Locomotion and Movement : 12th Class Biology Question Answer Lesson 16 – NIOS

Locomotion and Movement : 12th Class Biology Question Answer Lesson 16 – NIOS

Locomotion and Movement : 12th Class Biology Question Answer Lesson 16 - NIOS


What would you call the following as – movement (M) or locomotion (L) ?

  1. The elephant uses its trunks to pick up sticks – M
  2. The cow uses its tail to drive away flies – M
  3. A mouse runs into a hole. – L
  4. The bees leave their hive in search of pollen – L
  5. Johan kicks the football into the goal – M
  6. The cat jumps on to the window – L


  1. State the similarity in internal structure between a cilium and a flagellumas learnt in lesson 4 of your text book?
    Ans. Both made of microtubules arranged in a similar manner.
  2. What is an effective stroke ? Which stroke is called the recovery stroke as
    depicted during ciliary movement ?
    Ans. Fast stroke – cilium beats to move ahead
    Recovery stroke – cilium bends back to original position
  3. State the difference between flagella and cilia with regard to location and number
    Ans. Location – cilia all over body, flagella at anterior or posterior end
    Number – cilia many, flagella 1 or 2


  1. Name the structure that connects (i) a bone to another bone (ii) muscle to
    bone. Which type of tissue are these ?
    Ans. Ligament; tendon; connective tissue
  2. Why is the muscle cell also called muscle fibre ?
    Ans. because of its elongated structure
  3. Why is the mechanism of muscle contraction called ‘sliding movement’?
    Ans. because thick and thin myofilaments slide over each other to cause muscle contraction.
  4. What is the chemical composition of myofilaments.
    Ans. Protein
  5. In a muscle, where can you find the following ? myofilaments, muscle fibres.
    Ans. myofilaments in muscle fibre
    muscle fibres in muscle tissue


  1. Name an animal with endoskeleton and one with exoskeleton.
    Ans. any vertebrate named any insect / mollusc named
  2. Name main parts of skeleton and mention their functions.
    Ans. axial, appendicular support, protection to interanl organs; locomotion and movement; blood cells manufactured in bone marrow gives shape to body
  3. Name any two disorders of the musculo–skeletal system which are hereditary.
    Ans. Myaesthenia gravis; muscular dystrophy
  4. What causes osteoporesis and gout ? Plants and animals
    Ans. Osteoporosis – lack of Ca
    Gout – High level of uric acid in blood
  5. Which limbs are supported by which girdles and which kind of muscles are
    attached to the limb skeleton ?
    Ans. Pectoral – fore limbs; Pelvic – hind limb; Striped or striated


  1. Distinguish between the following pairs of terms:
    (i) movement and locomotion
    (ii) thick and thin myofilaments
    (iii) tendon and ligament
    (iv) cilia and flagella
    (v) tropic and nastic movement
  2. Enlist the steps in muscle contraction as explained by sliding filament theory.
  3. How does Paramecium swim in water?
  4. Answer in one word or sentence
    (i) What is the shape of actin molecule?
    (ii) What is the chemical nature of troponin and tropomyosin?
    (iii) What is meant by recovery stroke of cilia?
    (iv) Give an example each of geotropism and phototropism.
    (v) Why do we say that vertebrate muscle contraction is energy dependent?

NIOS 12th class biology Q Ans

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