Check here the Latest detailed Answers and Solutions as per the latest guidelines of Page No 314: - Chapter 20 Locomotion & Movement class 11 ncert solutions Biology - [2024-2025]

Page No 314: - Chapter 20 Locomotion & Movement class 11 ncert solutions Biology - SaraNextGen [2024-2025]

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On April 24, 2024, 11:35 AM

Question 4:

Write true or false. If false change the statement so that it is true.

(a) Actin is present in thin filament

(b) H-zone of striated muscle fibre represents both thick and thin filaments.

(d) There are 11 pairs of ribs in man.

(e) Sternum is present on the ventral side of the body.

Answer:

(a) Answer: True

(b) Answer: False

H -zone of striated muscle fibre is the central part of the thick filament that is not overlapped by the thin filament.

(c) Answer: True

(d) Answer: False

There are 12 pairs of ribs in a man.

(e) Answer: True

Question 5:

Write the difference between:

(a) Actin and Myosin

(b) Red and White muscles

(c) Pectoral and Pelvic girdle

Answer:

(a) Actin and Myosin

	Actin		Myosin
1	Actin is a thin contractile protein.	1	Myosin is a thick contractile protein.
2.	It is present in light bands and is called an isotropic band.	2	It is present in dark bands and is called an anisotropic band.

	Red muscle fibre		White muscle fibre
1	Red muscle fibres are thin and smaller in size.	1	White muscle fibres are thick and larger in size.
2	They are red in colour as they contain large amounts of myoglobin.	2	They are white in colour as they contain small amounts of myoglobin
3	They contain numerous mitochondria.	3	They contain less number of mitochondria.
4	They carry out slow and sustained contractions for a long period.	4	They carry out fast work for short duration.
5	They provide energy by aerobic respiration.	5	They provide energy by anaerobic respiration.

(b) Red and White muscles

Pectoral girdle

Pelvic girdle

It is a skeletal support from where the forelimbs of vertebrates are attached.

It is a skeletal support form where the hind limbs of vertebrates are attached.

It is composed of two

Bones namely, clavicle or collar bones and scapula or shoulder bone.

It is composed of three bones, upper ileum, inner pubic, and ischium.

(c) Pectoral and Pelvic girdle

Match Column I with Column II :Question 6:

	Column I		Column II
(a)	Smooth muscle	(i)	Myoglobin
(b)	Tropomyosin	(ii)	Thin filament
(c)	Red muscle	(iii)	Sutures
(d)	Skull	(iv)	Involuntary

	Column I		Column II
(a)	Smooth muscle	(iv)	Involuntary
(b)	Tropomyosin	(ii)	Thin filament
(c)	Red muscle	(i)	Myoglobin
(d)	Skull	(iii)	Sutures

Answer:

What are the different types of movements exhibited by the cells of human body?Question 7:

Answer:

Movement is a characteristic feature of living organisms. The different types of movement exhibited by cells of the human body are:

· Amoeboid movement: Leucocytes present in the blood show amoeboid movement. During tissue damage, these blood cells move from the circulatory system towards the injury site to initiate an immune response.

· Ciliary movement: Reproductive cells such as sperms and ova show ciliary movement. The passage of ova through the fallopian tube towards the uterus is facilitated by this movement.

· Muscular movement: Muscle cells show muscular movement.

Question 8:

How do you distinguish between a skeletal muscle and a cardiac muscle?

Answer:

	Skeletal muscle		Cardiac muscle
1.	The cells of skeletal muscles are unbranched.	1.	The cells of cardiac muscles are branched.
2.	Intercalated disks are absent.	2.	The cells are joined with one another by intercalated disks that help in coordination or synchronization of the heart beat.
3.	Alternate light and dark bands are present.	3.	Faint bands are present.
4.	They are voluntary muscles.	4.	They are involuntary muscles.
5.	They contract rapidly and get fatigued in a short span of time.	5.	They contract rapidly but do not get fatigued easily.
6.	They are present in body parts such as the legs, tongue, hands, etc.	6.	These muscles are present in the heart and control the contraction and relaxation of the heart.