What is a tissue? Give two examples of tissues.

Fill in the blanks with suitable words :

(a) Cells were first observed in cork by ………………… in 1665.

(b) What is brick to a house is …………. To an organism.

(c) The cytoplasm and nucleus make up the ……………………………….

(d) The shape and size of a cell is related to its ………………………….

(e) The bacteria cells are ……….. to ………………micrometer in length.

(f) The smallest unit of life is a ………

(g) Tissues make up ………………..

(h) Organ systems make up an …………

(i) Cells make up …………………………………

(j) Organs make up …………………………..

Why are plant and animal specimens usually stained with dyes before observing them through a microscape ? Name one stain (or dye) used for this purpose.

What is an organ? Give two examples of organs.

What is an organ system ?

(a) Give two examples of organ systems in animals.

(b) Name the two main organ systems in plants .