Tag: locomotion in animals

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Questions Related to locomotion in animals

Multiple choice biology movement and locomotion in man locomotion in animals bones and movements muscle contraction

An example of chitinous exoskeleton is

  1. Oriole

  2. Sea stars

  3. Clam

  4. Honeybee

  5. Earthworm
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

  • A tough, semitransparent substance that is the main component of the exoskeletons of arthropods, such as the shells of crustaceans and the outer coverings of insects(honey bee). 
  • Chitin is also found in the cell walls of certain fungi and algae. Chemically, it is a nitrogenous polysaccharide (a carbohydrate). Hence, An example of a chitinous exoskeleton is Honeybee.
So, the correct answer is 'Honeybee'.

Multiple choice biology movement and locomotion in man locomotion in animals bones and movements muscle contraction

Cockroaches have an outer skeleton.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
An exoskeleton is the external skeleton that supports and protects an animal's body. Examples of animals with exoskeletons include insects such as grasshoppers and cockroaches, and crustaceans such as crabs and lobsters.
Cockroaches are winged insects found in nearly every part of the world. Like most other insects, cockroaches have an exoskeleton, meaning their skeleton is located on the outside of their bodies. They have three simple body parts: the head, thorax, and abdomen.
Hence, the answer is true.
Multiple choice biology skeleton and movements locomotion in animals bones and movements muscle contraction

EDTA injected into muscles combines with $Ca^{2+}$ and

  1. Stops contraction

  2. Causes contraction

  3. Slows down contraction

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
  • Active sites for myosin are present on actin which are masked by troponin in resting state. When  Ca++ level increases it leads to the binding of calcium with a subunit of troponin on actin(thin) filaments and thereby remove the masking of active sites for myosin.
  • Utilizing the energy from ATP hydrolysis, the myosin head now binds to the exposed active sites on actin to form a cross bridge. 
  • This pulls the attached actin filaments towards the centre of ‘A’ band.
  •  The ‘Z’ line attached to these actins are also pulled inwards thereby causing a shortening of the sarcomere, i.e., contraction.
  • When EDTA  injected into muscles combines with Ca ++ and prevents the binding of calcium with troponin and slows down contraction.
  • So, the correct answer is 'Slows down contraction'.