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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.

Chloroplasts and mitochondria are organelles which have double membrane .

Mitochondria - is called the power house of the cell as it produces cellular energy in the form of ATP. It is bounded by two membrane, the inner membrane forms inner foldings called cristae. The matrix has a single circular DNA molecule.

Chloroplasts - are also double membrane bound organelles which help to trap the solar energy and produce food. The stroma contains many flattened disc like structures called thylakoids which are arranged in stacks to gorm grana. The chloroplasts consists of the pigment chlorophyll that helps to convert sun's energy to chemical energy.

Functions of :

Mitochondria - It produces the cellular energy in the form of ATP.

Chloroplasts - trap the energy of the sun and produce food.

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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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