Why chloroplasts are called the ‘kitchens’ of the cell?
Chloroplasts contain the green piment chlorophyll. These pigment are important for photosynthesis as they trap the solar energy and produce food from it. So, chloroplasts are the ‘kitchens of the cells’.
Write the functions of cell wall.
Functions of cell wall are :
(i) It provides rigidity to the plant cell.
(ii) It prevents drying of cells.
(iii) It provides shape to the plant cell.
Why do grass look green, papaya yellow and edible part of water melon red?
The grass looks green because of the presence of chloroplast which have green pigment called chlorophyll. Papaya and watermelon are of yellow and red colour respectively because of the presence of chromoplasts having pigments with different colours.
There are three main components of a cell :
(i) Cell membrane, (ii) Cytoplasm, (iii) Nucleus.
Cytoplasm- The cytoplasm and nucleus are enclosed within the cell membrane. The cell membrane is also called Plasma membrane. It membrane separates cells from one another. The plasma membrane is porous and allows the movement of substances or material both inward and outward.
Why is it said that ‘a cell without nucleus is without any future’?
It is said because the nucleus controls all the metabolic activities directly or indirectly. It controls the formation of various cell organelles by controlling the synthesis of proteins. It also contains the genes which are the hereditary units. A cell without a nucleus cannot perform tha vital activities, hence, it has no future.
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