CLASS 10 BIOLOGY CHAPTER 4 (TRANSPIRATION) A. TRANSPIRATION: The process by which loss of water takes place in the form of vapour from the aerial parts of the plant. B. EXPERIMENT NO.I AIM: To demonstrate the process of transpiration. PROCEDURE: Take a well watered potted plant and cover the pot along with soil ( to prevent loss of soil water by evaporation) .Cover the pot with bell jar .Leave the apparatus in the sunlight for few hours. OBSERVATION: water droplets will be seen from the interior of the glass . INFERENCE: water droplets are the condensed form of vapor which are released from the leaves. C. EXPERIMENT NO.2
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
CLASS 10
BIOLOGY
CHAPTER 4 (TRANSPIRATION)
A. TRANSPIRATION: The process by which loss of water takes place in the form of vapour
from the aerial parts of the plant.
B. EXPERIMENT NO.I
AIM: To demonstrate the process of transpiration.
PROCEDURE: Take a well watered potted plant and cover the pot along with soil ( to
prevent loss of soil water by evaporation) .Cover the pot with bell jar .Leave the
apparatus in the sunlight for few hours.
OBSERVATION: water droplets will be seen from the interior of the glass .
INFERENCE: water droplets are the condensed form of vapor which are released from
the leaves.
C. EXPERIMENT NO.2
AIM: To demonstrate the process of transpiration.
PROCEDURE:
SET-UP A: Take a well watered potted plant and cover the pot along with soil ( to
prevent loss of soil water by evaporation) .Cover the pot with bell jar .Leave the
apparatus in the sunlight for few hours.
SET-UP B: Keep a cobalt chloride paper in the similar set-up B.
SET-UP C: Take a bell jar and place a cobalt chloride paper in it but no potted plant(this
is also called a control experiment).
OBSERVATION:
SET-UP A: water droplets will be seen from the interior of the glass .
SET-UP B: Colour of cobalt chloride paper changes from blue to pink.
SET-UP C: Colour of cobalt chloride paper remains the same.
INFERENCE: Cobalt chloride changes the colour in the presence of water/moisture.
D. EXPERIMENT NO.3
AIM: To measure the rate of transpiration.
PROCEDURE: Take a well watered potted plant and cover the pot along with soil ( to
prevent loss of soil water by evaporation). Keep the set-up on a pan balance and note
the initial weight. Reweigh the set-up at regular interval of time.
OBSERVATION: The readings show the decrease of weight every time.
INFERENCE: weight loss due to transpiration.
G. TYPES OF TRANSPIRATION:
1. Stomatal transpiration:
2. Cuticular transpiration
3. Lenticular transpiration
H. STRUCTURE OF STOMATA :
1. They are microscopic structure surrounded by two guard cells.