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HOTS Questions: Skeletal & Muscular System | Science Class 5 PDF Download

Q1: Which of the following statements is true regarding the skeletal system?
(a) Bones are rigid and immovable.
(b) Bones provide a framework for the body and protect internal organs.
(c) The skeletal system is not involved in the production of blood cells.
(d) Bones do not store minerals like calcium and phosphorus.
Ans:
(b)
The skeletal system is not just a rigid structure; it serves as a framework for the body, providing support and protection to internal organs such as the heart, lungs, and brain. Additionally, bones play a vital role in the production of red blood cells, white blood cells, and platelets in the bone marrow. Moreover, bones act as a mineral reservoir, storing essential minerals like calcium and phosphorus.

Q2: During a basketball game, a player jumps to shoot the ball into the hoop. Which type of muscle is primarily responsible for this movement?
(a) Cardiac muscle
(b) Smooth muscle
(c) Skeletal muscle
(d) Involuntary muscle
Ans:
(c)
Skeletal muscles are attached to bones and are responsible for voluntary movements like jumping, running, and shooting a basketball. Cardiac muscles make up the heart and are involuntary, while smooth muscles are found in organs like the stomach and are also involuntary.

Q3: Why do our bones change their shape and size over time?
(a) Due to excessive physical activities
(b) Due to variations in diet
(c) Due to constant wear and tear
(d) Due to seasonal changes
Ans:
(c)
Our bones undergo a process called remodeling, where they change their shape and size over time due to constant wear and tear. As we engage in physical activities, bones adapt to handle the stress placed on them, resulting in changes to their structure and size. This process helps in maintaining bone strength and efficiency.

Q4: Which of the following joints allows rotational movement?
(a) Hinge joint
(b) Ball-and-socket joint
(c) Gliding joint
(d) Pivot joint
Ans:
(d)
A pivot joint allows rotational movement around its axis, much like a door hinge. This type of joint can be found in the neck, allowing us to rotate our head from side to side.

Q5: What happens when the muscular system and skeletal system work together during physical activities?
(a) Muscles relax, and bones become rigid.
(b) Muscles provide support, and bones contract.
(c) Muscles contract, and bones act as levers.
(d) Muscles become rigid, and bones provide flexibility.
Ans:
(c)
When the muscular system and skeletal system work together, muscles contract and generate force, while bones act as levers to create movement. This interaction enables various physical activities, like lifting objects, running, or even simple actions like bending and stretching.

Q6: Which of the following is a function of the muscular system beyond locomotion and movement?
(a) Maintaining body temperature
(b) Producing red blood cells
(c) Providing a rigid framework for the body
(d) Producing digestive enzymes
Ans:
(a)
The muscular system plays a crucial role in maintaining body temperature. During physical activities, muscles generate heat, helping to regulate body temperature and prevent overheating.

Q7: In which situation would the skeletal system experience the most stress and adaptation?
(a) Walking on a flat surface
(b) Climbing steep stairs
(c) Sitting at a desk
(d) Swimming in a pool
Ans:
(b)
Climbing steep stairs requires greater muscular effort and stress on the skeletal system compared to the other options. The bones would experience more pressure and force, leading to increased adaptation and remodeling to handle the demands of this activity.

Q8: How do bones contribute to the immune system?
(a) Producing white blood cells
(b) Acting as a physical barrier against pathogens
(c) Storing antibodies for future use
(d) Facilitating the production of antigens
Ans:
(a)
Bones play a role in the immune system by housing the bone marrow, which is responsible for the production of white blood cells (WBCs). White blood cells are essential components of the immune system that help fight off infections and protect the body from harmful pathogens.

Q9: Which pair of bones in the human body allow for the movement of the forearm, such as bending and straightening the elbow?
(a) Femur and tibia
(b) Radius and ulna
(c) Scapula and clavicle
(d) Humerus and metacarpals
Ans:
(b)
The radius and ulna are two bones in the forearm that allow for movement, specifically, the bending and straightening of the elbow joint.

Q10: Why do athletes engage in regular stretching exercises before and after sports activities?
(a) To increase bone density
(b) To improve muscular strength
(c) To reduce the risk of injuries
(d) To enhance heart rate and circulation
Ans:
(c)
Athletes engage in regular stretching exercises before and after sports activities to improve flexibility and reduce the risk of injuries. Stretching helps warm up the muscles, making them less prone to strains or tears during physical exertion. Additionally, post-activity stretching aids in muscle recovery and maintains flexibility, which can prevent stiffness and soreness.

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