100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
CHAPTER-04 ANIMAL KINGDOM $9.99   Add to cart

Exam (elaborations)

CHAPTER-04 ANIMAL KINGDOM

 9 views  0 purchase
  • Course
  • Biology
  • Institution
  • Biology

CHAPTER-04 ANIMAL KINGDOM

Preview 2 out of 5  pages

  • August 29, 2024
  • 5
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • Biology
  • Biology
avatar-seller
lennyjast
CBSE Quick Revision Notes (Class-11 Biology)
CHAPTER-04 ANIMAL KINGDOM

Millions of species of animals have been described and it becomes more necessary to
classify them to assign a systematic position.
Animals are classified on the basis of arrangement of cells, body symmetry, nature of
coelom, pattern of digestive, circulatory and reproductive system.

Levels of organisation




Cellular Level Tissue Level Organ Level Oragn system Level

Sponges Cnidarians Platyhelminthes Arthropoda

Incomplete digestive system has one opening but in complete digestive system two opening
mouth and anus is present.
Open circulatory system- blood is pumped out of heart and cells and tissue are directly
bathed in it.
Closed circulatory system- blood is circulated through arteries, veins and capillaries.


Symmetry


Symmetrical Asymetrical
(can be divided into two equal (body is not divisible into equal
parts) halve)
eg.Amoeba, Sponges.

Radial Symmetry Bilateral Symmetry
(can be divided into eqaul halves by any plane (can be divided equal halves by only one plane)
passing through centre) eg. Star fish, hydra eg. all vertibrates.


The animals in which cells are arranged in two
embryonic layer, external ectoderm and internal
endoderm are called diploblastic. Eg. Porifera and
Cnidaria.

The animals in which developing embryo has a third
germinal layer, mesoderm besides ectoderm and
endoderm are called triploblastic. Eg. Platyhelminthes, Chordates.




Portal for CBSE Notes, Test Papers, Sample Papers, Tips and Tricks

, The body cavity which is lined by mesoderm is called coelom.
Animals possessing coelom are called coelomate (Annelida,
Chordates, Mollusca). In some animals cavity is not lined by
mesoderm but scattered as pouches in between ectoderm and
endoderm, are called pseudo-coelomates (Aschelminthes).
The animals in which body cavity is absent are called
acoelomate (Platyhelminthes).

In some animals, body is externally and internally divided into
segments with serial repetition as in earthworm, called metameric segmentation.
CLASSIFICATION OF ANIMALS
1. Phylum Porifera-
• Members of this phylum are commonly known as sponges. Mostly marine, asymmetrical and
have cellular level of organization.
• They have water transport or canal system. Water enters through minute pores, Ostia into
central cavity Spongocoel, from where it goes out through Osculum.
• Nutrition, respiration and excretion is performed by pathway of water transport system.
• Skeleton made up of spicules or spongin fibres.
• Egg and sperms are produced by same organism (hermaphrodite). Asexual reproduction by
fragmentation and sexual reproduction by gametes formation.
• Fertilisation internal and development is indirect.
• Example- Sycon, Spongilla.
2. Phylum Cnidaria ( Coelenterate)-
• They are aquatic, mostly marine, sessile, free swimming, radially symmetrical animals.
• They exhibit tissue level of organization, diploblastic, coelomate with single opening.
• They show two types of body called polyp and medusa.
• Polyp is sessile, fixed, and cylindrical, without gonads such as Hydra, Adamsia and Medusa is
free swimming, umbrella like having four gonads like Aurelia and Jelly fish.
• Some cnidarians exhibits both forms (Obelia), polyp produce medusa asexually and medusa
produce polyp sexually.
3. Phylum Ctenophora-
Commonly known as the Comb Jellies or Sea Walnuts.
Exclusively marine, diploblastic, radially symmetrical, with tissue level of organization.
Body bears eight ciliated comb plates which help in locomotion.
Bioluminescence (to emit light) is present in Ctenophores.
Hermaphrodite, fertilisation external, development indirect,
Example- Ctenoplana, Pleurobranchia.
4. Phylum Platyhelminthes (The Flat worms)
Dorso-ventrally flattened body, bilaterally symmetrical, triploblastic, acoelomate with
organs levels of organization.




Portal for CBSE Notes, Test Papers, Sample Papers, Tips and Tricks

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

Guaranteed quality through customer reviews

Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.

Quick and easy check-out

Quick and easy check-out

You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.

Focus on what matters

Focus on what matters

Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!

Frequently asked questions

What do I get when I buy this document?

You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.

Satisfaction guarantee: how does it work?

Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.

Who am I buying these notes from?

Stuvia is a marketplace, so you are not buying this document from us, but from seller lennyjast. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for $9.99. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

64438 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy study notes for 14 years now

Start selling
$9.99
  • (0)
  Add to cart