(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)
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)
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)
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)
In pure water, Cell X gains water through osmosis and swells. In concentrated salt solution, Cell Y loses water and shrinks. This occurs because water moves across the cell membrane from higher to lower water concentration. The correct explanation is option (iii): water moves into Cell X and out ofRead more
In pure water, Cell X gains water through osmosis and swells. In concentrated salt solution, Cell Y loses water and shrinks. This occurs because water moves across the cell membrane from higher to lower water concentration. The correct explanation is option (iii): water moves into Cell X and out of Cell Y through the cell membrane.
For more NCERT Solutions of Class 9 Science Exploration Chapter 2 Cell: The Building Block of Life (2026-27)
A 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 lessTwo similar animal cells are placed in two different solutions: Cell X is placed in pure water. Cell Y is placed in a concentrated salt solution. Cells are observed after some time. Cell X swells and Cell Y shrinks. Which statement provides the correct explanation for the above observations? (i) Salt molecules moved into Cell Y, causing it to shrink. (ii) Water moved into Cell X and more water moved out of Cell Y than the salt solution entered in it. (iii) Water moved into Cell X and moved out of Cell Y through the cell membrane. (iv) Solute movement caused osmosis in both cells.
In pure water, Cell X gains water through osmosis and swells. In concentrated salt solution, Cell Y loses water and shrinks. This occurs because water moves across the cell membrane from higher to lower water concentration. The correct explanation is option (iii): water moves into Cell X and out ofRead more
In pure water, Cell X gains water through osmosis and swells. In concentrated salt solution, Cell Y loses water and shrinks. This occurs because water moves across the cell membrane from higher to lower water concentration. The correct explanation is option (iii): water moves into Cell X and out of Cell Y through the cell membrane.
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