Biology Class 11 NCERT Solutions: Chapter 20 Locomotion and Movement Part 2 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Q: 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 vs Myosin
ActinMyosin
1Actin is a thin contractile protein.1Myosin is a thick contractile protein.
2It is present in light bands and is called an isotropic band. (I-band)2It is present in dark bands and is called an anisotropic band. (A-band)

(B) Red and White muscles

Red vs White Muscle Fibre
Red muscle fibreWhite muscle fibre
1Red muscle fibres are thin and smaller in size.1White muscle fibres are thick and larger in size.
2They are red in colour as they contain large amounts of myoglobin.2They are white in colour as they contain small amounts of myoglobin
3They contain numerous mitochondria.3They contain less number of mitochondria.
4They carry out slow and sustained contractions for a long period.4They carry out fast work for short duration.
5They provide energy by aerobic respiration.5They provide energy by anaerobic respiration.
6
Image Shows the Red Muscles
6
Image Shows the White Muscles

(C) Pectoral and Pelvic girdle

Pectoral vs Pelvic Gridle
Pectoral girdlePelvic girdle
1It is a skeletal support from where the forelimbs of vertebrates are attached.1It is a skeletal support form where the hind limbs of vertebrates are attached.
2It is composed of two

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

2It is composed of three bones, upper ileum, inner pubic, and ischium.
3
Image Shows the Pectoral Girdle
3
Image Shows the Pelvic Girdle

Q: 6. Match Column I with Column II:

Match Col 1 and 2 Ques
Column IColumn II
(A)Smooth muscle(i)Myoglobin
(B)Tropomyosin(ii)Thin filament
(C)Red Muscle(iii)Sutures
(D)Skull(iv)Involuntary

Answer:

Match Col 1 and 2
Column IColumn II
(A)Smooth muscle(iv)Involuntary
(B)Tropomyosin(ii)Thin filament
(C)Red Muscle(i)Myoglobin
(D)Skull(iii)Sutures

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

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.

Q: 8. How do you distinguish between a skeletal muscle and a cardiac muscle?

Answer:

Q_8_Table of Distinguish between Skeletal Muscle and Cardiac Muscle
Skeletal MuscleCardiac Muscle
1The cells of skeletal muscles are unbranched.1The cells of cardiac muscles are branched.
2Intercalated discs are absent.2The cells are joined with one another by intercalated discs that help in coordination or synchronization of the heartbeat.
3Alternate light and dark bands are present.3Faint bands are present.
4They are voluntary muscles.4They are involuntary muscles
5They contract rapidly and get fatigued in a short span of time.5They contract rapidly but do not get fatigued easily.
6.They are present in body parts such as the legs, tongue, hands, etc.
Image Shows the Skeletal Muscle
These muscles are present in the heart and control the contraction and relaxation of the heart.
Image Shows the Cardiac Muscle

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