Q24 of 805 Page 156

Which cell organelle controls most of the activities of the cell?

Nucleus is the cell organelle that controls most of the activities of the cell. Nucleus instructs the cell to carry out functions like growth, development and division. Most of the genetic material DNA is located inside the nucleus.


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Name the different components of xylem and draw a living component of it.

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Classify the following organisms based on the absence/presence of true coelom (i.e. acoelomate, pseudocoelomate and coelomate)

Spongilla, Sea anemone


Planaria, Liver fluke


Wuchereria, Ascaris


Nereis, Scorpion


Earthworm, Birds


Fishes, Horse

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Draw well labeled diagrams of various types of muscles found in human body.

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The following velocity-time graph shows the motion of a cyclist. Find (i) its acceleration, (ii) its velocity and (iii) the distance covered by the cyclist in 15 seconds.