Biology Class 11 NCERT Solutions: Chapter 20 Locomotion and Movement Part 2

Download PDF of This Page (Size: 467K)

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
Actin vs 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. (I-band)

2

It is present in dark bands and is called an anisotropic band.(A-band)

(B) Red and White muscles

Red vs White Muscle Fibre
Red vs White Muscle Fibre

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.

6

Image shows the red muscles

Image Shows the Red Muscles

Image shows the red muscles

6

Image shows the White muscles

Image Shows the White Muscles

Image shows the White muscles

(C) Pectoral and Pelvic girdle

Pectoral vs Pelvic Gridle
Pectoral vs Pelvic Gridle

Pectoral girdle

Pelvic girdle

1

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

1

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

2

It is composed of two

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

2

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

3

Image shows the Pectoral girdle

Image Shows the Pectoral Girdle

Image shows the Pectoral girdle

3

Image shows the Pelvic girdle

Image Shows the Pelvic Girdle

Image shows the Pelvic girdle

Q: 6. Match Column I with Column II:

Match Col 1 and 2 Ques
Match col 1 and 2 Ques

Column I

Column 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
Match col 1 and 2

Column I

Column 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
Q_8_Table of Distinguish Between Skeletal Muscle and Cardiac Muscle

Skeletal Muscle

Cardiac Muscle

1

The cells of skeletal muscles are unbranched.

1

The cells of cardiac muscles are branched.

2

Intercalated discs are absent.

2

The cells are joined with one another by intercalated discs that help in coordination or synchronization of the heartbeat.

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.

Image shows the skeletal muscle

Image Shows the Skeletal Muscle

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

Image Shows the Cardiac Muscle

Image shows the cardiac muscle

.