Q25. Cell wall of which one of these is not made up of cellulose?

(a) Bacteria

(b) Hydrilla

(c) Mango tree

(d) Cactus

 

Q26. What is the purpose of the large central vacuole in plant cells?

Or

What role does the central vacuole in a plant cell have?

 

Q27. Write a short note on prokaryotic cells.

 

Q28. How does an Amoeba obtain its food? 

 

Q29. Amoeba acquires its food through a process, termed

(a) exocytosis

(b) endocytosis

(c) plasmolysis

(d) exocytosis and endocytosis both.

 

Q30. We eat food composed of all the nutrients like carbohydrates, proteins, fats, vitamins, minerals and water. After digestion, these are absorbed in the form of glucose, amino acids, fatty acids, glycerol etc. What mechanisms are involved in absorption of digested food and water?

 

Q31. If you are provided with some vegetables to cook, you generally add salt into the vegetables during cooking process. After adding salt, vegetables release water. What mechanism is responsible for this?

 

Q32. Which cell organelle plays a crucial role in detoxifying many poisons and drugs in a cell?

(a) Golgi apparatus

(b) Lysosomes

(c) Smooth endoplasmic reticulum

(d) Vacuoles

 

Q33. Lipid molecules in the cell are sythesised by

(a) smooth endoplasmic reticulum

(b) rough endoplasmic reticulum

(c) Golgi apparatus

(d) plastids.

 

Q34. Organelle without a cell membrane is

(a) ribosome

(b) Golgi apparatus

(c) chloroplast

(d) nucleus.

 

Q35. Do you agree that “a cell is a building unit of an organism”. If yes, explain why?

 

Q36. Why is the plasma membrane called a selectively permeable membrane? 

 

Q37. Who discovered cells, and how? 

 

Q38. Find out the false sentences.

(a) Golgi apparatus is involved with the formation of lysosomes.

(b) Nucleus, mitochondria and plastid have DNA; hence they are able to make their own structural proteins.

(c) Mitochondria is said to be the power house of the cell as ATP is generated in them.

(d) Cytoplasm is called as protoplasm.

 

Q39. The only cell organelle seen in prokaryotic cell is

(a) mitochondria

(b) ribosomes

(c) plastids

(d) lysosomes.

 

Q40. The proteins and lipids, essential for building the cell membrane, are manufactured by

(a) rough endoplasmic reticulum

(b) Golgi apparatus

(c) plasma membrane

(d) mitochondria.

 

Q41. Select the odd one out.

(a) The movement of water across a semi- permeable membrane is affected by the amount of substances dissolved in it.

(b) Membranes are made of organic molecules like proteins and lipids.

(c) Molecules soluble in organic solvents can easily pass through the membrane.

(d) Plasma membranes contain chitin sugar in plants.

 

Last modified: Tuesday, 15 June 2021, 11:26 AM