Transpiration - Practicals assessment (ICSE)

What is the Name of this apparatus?

• Ganong's Potometer

• Garreu's Potometer

• Farmer's Potometer

• Darwin's Potometer

What is expected to occur after the leafy shoot, together with the potometer, is placed in a dark, cool cupboard for one hour?

• The air bubble in the capillary tube moves towards the leafy shoot at a faster rate

• The air bubble in the capillary tube moves towards the leafy shoot at a slower rate

• The air bubble in the capillary tube moves away from the leafy shoot

• There may not be an observable change in the movement of the air bubble or it would be too slow

What happens to the movement of air bubble if apparatus is kept in front of a fan

• Air bubble does not move

• Air bubble moves very little

• Air bubble does not change its position

• Air bubble moves very fast

Mention the limitations of this apparatus.

(Select/Check all that is correct)

• A potometer does not measure the water loss by transpiration.

• It is very difficult to introduce an airbubble in the setup.

• It does not calculate the rate of transpiration with the required accuracy

• The leafy shoot does not remain live for longer period of time.

This is not a precaution in the use of the potometer

• The twig may not remain alive for long

• The potometer should be water tight

• The twig should be cut under water

• The twig should be cut obliquely

What is the function of part marked reservoir?

(Select all answers that are correct)

• To Supply water to the capillary tube.

• To reset the air bubble.

• To stop transpiration.

• To fasten the rate of transpiration.

Name the apparatus shown in the diagram

• Ganong's Potometer

• Farmer's Potometer

• Darwin's Potometer

• Garreu's Potometer

What is the purpose of this apparatus?

• To study transpiration from the surface of leaves

• To study difference in the transpiration from both the surface of leaves

• To study transpiration from the under suface of leaf

• To study transpiration from the upper surface of leaf

What is the function of CaCl2?

• To absorb O₂

• To absorb O₂

• To absorb H₂O vapour

• To absorb CO₂

Which surface of the leaf shows more transpiration?

• Upper

• Lower

• Both

• None