Movements In Animals Book Back Questions 8th Science Lesson 19
8th Science Lesson 19
19] Movements In Animals
Book Back Questions with Answer and Do You Know Box Content
Do You Know?
Since snakes do not have legs, they use their muscles and their scales to move.
Fish have streamlined body structure which helps them to move smoothly with the flow of water. Muscles and fins on the body and the tail help to keep the balance.
Cheetah can run 76 kilometre per hour. Hippopotamus can run faster than a man. Cockroach is the fastest animal with 6 legs covering a metre per second. The fastest mammal, the Dolphin can swim upto 35 per hours.
Joints are the place where two bones meet or connect. Ligaments are short bands of tough fibrous connective tissues that function to connect one bone to another. Forming the joint. Tendons are made of elastic tissues and they also play a key role in the functioning of joints.
Inflammation of joints is a condition that usually results either due to friction of articulating cartilage or due to lack of synovial fluid in the joint. During this condition, the person feels acute pain in joints particularly while moving joints. This disease is referred to as arthritis. Arthritis is however also caused due to the deposition of uric acid crystals in the joints.
The femur or thighbone is the longest and strongest bone of the human skeleton. The stapes in the middle ear is the smallest and lightest bone of the human skeleton.
Humans and giraffes have the same number of bones in the necks, but the vertebrae in a giraffe’s neck are much, much larger.
There are muscles in the root of your hair that give you goose bumps. It takes 17 muscles to smile and 42 muscles to frown. The hardest working muscle is in eye.
Choose the best answers:
1. Which of the following parts of our body help us in movement?
(i) Bones (ii) Skin (iii) Muscles (iv) Organs
Choose the correct answer from the options below:
(a) (i) and (iii)
(b) (ii) and (iv)
(c) (i) and (iv)
(d) (iii) and (ii)
2. Which one of the following organisms lack muscles and skeleton for movement?
(a) Dog
(b) Snail
(c) Earthworm
(d) Human being
3. __________ joints are immovable.
(a) Shoulder and arm
(b) Knee and joint
(c) Upper jaw and skull
(d) Lower jaw and upper jaw
4. Why do underwater divers wear fin-like flippers on their feet?
(a) To swim easily in water
(b) To look like a fish
(c) To walk on water surface.
(d) To walk over the bottom of the sea (sea bed).
5. External ear (pinna) is supported by
(a) Bone
(b) Cartilage
(c) Tendon
(d) Capsule
6. Cockroach moves with the help of its
(a) Leg
(b) Bone
(c) Muscular foot
(d) Whole body
7. Which one of the following categories of vertebrae are correctly numbered?
(a) Cervical-7
(b) Thoracic-10
(c) Lumbar-4
(d) Sacral-4
Fill in the blanks:
1. Movement of organisms from place to place is called _________.
2. __________ refers to change in position of the part of an organism’s body.
3. A structure which provides rigid frame work to the body is called _____________.
4. Axil skeleton in human consists of ___________, ____________, _______________ and ______________.
5. Appendicular skeleton in human consists of __________ and _________.
6. The place where two bones meet is termed as ___________
7. __________ is attached to soft parts of the body like blood vessels, iris, bronchi and the skin.
8. _____________ muscle makes pupil of eyes wider.
State true or false. If false, correct the statement:
1. Skull in humans consists of 22 bones.
2. There are 12 pairs of ribs in human body.
3. Pelvic girdle is a part of axial skeleton.
4. Hinge joints is slightly movable joint.
5. Cardiac muscle is a voluntary muscle.
6. The flexor and extensor muscle of the arm are antagonistic muscles.
Answers:
Choose the best answers:
1. (i) and (iii) 2. Snail 3. Upper jaw and skull 4. To swim easily in water 5. Cartilage 6. whole body 7. Cervical-7
Fill in the blanks:
1. Locomotion 2. Movement 3. Skeleton 4. Skull facial bone, Sternum, rib, vertebral column
5. Pelvic, Pectoral girdle 6. Joint 7. Smooth muscle 8. Radial
State true or false. If false, correct the statement:
1.True
2.True
3.False
Correct answer: Pelvic girdle is a part of appendicular skeleton
4.True
5.False
Correct answer: Cardiac muscle is an involuntary muscle
6.True