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Two 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 lessDifferentiate between the following pairs of terms based on the clues given in parentheses: (i) Cell membrane and cell wall (permeability) (ii) RER and SER (structure) (iii) Chloroplasts and chromoplasts (pigments)
Cell membrane is selectively permeable, controlling entry and exit of substances, while cell wall is freely permeable and provides support. Rough endoplasmic reticulum (RER) has ribosomes and appears rough, whereas smooth ER lacks ribosomes. Chloroplasts contain green chlorophyll for photosynthesis,Read more
Cell membrane is selectively permeable, controlling entry and exit of substances, while cell wall is freely permeable and provides support. Rough endoplasmic reticulum (RER) has ribosomes and appears rough, whereas smooth ER lacks ribosomes. Chloroplasts contain green chlorophyll for photosynthesis, while chromoplasts contain coloured pigments like red, yellow or orange for attraction.
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 cells monitor their growth to maintain a balance?
Cells maintain balance by regulating growth through controlled cell division, contact inhibition and programmed cell death (PCD). Contact inhibition stops cells from dividing when they touch others. PCD removes unnecessary or damaged cells. Together, these processes ensure proper growth, prevent oveRead more
Cells maintain balance by regulating growth through controlled cell division, contact inhibition and programmed cell death (PCD). Contact inhibition stops cells from dividing when they touch others. PCD removes unnecessary or damaged cells. Together, these processes ensure proper growth, prevent overcrowding and maintain healthy functioning of tissues and organs.
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 cells grow and reproduce forever?
Cells do not grow and reproduce indefinitely. They have a definite life span during which they grow, perform functions, divide and eventually die. This controlled cycle maintains balance in the body. Old or damaged cells are replaced by new ones. If this balance is disturbed, it may lead to diseasesRead more
Cells do not grow and reproduce indefinitely. They have a definite life span during which they grow, perform functions, divide and eventually die. This controlled cycle maintains balance in the body. Old or damaged cells are replaced by new ones. If this balance is disturbed, it may lead to diseases or abnormal conditions.
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 cancer cells grow and spread?
Cancer cells arise when normal control over cell division is lost. These cells divide uncontrollably, forming tumours. Malignant tumours can invade nearby tissues and spread to distant parts of the body through blood or lymph. This uncontrolled growth disrupts normal body functions and can become liRead more
Cancer cells arise when normal control over cell division is lost. These cells divide uncontrollably, forming tumours. Malignant tumours can invade nearby tissues and spread to distant parts of the body through blood or lymph. This uncontrolled growth disrupts normal body functions and can become life-threatening if not controlled.
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