Question

Intensity of light can be measured by
A. Lux Meter
B. Wilmott's bubbler
C. Ganong’s potometer
D. Farmer’s potometer

Answer 1

Hint: In the photosynthesis process, light is an essential controlling factor. Light energy is absorbed and used to convert water, carbon dioxide , and minerals into oxygen and energy-rich organic compounds during photosynthesis in green plants.

Complete answer:
Lux Meter- The instruments calculate and store the related measured variables: temperature , relative humidity, air pressure, light, and acceleration through a vibration sensor on three axes. This lux metre is therefore suitable for machine vibration monitoring while simultaneously measuring and recording the system's related environmental conditions. Lux is the illuminance and luminous emittance SI unit, measuring luminous flux per area unit. It is equal to one per square metre of lumen. This is used in photometry as an intensity scale.
Wilmott’s bubbler- It is used for photosynthesis experiments. Hydrilla experiment is done through it where the bubbler for Wilmott consists of a large mouthed bottle fitted with a cork into which a glass tube is inserted. A cork with a hole through which a twig of the Hydrilla plant is inserted is fitted to the lower end of this tube; its other end terminates in a narrow bent nozzle. Another glass tube that serves as a reservoir of water covers the upper half of this tube. Water fills the whole apparatus. Care is taken so that the water level stays above the bent nozzle in the reservoir.
Ganong's potometer- A potometer, called Ganong's potometer, tests the rate of transpiration. By measuring the rate of their water absorption, the Potometer is an instrument to calculate the rate of transpiration by shoots, as the two are almost equal. A system used to measure the stomatal conductance of leaves is the potometer. In leafy twigs, this process is used to calculate transpiration.
Farmer's potometer- The apparatus consists of a central reservoir with a three-piece stopper containing a millimetre-graduated capillary tube, a stopcock funnel and a short 10 mm glass tubing length to carry the shot of the factory. To calculate the rate of water absorption by a cut plant shoot. The apparatus consists of a central reservoir with a three-piece stopper containing a millimetre-graduated capillary tube, a stopcock funnel and a short 10 mm glass tubing length to carry the shot of the factory.

Hence the correct answer is (A)

Note: The most natural habitat of a plant provides the light intensity required for optimal growth. As a consequence, various types of plants can need distinct intensities of light. High-light plants need more power per square foot of growing space, while higher intensities further encourage growth and flowering.