Write true or false for the statement: Growth of pollen tubes towards ovules is due to chemotropism.

In a synapse,chemical signal is transmitted from :

What is a synapse?

$(a)$ What is reflex arc?
$(b)$ What are the components of reflex arc?
$(c)$ How do muscle cells move?

Answer the following:
$(i)$ Name the endocrine gland associated with the brain.
$(ii)$ Which gland secretes digestive enzymes as well as hormones?
$(iii)$ Name the endocrine gland associated with the kidneys.
$(iv)$ Which endocrine gland is present in males but not in females?
$(v)$ Which hormone is responsible for changes in females during puberty?
$(vi)$ Iodine is necessary for the synthesis of which hormone?

Label the endocrine glands in the figure.