Question

Q.5.09 a)What type of movement do flatworms have: (MCQ 1 point)

A) do the muscles in the body appear to contract rapidly to generate motion

B) motion is smooth and uninterrupted by contractions

b) Explain whythis is so, from your observations of the internal structure of the flatworm.   Word limit = 100 words

c) What type of motion do nematodes have: (MCQ 1 point)

A) smooth like the flatworms

B) jerky and whip-like as internal muscles contract rapidly and relax

C) an ‘inching’ motion, expanding and contracting along the length of the body like earthworms

d) Explain why this type of movement is possible. Word limit = 100 words

Answer 1

Q.5.09 - The correct answer is A. Do the muscles in the body appear to contract rapidly to generate motion.

A. Flat worms have ciliated ventral surface as the means of locomotion.

It also have both dorsal ventral muscle bands and ant/ posterior muscle bands. This helps in locomotion of flat worms. Proboscis also helps in locomotion of flat worms by contraction of circular and longitudinal circular muscles.

c. The correct answer is B. Jerky and whip like as internal muscles contract rapidly and relax.

Nematodes have internal muscle called longitudinal muscle which contracts rapidly and relax. This gives jerky and whip like movements. This nematodes doesn’t have flagella or cilia for locomotion.