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Cell : The Unit of Life

Match The Following

161. Match the following

A. Cristae	(i) Flat membranous sacs in stroma
B. Cisternae	(ii) Infoldings in mitochondria
C. Thylakoids	(iii) Disc-shaped sacs in Golgi apparatus.

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Long Answer Type

162. Name two cell-organelles that are double membrane bound. What are the characteristics of these two organelles ? State their function and draw labelled diagrams of both.

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Multiple Choice Questions

163. Which of the following is correct :

Cells of all living organisms have a nucleus.
Both animal and plant cells have a well defined cell wall.
In prokaryotes there are no membrane bound organelles.
Cells are formed by de novo from abiotic materials.

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Short Answer Type

164. What is a mesosome in prokaryotic cell? Mention the functions that it performs.

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Long Answer Type

165. What are the characteristics of prokaryotic cells?

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Short Answer Type

166. Multicellular organisms have division of labour. Explain.

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Long Answer Type

167. What is a centromere ? How does the position of centromere form the basis of classification of chromosomes. Support your answer with a diagram showing the position of centromere on different types of chromosomes.

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Short Answer Type

168. Cell is the basic unit of life. Discuss in brief.

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Long Answer Type

169. What are nuclear pores ? State their function.

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Short Answer Type

170. Both lysosomes and vacuoles are endomembrane structures, yet they differ in terms of their function. Comment

The vacuoles and lysosomes both are endomembrane structures but differ in the functin as vacuoles perform the function of storage whereas the lysosomes carry out the function of digestion. The lysosome has hydrolytic enzymes and carries out digestion of proteins, carbohydrate and lipids. The vacuoles store waste material. The food vacuole stores food.

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