VIBHAVARI VATS (ROLL NO.16)

                                             ch-2 :- CELL

                                            EXERCISE                                            

Q 1- Make a comparison and write down ways in which plant cells are different from animal cells.

ANS- 

               PLANT CELLS                                                              ANIMAL CELL

(i) Cell wall is present.                                               (i) Cell wall is absent.

(ii) Plastids are present.                                           (ii) Plastids are absent.

(iii) Vacuoles is single and occupy                         (iii) Vacuoles are many and small.

       the maximum part of the cell 

       (Vacuoles is large).

Q 2- How is a prokaryotic cell different from a eukaryotic cell?

ANS- 

                 PROKARYOTIC CELLS                                             EUKARYOTIC CELLS

(i) Primitive nucleus not bounded by                         (i) The nuclear bounded by

     nuclear membrane and known as nuclead.                nuclear membrane.

(ii) Size of the cell is small.                                         (ii) Size is large.

(iii) Membrane bound organelles absent.                (iii) Membrane bound 

                                                                                             organelles present.

Q 3- What would happen if the plasma membrane ruptures or breaks down?
ANS- If the plasma membrane breaks down or ruptures the cell will die. Plasma membrane helps of             in and out of the substances from the cell, if it break down then the cell contents might leak out.

Q 4- What would happen to the life of a cell if there was no Golgi apparatus?
ANS- Golgi Apparatus helps in storing food for cell. If it is absent then the packaging, storing process           will be absent.
          The Golgi apparatus is involved in the formation of lysosomes or peroxisomes. Thus, if the                 Golgi body is absent in a cell, the synthesis of lysosomes or peroxisomes will not be possible in the cell.

Question -5. Which organelle is known as the powerhouse of the cell? Why?

Answer: Mitochondrion is known as the powerhouse of the cell. The reason for this is the fact that cellular respiration takes place in mitochondria and the energy released after that gets stored in mitochondria; in the form of ATP. These ATP molecules are utilized on an SOS basis.

Question - 6. Where do the lipids and proteins constituting the cell membrane get synthesised?

Answer: Lipids are synthesized in the endoplasmic reticulum. Protein is synthesized in ribosomes which are usually present on the rough ER.

Question - 7. How does an Amoeba obtain its food?

Answer: Amoeba obtains its food through a process called phagocytosis. The cell membrane of amoeba is projected into numerous finger-like outgrowths; called pseudopodia. Amoeba surrounds a food particle by pseudopodia and makes a food vacuole; after engulfing the food.

Question - 8. What is osmosis?

Answer: The movement of water from high concentration to low concentration through a semi-permeable membrane is called osmosis.                                        
                                                END