Advertisements
Advertisements
प्रश्न
Write down four characters of Chondrichtyes. Give two examples.
उत्तर
Characteristics of chondrichthyes:
(i) They are marine fish with completely cartilaginous endoskeleton and a two-chambered heart.
(ii) They have a streamlined body which is either compressed laterally or flattened dorsoventrally. They have paired or median fins for locomotion and the tail or caudal fin is heteroceral.
(iii) Mouth is ventral in position and respiration occurs via gills.
(iv) Skin is tough and covered with minute placoid scales.
Examples: Scoliodon and Torpedo.
APPEARS IN
संबंधित प्रश्न
How do poriferan animals differ from coelenterate animals?
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 |
Tick (✓) the appropriate answer:
Scientist who introduced binomial nomenclature is
Write one difference between the following pair:
Invertebrates and Vertebrates
Match the animals given under column A with their respective classification group given under column B
| Column A | Column B | ||
| 1 | Sponge | a | Amphibia |
| 2 | Snail | b | Reptilia |
| 3 | Butterfly | c | Echinodermata |
| 4 | Toad | d | Mollusca |
| 5 | Lizard | e | Arthropoda |
| 6 | Starfish | f | Porifera |
Write down four characteristics of Ctenophora and give two examples.
What are differences between the following :
(a) Cartilaginous fishes and bony fishes ;
(b) Amphibia and Reptilia ;
(c) Aves and mammals.
Write down four main characters of chordates.
Describe some flight adaptations of the birds.
Why are scientific names of living beings considered better than their common names?
What are the group names of the following categories of animals?
Animals with feathers _________
Write two main characters of the following animal and name the phylum it belongs to: Jelly fish
Write name of any poikilothermic animal.
Give two examples of each of the following: Echinodermata
Give two examples of each of the following: Arthropoda
Fill in the blanks:
Ascaris is the example of phylum ______.
Choose the correct answer: Which of the following is not a helminth parasite?
Choose the correct answer: Protista is the link between
______ in 1623, introduced the binomial nomenclature.
Write short notes on – Binomial Nomenclature.
