Science - Class 9

Q57. What would happen if the plasma membrane ruptures or breaks down? 

 

Q58. Following are a few definitions of osmosis. Read carefully and select the correct definition.

(a) Movement of water molecules from a region of higher concentration to a region of lower concentration through a semi- permeable membrane.

(b) Movement of solvent molecules from its higher concentration to lower concentration.

(c) Movement of solvent molecules from higher concentration to lower concentration of solution through a permeable membrane.

(d) Movement of solute molecules from lower concentration to higher concentration of solution through a semi-permeable membrane.

 

Q59. Name the organelles which show the analogy written as under

(a) Transporting channels of the cell _______

(b) Power house of the cell _______

(c) Packaging and dispatching unit of the cell _______

(d) Digestive bag of the cell _______

(e) Storage sacs of the cell _______

(f) Kitchen of the cell _______

(g) Control room of the cell _______

 

Q60. The cell organelle involved in forming complex sugars from simple sugars are

(a) endoplasmic reticulum

(b) ribosomes

(c) plastids

(d) Golgi apparatus.

 

Q61. Differentiate between nucleus and nucleoid.

 

Q62. Write a short note on plastids.

 

Q63. Why is endocytosis found in animals only?

 

Q64. Which out of the following is not a function of vacuole?

(a) Storage

(b) Providing turgidity and rigidity to the cell

(c) Waste excretion

(d) Locomotion

 

Q65. Make a comparison and write down ways in which plant cells are different from animal cells.

 

Q66. How is a prokaryotic cell different from a eukaryotic cell?

 

Q67. How is a bacterial cell different from an onion peel cell?

 

Q68. What are the consequences of the following conditions?

(a) A cell containing higher water concentration than the surrounding medium.

(b) A cell having low water concentration than the surrounding medium.

(c) A cell having equal water concentration to its surrounding medium.

 

Q69. How do substances like CO₂ and water move in and out of the cell? Discuss.