Back to Course

SS2: BIOLOGY - 1ST TERM

0% Complete
0/0 Steps
  1. Classification of Plants | Week 1
    3 Topics
    |
    2 Quizzes
  2. Digestive System I | Week 2
    4 Topics
    |
    1 Quiz
  3. Digestive System II | Week 3
    4 Topics
    |
    1 Quiz
  4. Transport System I | Week 4
    5 Topics
    |
    1 Quiz
  5. Transport System II | Week 5
    3 Topics
  6. Transport System III | Week 6
    1 Topic
  7. Mechanism of Transportation in Higher Animals | Week 7
    3 Topics
    |
    1 Quiz
  8. Transport in Plants | Week 8
    2 Topics
  9. Experiment to Demonstrate the Flow of Materials in Plants | Week 9
    2 Topics
    |
    1 Quiz
  10. Respiratory System | Week 10
    2 Topics



Lesson 3, Topic 1
In Progress

Alimentary Systems of Different Animals

Lesson Progress
0% Complete

Topic Content:

  • Alimentary Canal in Lower Animals
  • Alimentary Canal of Insects
  • Digestive Tract of a Bird
  • Digestive Tract of a Rabbit

Alimentary Canal in Lower Animals:

Planaria:

The planaria are free-living flatworms which are found on the bottom of freshwater lakes and streams and in certain moist land habitats.

They have a digestive system that consists of a pharynx, mouth, and small intestine. The small intestine has three branches, one anterior leading forward to the head and two posteriors leading towards the tail end. The gastrovascular cavity (anterior and posterior intestines) is lined with phagocytic cells, glandular storage cells and gland cells. These branches break off into numerous side branches.

The alimentary canal has only one opening to the environment. This opening serves as both mouth and anus.

Planaria are carnivorous in diet and feed on small organisms like crustaceans, larvae and small worms in the streams.

They capture their prey by entangling them in mucus glands. The entangled prey is then wrapped with the body of the planarian and the pharynx is then extended from the mouth which sucks in the small bits of the prey into the small intestine.

 

You are viewing an excerpt of this Topic. Subscribe Now to get Full Access to ALL this Subject's Topics and Quizzes for this Term!

Click on the button "Subscribe Now" below for Full Access!

Subscribe Now

Note: If you have Already Subscribed and you are seeing this message, it means you are logged out. Please Log In using the Login Button Below to Carry on Studying!

Responses

Your email address will not be published. Required fields are marked *

error: Alert: Content selection is disabled!!