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The cell membrane of a cell is made up of proteins and lipids. Which cell organelles help in the synthesis of cell membrane? Write the path of these compounds from their site of synthesis to the cell membrane and show this through a labelled diagram.
Proteins are synthesised in ribosomes on rough endoplasmic reticulum, while lipids are made in smooth endoplasmic reticulum. These materials are transported to the Golgi apparatus, where they are modified and packed into vesicles. The vesicles move to the cell membrane and fuse with it, forming membRead more
Proteins are synthesised in ribosomes on rough endoplasmic reticulum, while lipids are made in smooth endoplasmic reticulum. These materials are transported to the Golgi apparatus, where they are modified and packed into vesicles. The vesicles move to the cell membrane and fuse with it, forming membrane components.
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 lessWhat would happen if gametes are formed by mitotic divisions?
If gametes are formed by mitosis, they will contain the full set of chromosomes instead of half. During fertilisation, the chromosome number would double, leading to abnormal cells. This would disrupt genetic balance and cause serious developmental problems. Meiosis is essential to maintain the corrRead more
If gametes are formed by mitosis, they will contain the full set of chromosomes instead of half. During fertilisation, the chromosome number would double, leading to abnormal cells. This would disrupt genetic balance and cause serious developmental problems. Meiosis is essential to maintain the correct chromosome number in sexually reproducing organisms.
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 lessIf a synthetic cell is developed, what may be the related ethical issues?
The development of synthetic cells raises ethical concerns such as biosafety, misuse and environmental risks. Artificial life forms may escape control and harm ecosystems. There are also concerns about playing with natural life processes and moral responsibility. Proper regulations, monitoring and eRead more
The development of synthetic cells raises ethical concerns such as biosafety, misuse and environmental risks. Artificial life forms may escape control and harm ecosystems. There are also concerns about playing with natural life processes and moral responsibility. Proper regulations, monitoring and ethical guidelines are necessary to ensure safe use and prevent misuse of synthetic cell technology.
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 lessIdentify the pair that incorrectly matches the cell organelle with its function. (i) Ribosome – Protein synthesis (ii) SER — Lipid and cellulose synthesis (iii) Lysosome — Digestion of foreign agents
The incorrect match is (ii) SER — Lipid and cellulose synthesis. Smooth endoplasmic reticulum synthesises lipids but does not produce cellulose. Ribosomes correctly perform protein synthesis and lysosomes digest foreign substances and wastes. Therefore, option (ii) is incorrect, while the other pairRead more
The incorrect match is (ii) SER — Lipid and cellulose synthesis. Smooth endoplasmic reticulum synthesises lipids but does not produce cellulose. Ribosomes correctly perform protein synthesis and lysosomes digest foreign substances and wastes. Therefore, option (ii) is incorrect, while the other pairs are correctly matched with their functions.
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 lessA researcher carried out an experiment in which she took two carrots of similar size. She placed one carrot in plain water and the other carrot in concentrated salt solution (Fig. 2.21). After 24 hours she recorded her observations. (i) What hypothesis does she want to test through this experiment? (ii) What would you suggest for the improvement of this experiment? (iii) Why does the carrot in plain water stay stiff and crunchy, but the carrot in concentrated salt solution become rubbery and limp?
(i) The hypothesis is that osmosis causes water movement in cells. (ii) Use equal-sized carrots, measure initial and final weight and repeat trials for accuracy. (iii) In plain water, carrot cells gain water and become stiff due to turgor pressure. In salt solution, water leaves cells, causing themRead more
(i) The hypothesis is that osmosis causes water movement in cells.
(ii) Use equal-sized carrots, measure initial and final weight and repeat trials for accuracy.
(iii) In plain water, carrot cells gain water and become stiff due to turgor pressure. In salt solution, water leaves cells, causing them to shrink and become soft and limp.
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