Advertisements
Advertisements
प्रश्न
Answer in detail.
Name the different classes of arthropods. Write one characteristic feature of each class.
Advertisements
उत्तर
Arthropods are invertebrates with jointed legs, a segmented body, and a bilaterally symmetrical body that is divided into head, thorax, and abdomen.
Anthropods are further classified into –
- Arachnids – They have fused head and thorax, four pairs of legs, hard exoskeleton, no wings, and antennae. Examples: Scorpions and spiders.
- Crustaceans – They have fused head and thorax, appendages on all segments, a variable number of jointed legs, and two pairs of antennae extending from the head. Examples: lobsters and sprimps.
- Myriapods – Body divided into a large number of segments and have two pairs of legs per segment (example: millipede) or one pair of legs per segment (Example: centipede). The number of legs may vary from 20 to 200.
- Insects – Their body is divided into head, thorax, and abdomen. They have three pairs of legs, two pairs of wings (some have one pair or none), and a pair of antennae. Examples: ants and butterflies.
APPEARS IN
संबंधित प्रश्न
Tick (✓) the appropriate answer:
The unicellular organism causing malaria
Differentiate between
flatworms and roundworms
State if the following statement is true or false. Correct the statement if it is false.
A tapeworm is a flatworm that lives in the human intestine.
Find the odd one out. Give reason.
ant, cockroach, spider, dragonfly
Write a short answer.
What is an exoskeleton? How is it different from a backbone?
Answer in detail.
You are asked to classify an animal in the correct group. The animal has a soft body and arm-like tentacles. You dissect the animal and find that it has an internal shell. Is the animal a cnidarian or a mollusc? Explain your answer.
Give reason for the following.
What happens to the body temperature of a fish when the temperature of water drops?
Given below are groups of animals, and their characteristics features. Some of the features are incorrect. Identify the odd one out in each.
| Group | Characteristic features | Odd one out |
| Porifera | porous animals, have tentacles, fixed to surface | |
| Amphibia | cold-blooded, lungs in adults, scaly skin | |
| Aves | cold-blooded, wings, feathers, bones with large air spaces | |
| Pisces | live in water, scaly skin warm-blooded, fins for swimming |
Mention any one major similarity and one major difference in the following pairs of an animal:
Wall lizard and Frog
How are the reproductive characteristics of mammals different from those of aves?
