Question

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

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

Answer 1

Answer: (D)

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

Auxanometer is used to measure growth in terms of elongation of plant axis.
Potometer is an instrument for measuring the rate of transpiration by shoots through measuring the rate of their water absorption, as the two are nearly equal, e.g., Ganong's potometer.
Imbibition pressure is the pressure developed by a swelling imbibant if the latter is kept in a confined space. It is due to matric potential present in hydrophilic colloidal particles of the adsorbant.

Dilatometers are the instruments used to measure imbibition pressure.
A sphygmomanometer is a device used to measure blood pressure. It is composed of an inflatable cuff to restrict blood flow, and a mercury or mechanical manometer to measure the pressure. Thus, the correct answer is option D.