the two test tubes after about 2 to 3 days?
(d) Give a reason to explain any change observed as answered in (c) above.
(e) Why is test tube B without a plant taken in the experiment?

Q.

Which of the following is used to determine the rate of transpiration in plants?

1. porometer

2. potometer

3. barometer

4. none of these

Q.

Ganong's potometer is an instrument that is used to measure the rate of transpiration.

1. True

2. False

Q.

A potometer measures the

1. the rate at which the plant grows

2. All of the above

3. the rate at which photosynthesis occurs

4. intake of water by the plant

Q.

Which of the following potometers help in measuring the rate of intake of water by the plant?

1. Farmer's potometer

2. Ganong's potometer

3. Darwin's potometer

4. Garreau's potometer

Q.

Give appropriate biological/technical term for the following:

An apparatus that measures the rate of water uptake in a cut shoot due to transpiration.

Q. Select the correct option regarding the four statements.
(i) Instrument used to measure transpiration pull.
(ii) Instrument used to measure the size of stomata.
(iii) Instrument used to measure the pressure of the fluid.
(iv) Amount of osmosis per unit time.

1. (i) - Potometer, (ii) - Manometer, (iii) - Porometer, (iv) - Osmometer
2. (i) - Porometer, (ii) - Manometer, (iii) - Potometer, (iv) - Osmometer
3. (i) - Monometer, (ii) - Potometer, (iii) - Porometer, (iv) - Osmometer
4. (i) - Potometer, (ii) - Porometer, (iii) - Manometer, (iv) - Osmometer

Q. The potometer does not measure the rate of transpiration accurately because

1. The plants are turgid.
2. Not all the water taken by the plant is used for transpiration.
3. It measures the rate of uptake of water.
4. Both B and C.

Q. Potometer works on the principle of

1. Osmotic pressure
2. Amount of water absorbed equals the amount transpired
3. Root pressure
4. Potential difference between tip of tube and that of plant

Q.

The ___ in Ganong's potometer marks the progress of transpiration.

1. stop cock

2. reservoir water level

3. air bubble

4. beaker water level

Q. Potometer is an instrument that measures

1. Respiration
2. Transpiration
3. Growth
4. Photosynthesis

Q. Potometer is a device used for measuring rate of

1. Imbibtion
2. Ascent of sap
3. Transpiration
4. Pholem transport.

Q. Potometer and clinostat are used to study

1. Photosynthesis and respiration
2. Transpiration and growth
3. Phototropism and geotropism
4. Transpiration and geotropism

Q. Principle of working of all potometers is

1. Absorption occurs by stem
2. Absorption is a physical process
3. Absorption is proportional to transpiration
4. Transpiration depends on light

Q. Ganong's potometer is used to measure _____________.

1. Photosynthesis
2. Respiration
3. Transpiration
4. Guttation

Q. Rate of transpiration is measured by which instrument?

Q. Guttation occurs in

1. Early morning
2. Noon
3. Evening
4. Morning 10 O'clock

Q. Transpiration is measured by

1. Manometer
2. Barometer
3. Hygrometer
4. Potometer

Q. Match the correct set with their images.
1. Manometer
2. A potato osmoscope
3. A Osmoscope

1. 1- C, 2- B, 3- A
2. 1- A, 2- B, 3- C
3. 1- B, 2- C, 3- A
4. None of the above

Q. Potometer measures the

1. Rate of photosynthesis.
2. Rate of transpiration.
3. Rate of guttation.
4. All of the above.

Q. Find the correct order for instrument used for measuring
(i) Transpiration (ii) Size of stomata (iii) Atmospheric pressure (iv) Osmosis

1. Potometer, porometer, manometer, osmometer
2. Manometer, potometer, porometer, osmometer
3. Porometer, manometer, potometer, osmometer
4. Potometer, manometer, porometer, osmometer

Q. Given appropriate biological/ technical terms for the following:
An apparatus that measures the rate of water uptake in a cut shoot due to transpiration.

Q. Match the different types of instruments listed under with their uses. Choose the answer which gives the correct combination of the alphabet of the two columns.

Instrument	Uses
A. Auxanometer	p. Measurement of imbibition pressure
B. Potometer	q. Measurement of blood pressure
C. Dilatometer	r. Measurement of transpiration rate
D. Sphygmomanometer	s. Measurement of diffusion
	t. Measurement of growth rate in plants

1. A- s, B- r, C- q, D- p
2. A- t, B- r, C- q, D- p
3. A- t, B- r, C- p, D- q
4. A- t, B- p, C- r, D- q

Q. Potometer is used to measure

1. Transpiration
2. Photosynthesis
3. Root pressure
4. Ascent of sap

Q.

70 Plants give out oxygen gas during a process ……….

Q. Which of the following is used for determining the rate of transpiration in plants?

1. Porometer
2. Auxanometer
3. Tensiometer
4. Potometer

Q. measure the rate of transpiration using ganongs potometer elaborately

Q. Potometers are made on the principle that

1. The amount of water transpired is approximately equal to amount of water absorbed.
2. The amount of water transpired is more than the amount of water absorbed.
3. The amount of water transpired is less than the amount of water absorbed.
4. Humidity causes reduction in transpiration.

Q. Potometer determine

1. Comparison of stomatal and cuticular transpiration
2. Transpiration and absorption ratio
3. Opening of somata
4. None of the above