Length of pollen tube depends on the distance between [NCERT Exemplar] (a) pollen grain and upper surface of stigma. (b) pollen grain on upper surface of stigma and ovule. (c) pollen grain in anther and upper surface of stigma. (d) upper surface of stigma and lower part of style.

Wavelength of green light is

A) 400-450 nm

B) 500-550 nm

C) 660-720 nm

D) 720-800 nm

What is the difference between anaerobic & aerobic respiration? Name some organism that uses the aerobic mode of respiration?

What are the main components of our environment? Explain each of them briefly.

What are examples of hydrotropism plants?

Why is water liquid at room temperature?