Question

Match the names of the experiments listed with the aim of the experiment. Choose the answer which gives the correct combination of the alphabets.

Experiment	Aim
A. Girdling experiment	p. Measurement of plant growth
B. Cobalt-chloride paper method	q. Transpiration
C. Crescograph	r. Unequal transpiration on leaf surfaces
D. Bell jar experiment	s. Translocation in phloem

• A. A- s, B- r, C- p, D- q
• B. A- r, B- p, C- s, D- q
• C. A- q, B- p, C- s, D- r
• D. A- s, B- p, C- q, D- r

Answer 1

Answer: (A)

A- s, B- r, C- p, D- q

The girdling experiment proves that ascent of sap occurs through the xylem elements, which are embedded deep inside the tree trunk, whereas transport of sugars occurs through the secondary phloem, which is present in the bark of the tree.
Cobalt-chloride paper test is the hygrometric method to demonstrate transpiration. Change in colour of the filter paper slip from blue to pink indicates transpiration. As considerably more stomata are present on the lower side of the leaf, more transpiration will occur on the lower surface of the leaf.
Bell jar experiment is a test for transpiration. If a plant is covered with a glass bell jar and kept in sunlight; water droplets will get deposited on the inner side of the jar. The source of these water droplets is transpiration.

A crescograph is a device for measuring growth in plants. It was invented in the early 20th century by Sir Jagadish Chandra Bose - a Bengali polymath, physicist, biologist, botanist, archaeologist.

Thus, the correct answer is option A.