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Draw a well-labelled schematic diagram of a plant or an animal cell using these clues — (i) Nucleus appears as a dark and round body inside the cell. (ii) ER spreads like a network of extended nuclear envelope. (iii) Mitochondria and chloroplasts are rod shaped.
A well-labelled diagram of a cell should include a dark, round nucleus at the centre, endoplasmic reticulum as a network extending from it and rod-shaped mitochondria and chloroplasts in plant cells. Other parts like cell membrane, cytoplasm and vacuole should also be shown clearly. Proper labellingRead more
A well-labelled diagram of a cell should include a dark, round nucleus at the centre, endoplasmic reticulum as a network extending from it and rod-shaped mitochondria and chloroplasts in plant cells. Other parts like cell membrane, cytoplasm and vacuole should also be shown clearly. Proper labelling helps in understanding cell structure and organisation effectively.
For more NCERT Solutions of Class 9 Science Exploration Chapter 2 Cell: The Building Block of Life (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-2/
See lessCan you identify which stage comes first during cell division?
The first stage of cell division is interphase. During this stage, the cell grows, carries out normal functions and duplicates its DNA. It prepares itself for division. After interphase, the cell enters mitosis, where actual division takes place. Interphase is important because it ensures that eachRead more
The first stage of cell division is interphase. During this stage, the cell grows, carries out normal functions and duplicates its DNA. It prepares itself for division. After interphase, the cell enters mitosis, where actual division takes place. Interphase is important because it ensures that each new cell receives the correct genetic material.
For more NCERT Solutions of Class 9 Science Exploration Chapter 2 Cell: The Building Block of Life (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-2/
See lessDo you observe the cells of the onion root tip? Are they similar in structure? Do you find any structural differences in these cells? If yes, why is it so?
Yes, onion root tip cells can be observed under a microscope. They are not all similar in structure because they are at different stages of cell division. Some cells may show chromosomes, while others may not. These differences occur because the cells are actively dividing and each stage of divisionRead more
Yes, onion root tip cells can be observed under a microscope. They are not all similar in structure because they are at different stages of cell division. Some cells may show chromosomes, while others may not. These differences occur because the cells are actively dividing and each stage of division shows different structural features.
For more NCERT Solutions of Class 9 Science Exploration Chapter 2 Cell: The Building Block of Life (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-2/
See lessHow do Normal Cells Grow and Divide?
Normal cells grow and divide through a controlled process called cell division. Cells first grow and then divide to form new cells. This helps in body growth, repair of damaged tissues and replacement of old cells. The process occurs in an organised manner to maintain proper functioning and balanceRead more
Normal cells grow and divide through a controlled process called cell division. Cells first grow and then divide to form new cells. This helps in body growth, repair of damaged tissues and replacement of old cells. The process occurs in an organised manner to maintain proper functioning and balance within the body.
For more NCERT Solutions of Class 9 Science Exploration Chapter 2 Cell: The Building Block of Life (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-2/
See lessInstead of many small ones, why does a cell not have a single giant mitochondrion? How does this relate to the concept of surface area?
Having many small mitochondria increases the total surface area available for cellular respiration. A larger surface area allows more chemical reactions to occur efficiently. If there were a single large mitochondrion, the surface area relative to volume would decrease, reducing efficiency. MultipleRead more
Having many small mitochondria increases the total surface area available for cellular respiration. A larger surface area allows more chemical reactions to occur efficiently. If there were a single large mitochondrion, the surface area relative to volume would decrease, reducing efficiency. Multiple mitochondria also ensure proper energy distribution across the cell, supporting all activities effectively.
For more NCERT Solutions of Class 9 Science Exploration Chapter 2 Cell: The Building Block of Life (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-2/
See less