NCERT Class 11 Biotechnology Book Chapter 2 Answer English Medium | Cellular Organelles | NCERT Class 11 Biotechnology Book Chapter 2 Book Questions and Answer Solutions English Medium |

Chapter 2

Cellular Organelles

Exercises

1. The Fluid Mosaic Model has been proposed by

(a) Robert Brown

(b) Schleiden and Schwann

(c) Robert Virchow

(d) Singer and Nicolson

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2. Ribosomes are composed of

(a) only rRNA

(b) rRNA and proteins

(c) rRNA, proteins and DNA

(d) lipids, proteins and DNA

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3. Tonoplast is

(a) a membrane covering the cell wall in plant cells

(b) the inner membrane of the mitochondria

(c) a membrane covering the vacuoles

(d) a membrane covering the plastids

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4. Describe the various mechanisms of transport across plasma membrane with the help of labelled diagrams.

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5. Match the following

6. What is the significance of the ratio of protein and lipids in membranes? How does varying the concentration of lipids in a membrane affect its function?

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7. State the importance of cell wall in prokaryotic cells.

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8. A eukaryotic cell contains organelles which may be bound by a single membrane; double-membrane or non-membrane bound organelles. Classify the various eukaryotic organelles into these three types.

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9. Mention the different types of vacuoles.

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10. Peroxisomes share similarities as well as differences with mitochondria and chloroplast. Comment.

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11. What are glyoxysomes? Where are these present? Mention their functions.

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12. Cell is the structural and functional unit of life. Justify the statement.

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13. Distinguish between

(a) cilia and flagella

(b) primary and secondary cell wall

(c) lysosomes and vacuoles

(d) microtubules and actin filaments

(e) active and passive transport

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