Fill in the blanks :

The process of purifying blood by means of an artificial kidney is called________.

Fill in the blanks :

The onset of menstruation is called_________.

Fill in the blanks :

Sleep movements in many leguminous plants are known as________.

Fill in the blanks :

The determination of the age of a tree by counting the annual rings is known as__________

Fill in the blanks :

The stage in the embryonic development which consists of a solid ball of cells is called__________.

Mention one significant difference between each of the following :

Calyptra and Calyptrogen

Mention one significant difference between each of the following :

Diffusion and Osmosis

Mention one significant difference between each of the following :

Holocrine and Apocrine glands

Mention one significant difference between each of the following :

Fertilisation and Insemination

Mention one significant difference between each of the following :

Xerophthalmia and Night blindness