Yes, we can consciously control voluntary movements using skeletal muscles attached to bones. Actions like walking, writing and lifting objects occur when the nervous system sends signals to skeletal muscles, causing coordinated movement in different body parts.
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The body senses, communicates and responds through nervous tissue. Neurons receive signals from receptors, process information in the brain and spinal cord, then transmit messages to muscles or organs, enabling quick and coordinated responses to stimuli.
Bones contribute about 12–15 percent of an adult human’s body weight. This percentage may vary depending on age, gender and body composition. Bones provide support, protection, posture and structure, forming the framework of the musculoskeletal system.
Bones contribute about 12–15 percent of body weight in adults. Muscles contribute nearly 30–50 percent in males and 30–40 percent in females. Together, bones and muscles form the musculoskeletal system that supports movement and posture.
The correct option is (ii) phloem. Phloem transports food prepared in leaves to roots and other plant parts. Malfunctioning phloem disrupts movement of sugars and nutrients, affecting growth, storage and normal metabolic activities in plants.