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Have you wondered how much of your body weight comes from bones?
In an average adult human, bones contribute nearly 12–15 percent of total body weight, though this may differ with age, gender and physical condition. Bones form the skeletal framework of the body, providing strength, support and protection to internal organs. They also help maintain posture and worRead more
In an average adult human, bones contribute nearly 12–15 percent of total body weight, though this may differ with age, gender and physical condition. Bones form the skeletal framework of the body, providing strength, support and protection to internal organs. They also help maintain posture and work with muscles and joints to produce movement.
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 lessWhat percentage of total body weight comes from bones and muscles?
In adults, bones generally make up about 12–15 percent of total body weight. Muscle mass varies with gender, age and fitness, averaging 40–50 percent in males and 30–40 percent in females. Bones provide support and protection, while muscles produce movement. Together, they form the musculoskeletal sRead more
In adults, bones generally make up about 12–15 percent of total body weight. Muscle mass varies with gender, age and fitness, averaging 40–50 percent in males and 30–40 percent in females. Bones provide support and protection, while muscles produce movement. Together, they form the musculoskeletal system, which maintains posture, body structure and physical activity efficiently.
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 lessDiscuss why do bone and muscle mass differ between individuals and how do they contribute to the overall body weight?
Bone and muscle mass vary among individuals due to differences in age, gender, diet, exercise, hormones and genetics. Regular physical activity increases muscle strength and bone density. Bones provide structure, support and protection to organs, while muscles enable movement and maintain posture. TRead more
Bone and muscle mass vary among individuals due to differences in age, gender, diet, exercise, hormones and genetics. Regular physical activity increases muscle strength and bone density. Bones provide structure, support and protection to organs, while muscles enable movement and maintain posture. Together, bones and muscles form a major part of body weight and contribute to fitness and mobility.
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 lessWhat is Agrobacterium tumefaciens?
Agrobacterium tumefaciens is a soil bacterium responsible for crown gall disease in plants, causing tumour-like swellings through uncontrolled cell division. It transfers part of its genetic material into plant cells. Scientists later used this natural ability in genetic engineering and plant tissueRead more
Agrobacterium tumefaciens is a soil bacterium responsible for crown gall disease in plants, causing tumour-like swellings through uncontrolled cell division. It transfers part of its genetic material into plant cells. Scientists later used this natural ability in genetic engineering and plant tissue culture to develop improved crops, disease-resistant varieties and useful phytochemical-producing plants successfully.
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 lessMeristematic tissues divide repeatedly. What property of their cells allows them to do this? (i) They have thick walls for protection. (ii) They contain large vacuoles that store nutrients. (iii) They have thin walls, dense cytoplasm and large prominent nucleus. (iv) They are functionally differentiated cells.
The correct answer is (iii) thin walls, dense cytoplasm and large prominent nucleus. Meristematic cells remain actively involved in repeated cell division. Thin walls allow easy division, dense cytoplasm supports high metabolic activity and the large nucleus controls growth and cell functions efficiRead more
The correct answer is (iii) thin walls, dense cytoplasm and large prominent nucleus. Meristematic cells remain actively involved in repeated cell division. Thin walls allow easy division, dense cytoplasm supports high metabolic activity and the large nucleus controls growth and cell functions efficiently. These characteristics help plants grow continuously in roots, shoots and other growing regions.
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 less