By looking at a plant externally can you tell whether a plant is `C_(3) or C_(4)` ? Why and how?

By looking at which internal structure of a plant can you tell whether a plant is C_(3) or C_(4) ? Explain.

Identify each part in a flowering plant and write whether it is haploid (n) or diploid (2n). (a) Ovary ……….. (b) Anther …………. (c ) Egg ……….. (d) Pollen …………. (e ) Male gamete ………….. (f) Zygote …………..

Below is a list of plant fibres. From which part of the plant these are obtained ? (a) Coir (b) Hemp (c) Cotton (d) jute

C_(4) plants loses only half as much water as C_(3) plant for the same amount of CO_(2) fixed