Question

1. Movement is brought about by the contraction and relaxation of
a. bones
b. muscles
c. joints
d. cartilage

2. Which of these have the least number of movable joints?
a. Backbone
b. Skull
c. Legs and feet
d. Arms and hands

3. The total number of bones in the human skeleton are
a. 206
b. 196
c. 296
d. 106

4.Snail moves with the help of
a. Bone
b. Shell
c. Muscular foot
d. Whole body

5. Ribcage protects
a. Heart and lungs
b. Liver and spleen
c. Stomach and intestine
d. Kidney and liver

6. What are produced in bone marrow ?
a. White blood cells
b. Red blood cells
c. Platelets
d. All of these

7. Which one of the following shows slowest movement?
a. Earthworm
b. Cockroach
c. Ant
d. Snail

8. Fixed joint is found in
a. Cranium
b. Knee
c. Fingers
d. Elbow

Answer 1

Answer:

1)Muscles

2)Skull

3)206

4)Muscular foot

5)Heart and lungs

6)All of these

Naku 7,8 ravu

Answer 2

1.- b

2.-b.

3.- a

4.-c

5.- a

6.- d

7. d

8. a

Explanation:

• Muscle causes movement of body by contraction and relaxation . Actin and myosin work together to perform contraction
• Skull have 0 movable joints in order to protect the brain.
• Human skeleton have total of 206 bones.
• Snail have muscular foot through which they move.
• Ribs form ribcage  that surround lungs and heart to protect them,
• After birth, bone marrow is the site in which all blood cells formation takes place from a common hematopoietic stem cell.
• Cranium is the outer bony covering of brain to ensure stability  and protection of brain.