Question 5.
Write the characters of each of the following animals with the help of classification chart.
Bath sponge, grasshopper, rohu, penguin, frog, lizard, elephant, jellyfish.
Answer:
1. Bath sponge: Phylum- Porifera
These animals are with simplest body plan and are called as ‘Sponges’. They bear numerous pores on their body. Those pores are called as ‘Ostia’ and ‘Oscula’. These are aquatic animals and are mostly asymmetrical.
2. Grasshopper: Phylum- Arthropoda
These animals have jointed appendages. Body of these animals is triploblastic, eucoelomate, bilaterally symmetrical and segmented.
3. Rohu: Phylum – Pisces
These are cold blooded aquatic animals living in marine and fresh waters. Their body is spindle shaped to minimize water-resistance. They have paired & un-paired fins for swimming. The tail fin is useful as a steering organ during swimming. They use gills for respiration.
4. Penguin: Phylum- Aves
These vertebrates are completely adapted for aerial life. These are warm blooded i.e. they can maintain their body temperature constant and their body is spindle-shaped to minimize air resistance during flight. Their forelimbs are modified into wings and the digits are covered with scales and bear claws. Exoskeleton is present in the form of feathers.
5. Frog: Phylum- Amphibia
These animals are strictly aquatic during larval life and perform only aquatic respiration whereas they can live in water as well as on land during adult life and can perform aquatic as well as aerial respiration. They have two pairs of appendages and their digits are without claws.
6. Lizard: Phylum- Reptilia
These are cold blooded animals. They creep on the land as their body cannot be lifted up. Their skin is dry and scaly.
7. Elephant: Phylum- Mammalia
Presence of mammary glands is typical character of this phylum. These animals are warm blooded. Their body is divided into head, neck, trunk and tail and their digits are provided with nails, claws, or hooves.
8. Jellyfish: Phylum- Cnidaria
Body of these animals is cylindrical or umbrella-like. Most of these animals are marine. Only few are fresh-water dwellers. Their body is radially symmetrical & diploblastic. Tentacles are useful for capturing the prey whereas cnidoblasts inject the toxin in the body of prey. Those are useful for protection too.
