The shape of guard cells changes due to change in the :

  • A
    Amount of water in cells.
  • B
    Temperature of cells.
  • C
    Protein composition of cells.
  • D
    Position of nucleus in the cells.

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Which hormone regulates the rate of metabolism of carbohydrates,proteins,and fats?

State whether the following statement is true or false: The pituitary gland secretes growth hormone.

Dramatic changes of body features associated with puberty are mainly because of the secretion of:

Match the terms of Column $(A)$ with those of Column $(B)$.
< strong>Column $(A)$ < strong>Column $(B)$
$(a)$ Olfactory receptors $(i)$ Tongue
$(b)$ Thermoreceptors (temperature receptors) $(ii)$ Eye
$(c)$ Gustatoreceptors $(iii)$ Nose
$(d)$ Photoreceptors $(iv)$ Skin

Which gland produces the hormone thyroxine?

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