Cell - 1 (Grade 10)

Robert Hooke first observed dead cells, whereas Leeuwenhoek first reported free living cells. Purkinje coined the term 'protoplasm'.

A eukaryote is any organism whose cells contain a nucleus and other organelles enclosed within membranes.

The rod-shaped structures in nucleus, which are visible at the time of cell division, are known as chromosomes.

A plant cell wall is composed of an important substance known as cellulose.

The movement of water from a region of higher concentration to a region of lower concentration through a semipermeable membrane is called osmosis.

Cell walls permit the cells of plants, fungi and bacteria to withstand very dilute (hypotonic) external media without bursting. In such media, the cells tend to take up water by osmosis.

The thread-like structures present in the nucleus are called chromatins. They condense at the time of cell division and form chromosomes.

The largest cell measuring 170 mm × 130 mm is the egg of an ostrich. 

This option is correct because in plant cells, the cell wall composed mainly of cellulose is located outside the cell membrane. In animal cell, the cell wall, mainly composed of lipids and phospholipids and nucleus in eukaryotes, is separated from the cytoplasm by double-layered membrane and it directs the life processes of the cell.

This option is correct because in plant cells, the cell wall composed mainly of cellulose is located outside the cell membrane. In animal cell, the cell wall, mainly composed of lipids and phospholipids and nucleus in eukaryotes, is separated from the cytoplasm by double-layered membrane and it directs the life processes of the cell.