Advertisements
Advertisements
प्रश्न
What are pisces? Classify and explain two different kinds of fishes by the help of suitable examples.
Advertisements
उत्तर
Pisces is a super class of subphylum Gnathostomata, which consists of following two classes:
Class 1: Chondrichthyes
(a) Marine fishes with entirely cartilaginous endoskeleton.
(b) They have a streamlined body that is either compressed laterally or flattened dorsoventrally.
(c) Mouth is ventral in position.
(d) Skin is tough and covered with minute placoid scales.
(e) Respiration occurs via gills.
Examples: Scoliodon and Torpedo
Class 2: Osteichthyes:
(a) Marine and fresh-water fish with partial or full bony endoskeleton.
(b) Their size varies from 10 mm to 4 metres.
(c) They have a spindle-shaped body.
(d) Four pairs of gills are present for respiration.
(e) They excrete ammonia (ammonotelic animals).
Examples: Labeo and Protopterus.
APPEARS IN
संबंधित प्रश्न
What are the differences between amphibians and reptiles?
Match the following:
| Column I | Column II | ||
| (a) | Operculum | (i) | Ctenophora |
| (b) | Parapodia | (ii) | Mollusca |
| (c) | Scales | (iii) | Porifera |
| (d) | Comb plates | (iv) | Reptilia |
| (e) | Radula | (v) | Annelida |
| (f) | Hairs | (vi) | Cyclostomata and Chondrichthyes |
| (g) | Choanocytes | (vii) | Mammalia |
| (h) | Gill slits | (viii) | Osteichthyes |
Write one difference between the following pair:
Invertebrates and Vertebrates
Define the term hermaphrodite. Give two examples.
What do you mean by the term coelomate animals? Give two examples.
Write down four characters of mammals. Give two examples.
Give one point of difference between notochord and nerve cord.
The animals (Kingdom Animalia) are mainly grouped under two categories
What are the group names of the following categories of animals?
Animals with a backbone _____________
What are the group names of the following categories of animals?
Animals with a hairy skin ___________
Write two main characters of the following animal and name the phylum it belongs to: Whale
Write two main characters of the following animal and name the phylum it belongs to: Jelly fish
Give two examples of each of the following: Platyhelminthes
Give two examples of each of the following: Nemathelminthes
Give two examples of each of the following: Arthropoda
Choose the correct answer: The animal of phylum mollusca is
Choose the correct answer: Which of the following is not a helminth parasite?
Choose the correct answer: 'Systema naturae' has been written by
______ in 1623, introduced the binomial nomenclature.
