STD 11 - 2. Biology classification — BIOLOGY STD 11 Science — Question

$(i)$ All living organisms have ability to respond the environment stimuli which could be physical, chemical or biological.

$(ii)$ Plants respond to external factors like light, water, temperature, other organisms, pollutants, etc.

$(iii)$ Photoperiod affects the process of reproduction.

$(iv)$ Human being is the only organism who has self consciousness.