Define phototropism and give one example.

Write two differences between the response of the plants and the response of the animals to stimuli.

Give a reason to explain why:
$(i)$ Adrenaline helps in dealing with emergency situations?
$(ii)$ Secretions of growth hormone should be specific in the human body?
$(iii)$ Some patients of diabetes are treated by giving injections of insulin?

Which is the most complex part of the brain?

Answer the following:
$(a)$ Which hormone is responsible for the changes noticed in females at puberty?
$(b)$ Dwarfism results due to deficiency of which hormone?
$(c)$ Blood sugar level rises due to deficiency of which hormone?
$(d)$ Iodine is necessary for the synthesis of which hormone?

$(a)$ Identify the phytohormone used by plants while performing the following functions:
$(i)$ Cell division in shoot tip.
$(ii)$ Inhibiting growth on approach of unfavourable conditions.
$(b)$ List in tabular form two differences between the movement in 'touch me not' plant and movement of shoot towards light.