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11th Standard English Medium Biology (Zoology) Subject Kingdom Animalia Creative 2 Mark Questions with Solution Part - I updated Creative Questions

Published on: 13/05/2022

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Std: 11th Standard - Biology

chapter: - Creative Questions

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Questions:

Generic 2

5 x 2 = 10

Name the larva of cnidarians?

Distinguish invertebrates and chordates.

Define asymmetry with example.

Define triploblastic animals with example.

What is Pseudocoel?

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Answers Key:

Generic 2

5 x 2 = 10

Planula larva

Invertebrates		Chordates
1.	The major group of animals which do not have notochord or vertebral column are Invertebrates	1.	The major group of animals which have notochord or vertebral column are chordates.
2.	These are lower animals.	2.	These are higher animals.

The simplest body plan is seen in sponges. They do not display symmetry and are asymmetryical. Such animals lack a definite body plan or are irregular shaped and any plane passing through the centre of the body does not divide them into two equal halves (Sponges).

Animals in which the developing embryo has three germinal layers are called triploblastic animals and consists of outer ectoderm (skin, hair, neuron, nail, teeth, etc), inner endoderm (gut, lung, liver) and middle mesoderm (muscle, bone, heart). Most of the triploblastic animals show organ system level of organisation (Flat worms to Chordates).

1. In some animals, the body cavity is not fully lined by the mesodermal epithelium, but the mesoderm is formed as scattered pouches between the ectoderm and endoderm.
2. Such a body cavity is called a pseudocoel and is filled with pseudocoelomic fluid. Animals that possess a pseudocoel are called pseudocoelomates Eg: Round worms.