The correct answer is (ii) hinge joint. Hinge joints permit movement mainly in one plane, allowing bending and straightening actions. The knee and ankle joints work like door hinges, providing controlled movement and stability. These joints help in activities such as walking, running, jumping and maRead more
The correct answer is (ii) hinge joint. Hinge joints permit movement mainly in one plane, allowing bending and straightening actions. The knee and ankle joints work like door hinges, providing controlled movement and stability. These joints help in activities such as walking, running, jumping and maintaining posture while limiting unnecessary sideways movements that could cause injury.
For more NCERT Solutions of Class 9 Science Exploration Chapter 3 Tissues in Action Question Answer (2026-27)
A.(iii) Epithelium supports gas exchange, but lungs have thin simple epithelium, not multiple tall layers. B. (i) Cardiac muscles resist fatigue because of many mitochondria and rich blood supply. C. (iv) Tendons connect muscles to bones, not bones to bones. D. (iii) Hinge joints move mainly in oneRead more
A.(iii) Epithelium supports gas exchange, but lungs have thin simple epithelium, not multiple tall layers.
B. (i) Cardiac muscles resist fatigue because of many mitochondria and rich blood supply.
C. (iv) Tendons connect muscles to bones, not bones to bones.
D. (iii) Hinge joints move mainly in one plane, but they do not allow sliding in all directions like ball and socket joints.
For more NCERT Solutions of Class 9 Science Exploration Chapter 3 Tissues in Action Question Answer (2026-27)
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)
(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)
Which type of joint is involved when you bend your knees and ankles? (i) Ball and socket (ii) Hinge (iii) Pivot
The correct answer is (ii) hinge joint. Hinge joints permit movement mainly in one plane, allowing bending and straightening actions. The knee and ankle joints work like door hinges, providing controlled movement and stability. These joints help in activities such as walking, running, jumping and maRead more
The correct answer is (ii) hinge joint. Hinge joints permit movement mainly in one plane, allowing bending and straightening actions. The knee and ankle joints work like door hinges, providing controlled movement and stability. These joints help in activities such as walking, running, jumping and maintaining posture while limiting unnecessary sideways movements that could cause injury.
For more NCERT Solutions of Class 9 Science Exploration Chapter 3 Tissues in Action Question Answer (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-3/
See lessIn each of the following cases (A, B, C and D), choose the correct option as given below: (i) Both (A) and (R) are true and (R) is the correct explanation of (A). (ii) Both (A) and (R) are true, but (R) is not the correct explanation of (A). (iii) (A) is true, but (R) is false. (iv) (A) is false, but (R) is true. A. Assertion: Epithelium is well-suited for gas exchange in the lungs. Reason: It consists of multiple layers of tall cells that slow down diffusion. B. Assertion: Cardiac muscle can contract continuously without fatigue. Reason: Cardiac muscle cells have a high number of mitochondria and an abundant blood supply. C. Assertion: Tendons connect bone to bone and allow joint movement. Reason: Tendons are made of tough connective tissue that transmits force from muscle to bone. D. Assertion: In a hinge joint, movement occurs primarily in one plane. Reason: The bone ends are shaped to allow sliding in all directions
A.(iii) Epithelium supports gas exchange, but lungs have thin simple epithelium, not multiple tall layers. B. (i) Cardiac muscles resist fatigue because of many mitochondria and rich blood supply. C. (iv) Tendons connect muscles to bones, not bones to bones. D. (iii) Hinge joints move mainly in oneRead more
A.(iii) Epithelium supports gas exchange, but lungs have thin simple epithelium, not multiple tall layers.
B. (i) Cardiac muscles resist fatigue because of many mitochondria and rich blood supply.
C. (iv) Tendons connect muscles to bones, not bones to bones.
D. (iii) Hinge joints move mainly in one plane, but they do not allow sliding in all directions like ball and socket joints.
For more NCERT Solutions of Class 9 Science Exploration Chapter 3 Tissues in Action Question Answer (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-3/
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 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 less