Every organism needs food. Does a cell also need it? Explain very briefly.

All organisms excrete. Does an invidiual cell also do it? give one example

Do you think the cells of an elephant would be larger than the cells of a rat ? Explain briefly.

Optically active 2-iodo butane on treatment with NaI in acetone gives a product which does not show optical activity. Explain briefly.

Plants need carbon dioxide and (i) ________, the raw materials for photosynthesis to occur. The (ii) ___________ is trapped by chlorophyll for converting the raw materials into chemical energy of food. (iii) ___________ are oval shaped organelles found in the leaf cells. They contain the chlorophyll pigments. The food prepared by plants is carried by (iv) __________ to organs like roots, stems and leaves for its (v) ________.

When an arrow is shot from a bow, it has kinetic energy in it. Explain briefly from where does it get its kinetic energy.

Human insulin when synthesised in the body needs to be processed before it can act. Explain giving reasons.

Why does anaerobic respiration produce less energy than aerobic respiration. Explain briefly.

$ Cellular totipotency means that single cell can give rise to a fully grown multicellular organisms ! Meristematic cells are also called "stem cells".

Every mineral element that is present in a cell is needed by the cell.

Which structure does a cell need for movement ?