_________ helps in the exchange of gases.

The walls of Sclerenchyma cells are thick due to the presence of  ___________________.

The meristem that occurs at the base of the internodes in monocots is

The cells of ___________ tissue possess the power of cell division.

A compound epithelium found in the lining of the mouth cavity, epidermis of skin, tongue, oesophagus and vagina is

Parenchyma cells which  contain chloroplasts are called __________.

In small herbaceous plants, ____________ makes up the bulk of the plant body.

The body of an adult human being contains about ____________________ litres of blood.