Download App

Animal Kingdom — BIOLOGY STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYAnimal Kingdom3 Marks
Question
What is the basic body plan of animals?
✓

Answer

Animals have three basic body plan as given below:

  1. Cell aggregate body plan: Cells are loosely arranged and do not organise to form tissues, e.g., sponges.
  2. Blind sac body plan: Body has a cavity that helps in digestion with a single opening, the mouth, e.ge coelenterates.
  3. Tube within tube body plan: It is found in higher animal groups from nematodes to chordates. The body consists of two openings, i.e., one for ingestion and one for egestion.

It is further divided into two types:

  1. Protostomous plan: (Proto-first; stoma-mouth) found in non-chordates like flatworms, roundworms, annelids, molluscs and arthropods. In this, mouth is derived from the blastopore of the embryo and anus is formed later.

  2. Deuterostomous plan: It is found in echinoderms, hemichordata and chordates. In To this, anus is derived from the blastopore and mouth arises at the opposite end.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "3 Marks Question" from Animal Kingdom→Animal Kingdom — all question types→BIOLOGY STD 11 Science question papers→Rajasthan Board STD 11 Science question papers→Rajasthan Board question paper generator→

Similar questions

What is heterospory? Briefly comment on its significance. Give two examples.
→
An Rh-negative woman is carrying an Rh-positive foetus for the second time. Describe the consequences of Rh-incompatibility in this case?

OR

Why is it necessary to check the Rh-factor of the blood of a pregnant woman?

→
How is secondary growth accomplished in dicot roots? Explain with the help of schematic diagrams.
→
Succinic dehydrogenase is an enzyme that causes the substrate, succinate, to breakdown into fumarate.
Malonate is a substance that resembles succinate and inhibits the activity of succinic dehydrogenase.
  1. State the type of inhibition of succinic dehydrogenase by malonate.
  2. Explain how this type of inhibition affects the activity of the enzyme.
→
Write short notes on the function of the following hormone :
Thyroid hormone
→
Why do we consider blood as a connective tissue?
→
Explain the advantage of the complete partition of ventricle among birds and mammals and hence leading to double circulation.
→
Try to collect all the currently accepted meanings for the word ‘species’. Discuss with your teacher the meaning of species in case of higher plants and animals on one hand, and bacteria on the other hand.
→
Compare the following:
Resting potential and action potential
→
Give the schematic representation of an overall view of Krebs' cycle.
→