Cbse class 9 biology important questions

1. Most Important Questions Class 9 Biology Unit Test

2. Most Important Questions

3. Most Important Questions 1 Mark Question Define osmosis. [1M]

4. Most Important Questions 1 Mark Question Define osmosis. [1M] Osmosis is a process in which there is a movement of solvent from a region of high concentration to a region of low concentration through a semipermeable membrane.

5. Most Important Questions 1 Mark Question Name the following tissues. [1M] • found in the iris of the eye • that connects two bones

6. Most Important Questions 1 Mark Question Name the following tissues. [1M] • found in the iris of the eye Unstriated muscles [1/2 M] (ii) that connects two bones Ligament [1/2 M]

7. Most Important Questions 2 Marks Question How are the following related to each other? [2M] • Chromatin network and chromosomes • Chloroplast and chlorophyll

8. Most Important Questions 2 Marks Question How are the following related to each other? [2M] • Chromatin network and chromosomes On cell division, chromatin network organize themselves into chromosomes. [1M] (ii) Chloroplast and chlorophyll Chloroplast is a plastid which contains a green pigment called chlorophyll which is responsible for photosynthesis. [1M]

9. Most Important Questions 3 Marks Question Answer the following: [3M] • Differentiate between epidermal and cork cells. • Why are they called protective tissues?

10. Most Important Questions 3 Marks Question Answer the following: [3M] • Differentiate between epidermal and cork cells. (ii) Why are they called protective tissues? • Protect the plants from mechanical injury and infection • Prevent loss of water

11. Most Important Questions 5 Marks Question Answer the following: [5M] • Name the following: • Cell organelle which permits selective entry and exit of materials in the cell. • Solution in which solute concentration is more than that inside the cell. • Fibrous polysaccharide which constitutes the cell wall. (ii) List the functions of the nucleus.

12. Most Important Questions 5 Marks Question Answer the following: [5M] • Name the following: • Cell organelle which permits selective entry and exit of materials in the cell – Cell membrane [1M] • Solution in which solute concentration is more than that inside the cell – Hypertonic solution [1M] • Fibrous polysaccharide which constitutes the cell wall – Cellulose [1M] (ii) Functions of the nucleus: (Any two points) • Controls all metabolic activities of the cell [1M] • Regulates the cell cycle [1M] • Controls the transmission of hereditary characteristics [1M]

13. Practice Questions Name the tissue which is responsible for increase in length of stem and root. [1M] What will happen if a plant cell is placed in a hypotonic solution? Will the cell [2M] burst? Why or why not? Differentiate between the three types of muscular tissues. [3M] Describe the structure and functions of mitochondria. Write two differences [5M] in function of mitochondria and chloroplasts.

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