11th Standard Syllabus & Materials

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11th Standard Zoology - Locomotion and Movement Three Marks Questions

Published on: 10/10/2019

Zoology - Locomotion and Movement

Download Tamil Nadu 11th Standard Biology question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.

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Std: 11th Standard - Biology

chapter: - Model Question paper

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Questions:

Generic 3

10 x 3 = 30

An exhausted student was attending a lecture. After 30 minutes or so, he lost interest and he let go with a tremendous yawn. To his great distress he couldn't close his mouth-his lower jaw was locked open. What do you think would have caused it?

Differentiate between A - band and I - band.

Differentiate between actin and myosin filament.

What are synovial joints?

Differentiate pelvis of male and female

What are Cartilaginous joints

What are the functions of the vertebral column?

Name the regions of the vertebral column and the number of vertebrae present in them

Distinguish Red muscle fibres and white muscle fibres.

10.

How does an isotonic contraction take place?

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Answers Key:

Generic 3

10 x 3 = 30

Sometimes the jaw remains open and does not close after yawning. This is due to dislocation of temporomandibular joint located between the temporal bone and mandible (hinge joint).

S.No	A-Band	I-Band
1.	It consists of myosin filament	It consists of actin filament.
2.	It has a dark appearance.	It has a light appearance.
3.	It is a anisotropic band.	It is a isotropic band.

S.No	Actin Filament	Myosin Filament
1.	They are thin	They are thick.
2.	Cross-bridges are not seen.	Cross-bridges are seen.
3.	They occur in I-band.	They occur in A- band.
4.	It has low molecular weight	It has high molecular weight
5.	It is a globular protein	It is an polymerized protein.

Synovial joints or Diarthroses joints: They are freely movable joints. The articulating bones are separated by a cavity which is filled with synovial fluid. Eg: Pivot joint - Between atlas and axis

The pelvis of male is deep and narrow with larger heavier bones and the female is shallow, wide and flexible in nature, and this helps during pregnancy which is influenced by female hormones.

Cartilaginous joints or Amphiarthroses: They are slightly movable joints in which the joint surfaces are separated by a cartilage and slight movement is only possible

The vertebral column protects the spinal cord, supports the head and serves as the point of attachment for the ribs and musculature of the back.

Cervical - 7 vertebrae
Thoracic - 12 vertebrae
Lumbar - 5 vertebrae
Sacrum - 5 fused vertebrae
Coccyx - 4 fused vertebrae
A total of 33 Vertebrae are present in vertebral column

Red muscle fibres	White muscle fibres
1. They are dark red in colour due to presence of abundant myoglobin	They are Whitish since they have less myoglobin
2. Mitochondria are more in number but they have less sarcoplasmic reticulum.	Mitochondria are less in number but they have more sarcoplasmic reticulum.
3. They depend on aerobic process for energy.	They depend on anaerobic process for energy.

10.

Isotonic contraction (iso-same, tonweight/ resistance)
1. In isotonic contraction the length of the muscle changes but the tension remains constant.
2. Here, the force produced is unchanged.
3. Eg: Lifting dumbbells and weight lifting.