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Important questions based on NCERT syllabus for Chapter 8 - Body Movements:
Question-1: Write the functions of skeleton in human body?
Solution: The human skeleton consists of 206 bones. When put together, the skeletal system provides the base framework to which all the other tissues and organs attach, giving shape to the human body. The human skeleton has two distinct features, including opposable thumbs and an erect structure, allowing you to walk on two legs. The skeletal system is divided into two parts, the axial skeleton, made up of your spine, ribs, skull and breastbone, and the appendicular skeleton, made up of your pelvis, arm and leg bones. The skeleton has five main functions. Skeleton perform functions like forming framework of the body, support and protect soft body parts, movement of body and production of RBC.
Question-2: What is a joint?
Solution: A joint is the location at which bones connect. They are constructed to allow movement (except for skull, sacral, sternal, and pelvic bones) and provide mechanical support, and are classified structurally and functionally.
Question-3: Why don't plants move, while animals do?
Solution: Plants have thick cell walls, rooted and they have very developed dispersal mechanisms. In this regard seeds are the obvious example, but just consider how grass seeds spread. Finally plants are autotrophs; they can synthesize their own food. But in case of animals, they move because they are heterotrophs and in search of food they need to migrate from, one place to other. And also to escape from enemies and predators and to find their mate for reproduction they need to migrate.