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Identify 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 lessWhich of the following pairs of cell organelles contains DNA? (i) Chloroplasts, Ribosomes (ii) Mitochondria, Nucleus (iii) Golgi bodies, Ribosomes (iv) Nucleus, Lysosome
The correct answer is (ii) Mitochondria and Nucleus. Both these organelles contain their own DNA. The nucleus stores most genetic information, while mitochondria have their own small circular DNA. Ribosomes, Golgi bodies and lysosomes do not contain DNA. Therefore, option (ii) correctly identifies oRead more
The correct answer is (ii) Mitochondria and Nucleus. Both these organelles contain their own DNA. The nucleus stores most genetic information, while mitochondria have their own small circular DNA. Ribosomes, Golgi bodies and lysosomes do not contain DNA. Therefore, option (ii) correctly identifies organelles that possess 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 lessMitochondria and chloroplasts are two important organelles in a plant cell. Discuss how these two organelles are structurally and functionally similar to each other and different from each other.
Mitochondria and chloroplasts are similar as both are double-membraned organelles with their own DNA and ribosomes. They can synthesise some proteins independently. However, mitochondria perform cellular respiration and release energy, while chloroplasts carry out photosynthesis and produce food usiRead more
Mitochondria and chloroplasts are similar as both are double-membraned organelles with their own DNA and ribosomes. They can synthesise some proteins independently. However, mitochondria perform cellular respiration and release energy, while chloroplasts carry out photosynthesis and produce food using sunlight. Thus, they differ functionally but share structural similarities and evolutionary origin.
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 lessTwo students, Renu and Rohit, were having a discussion on the plastids. Renu emphasised that all parts of the plants, even roots, contain plastids. However, Rohit did not agree with the statement and told her that plastids are absent in plant roots since the roots are underground and do not need to perform photosynthesis. Who is correct? Justify your answer.
Renu is correct because plastids are present in all plant parts, including roots. While roots do not perform photosynthesis and lack chloroplasts, they contain leucoplasts, which store food materials like starch. Plastids are not limited to photosynthesis; they perform various functions. Therefore,Read more
Renu is correct because plastids are present in all plant parts, including roots. While roots do not perform photosynthesis and lack chloroplasts, they contain leucoplasts, which store food materials like starch. Plastids are not limited to photosynthesis; they perform various functions. Therefore, plastids are present in roots, supporting Renu’s statement
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