Question

Auxanometer is used to measure plant organ-
a. Growth in length
b. Growth in breadth
c. Pest population
d. Both A and B

Answer 1

A device for calculating increases in plant growth in response to short-term changes in the composition of the atmosphere. This delicate instrument makes growth measurements as small as a micrometer.

Complete answer:

Option A is correct. An auxanometer, also referred to as an arc-indicator, is defined as an apparatus used to measure plant growth. Auxin stands for growth and metron stands for the measure, the sense of the auxanometer. Koningsberger invented the auxanometer apparatus.

Option B is incorrect. Only over a short period of time can plant growth be measured by its length. Therefore, growth in breadth cannot be measured with an auxanometer.

Option C is incorrect. Integrated pest management (IPM) is a broad-based approach that incorporates practises for the economic control of pests, also known as integrated pest control (IPC). IPM attempts to eradicate populations of pests below the level of economic harm (EIL). IPM is described by the United Nations Food and Agriculture Organization as 'a careful consideration of all available techniques for the control of pests and the subsequent incorporation of effective measures that prevent the production of pest populations and hold pesticides and other interventions at economically justified levels and reduce or minimise risks to human health and the environment.

Option D is incorrect. The auxanometer is a measurement device for plant growth in the form of length only. It is unable to measure the plant's width. This choice is, therefore, incorrect.

Hence, the correct answer is option (A).

Note: There is a wire fixed with a plant apex on one end and a dead-weight on the other in the case of an arc-auxanometer. It passes over a pulley which is connected to a pointer. The pulley rotates as the height of the plant increases and the pointer shifts on a circular scale to specifically give the growth magnitude.