G. Answer the following in short.
1. What are invertebrates?
2. What do you mean by radially symmetrical body?
3. What are the special organs of excretion in annelids?
4. What is an exoskeleton? How is it different from the backbone?
5. Which class of animals can live both on land and in water?
Give two examples.
6. Write three most important features of birds.
Answers
Answer:
Invertebrates don't have a backbone.
Radial symmetry means more than one plane of symmetry.
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Answer:
1.plural noun: invertebrates
an animal without a solid line of bones (backbone) going along its body
बिना रीढ़ का प्राणी, मेरुदंडरहित प्राणी
2.
a basic body plan in which the organism can be divided into similar halves by passing a plane at any angle along a central axis, characteristic of sessile and bottom-dwelling animals, as the sea anemone and starfish.
3.
The annelid excretory system is made up of long tubular organs called nephridia. Many species have a pair of nephridia in each segment.
4.
Exoskeleton Backbone
It is the external skeleton present on the outside of an animal as a hard outer coating. It is the internal skeleton present inside the body.
It is made up of scales, chitinous cuticle and calcified shells. It is made up of vertebrae.
5.
And there are many species which can easily live and survive in both land and water environment. Their biological systems are also customised for living on both land and water. Some examples are: Frogs, Crocodiles, Tortoise , Salamander and some species of water snakes etc.
6.5 Major Characteristics of Birds
Feathers. Feathers are the defining characteristic of Aves, found on every living species of bird and no other class of animal. ...
Wings. All birds have wings, although not all birds fly. ...
Beak. All birds have beaks, or bills, made of a bony core surrounded by a thin layer of keratin. ...
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