Question

(a) Name the phenomenon SPRING
BALANCE
being demonstrated.
(b) What is the purpose of
putting oil in the test tube?
(c) What is the purpose of
the spring balance in the
set-up?
LEAFY
SHOOT
(d) Would it make a difference
if the experimental set-up is
WATER
kept in bright sunshine?
OIL​

Answer 1

Answer:

a) Transpiration

b) oil is put on the surface of water to prevent loss of water by evaporation

c) the spring balance progressively measures the change in weight of the set-up. This because as the plant transpires, it creates the suction force in the plant which allow root to absorb more water from the test tube. Hence the water in the test will get reduced. Thus, the weight of the entire set will decrease.

d) yes, the transpiration rate will increase. Transpiration would occur faster. The observable changes will occur in less time

I hope this answer is helpful to you.