Question

Auxanometer is meant for
A. Photosynthetic activity
B. Growth activity
C. The amount of auxins
D. Respiratory activity

Answer 1

Hint: Auxanometer was first discovered by Koningsberger. It is also named to be arc indicator as in arc auxanometer there is wire fixed with the apex of the plant on one end and on other end tied to dead weight that passes over pulley and this pulley has a pointer attached to it when the length of plant increases the pulley then rotates.

Complete Answer:
the quantity which is quantitative can be measured in relation to time. We can measure growth in terms of increase in length, height, volume, area, number. For accurate measurements we use specially designed devices such as Auxanometer.

Now let us match this with given options:
- Photosynthetic activity: CI – 340 Handheld photosynthesis system is used to measure the amount and rate of photosynthesis. It can measure the amount of glucose that gets converted into the energy. Algae is also used to measure photosynthesis.
- Growth activity: Auxanometer is a device that we use for measuring growth in plants. Auxin stands for grow and meter stands for the measure. It is also called Ann arc indicator. These are used in fields, laboratories and classrooms.
- The amount of auxins: It is measured by Salkowski method. Salkowski reagent is used which is 0.5 M ferric chloride and 35% of per chloric acid when reacts with auxin can give pink colour.
- Respiratory activity: Respirometer can be used to measure the respiratory rate in plants which measure the amount of carbon dioxide and oxygen that gets exchanged.

Hence the correct answer is option B.

Note: The growth of a plant is an important perspective of its life cycle. Majority of the plants show growth throughout their life period and the rate of growth is slow or may be fast. An auxanometer is used as an instrument to measure and calculate the rate of plant growth over a period of time. The growth in plants is controlled and responded by various environmental conditions such as light, humidity, water, soil as well as other environmental conditions such as temperature etc.