class 9 worksheet

1	Name the cell organelle which is termed as powerhouse of the cell.	1
2	Identify the single celled organisms from the following: Cockroach, Chlamydomonas, snake, mosquito, bacteria	1
3	Write any two differences between prokaryotic and eukaryotic cells.	1
4	When a living plant cell loses water through osmosis, there is contraction of the contents of the cell away from the cell wall. What is this phenomenon called?	1
5	What is the chemical composition of cell wall in plants and fungi?	1
6	Name the functional unit of DNA that carries genetic information.	1
7	Why is nucleus called “director of the cell”?	1
8	Name the cell organelle which is able to destroy a damaged cell.	1
9	In which parts of the plant are chromoplasts found ?	1
10	What is plasmolysis?	1

11	A plant cell is placed in a hypotonic solution. What will happen? Will the cell burst? Why or why not ?	2
12	List two main functions of plasma membrane.	2

13	Draw the diagram of a plant cell and label any three parts which make it different from an animal cell.	3
14	Distinguish between hypotonic solution, isotonic solution and hypertonic solution.	3
15	What is the difference between plasma membrane and cell wall? Give the functions of each one. OR State three differences between cell membrane and cell wall.	3
16	Define the following terms: Protoplasm, cytoplasm, nucleoplasm	3
17	Grass looks green, papaya appears yellow. Which cell organelle is responsible for this?	3
18	Differentiate between diffusion and osmosis.	3
19	Name: (a) An organelle which has its own genetic material (b) An organelle rich in digestive enzymes (c) Nucleic acid present in nucleus of cell	3

20	What are the main functions of each of the following cell components? (a) Plasma membrane (b) Chromosomes (c) Lysosomes (d) Ribosomes (e) Nucleus (f) Mitochondria (g) Nucleolus (h) Cell wall (i) Chloroplast ( j) Peroxisomes	5