Name: Locomotion in an Earthworm
Uploaded: 2019-07-19
Duration: 2 min 46 s
Description: Earthworms move underground by the means of waves of muscular contractions called peristalsis. Learn more about locomotion in earthworms in this video.

Question

Complete the crossword puzzle:

Down:
1. Flowers of this plant shows nastic movements
3. This insect has powerful hind legs for jumping
4. A flightless bird
5. A mode of flight in large birds such as vultures
6. Special structures that help earthworm in moving
Across:
2. Forelimbs of seals and walruses are modified as _____
7. A bone in the arm (sounds funny!)
8. Also called sleep movements

Accepted Answer

Nastic movements are plant movements that occur in response to environmental stimuli but unlike tropic movements, the direction of the response is not dependent on the direction of the stimulus.
Insects like grasshopper, flea and locusts have powerful hind legs for jumping.

Flightless bird, any of several birds that have, through evolution, lost the ability to fly as they adapted to new environments. The largest flightless bird, which is also the largest living bird, is the ostrich.
Vultures and eagles exhibit gliding and soaring modes of flight.
An earthworm moves using circular and longitudinal muscles, as well as bristles called setae. The earthworm can push the setae out of its body to grab the soil around it. To move forward, the worm uses its setae to anchor the front of its body and contracts the longitudinal muscles to shorten its body.

Seals are best-known for having long, streamlined forelimb flippers, much like those of a dolphin. Flippers and fins are great for steering and swimming.
The humerus is the bone that forms the upper arm, and joins it to the shoulder and forearm.
Nastic movement maybe seen in daisy flowers, which close at dusk and open at day break and is also referred to as sleep movements.

Chapter-Wise 3D Biology Videos from P A Paulose New Oxford Modern Science Biology Class 7

Locomotion in an Earthworm

Components of the Axial Skeleton

Joint and Its Types

Learn and Prepare for any exam you want !