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Gill slits are covered by operculum in …...

Gill slits are covered by operculum in ………… .

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**Step-by-Step Text Solution:** 1. **Understanding Gill Slits and Operculum**: Gill slits are openings that allow water to flow over the gills, where gas exchange occurs. The operculum is a bony flap that covers and protects these gill slits in certain fish. 2. **Identifying the Types of Fish**: There are two main categories of fish: bony fish (Osteichthyes) and cartilaginous fish (Chondrichthyes). 3. **Bony Fish (Osteichthyes)**: In bony fish, such as Rohu and Katla, the gill slits are covered by an operculum. This structure serves to protect the gills and aids in respiration by helping to pump water over the gills. ...
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Which of the following is/are not the characteristics of the Class Osteichthyes? (i) Body is streamlined and mouth is terminal. (ii) Gills are convered by operculum. (iii) Skin convered with cycloid and placoid scales. (iv) Many of them are viviparous.

The gills of sharks are covered by an operculum.

Consider the following characteristic of fishes :- (1) They have four pairs of gills which are covered by an operculum. (2) They have air bladder which regulates buoyancy (3) They are mostly viviparous and development is direct (4) Their body is streamlined and covered with cycloid/ctenoid scales Which of the above characteristics regarding bony fishes are correct?

Choose the correct statements : I. Cartilaginous fish swims continously due to the presence of an air bladder. II. Osteichthyes have four pairs of gills that are covered by an operculum. III. The notochord is persistent throughout life in Chondrichthyes. IV. Teeth of cartilaginous fishes are modified placoid scales.

Select the option with a correct representation of an animal to the below-mentioned class of vertebrates: I. The jawless animal in which the body is devoid of scales and paired fins. II. They have four pairs of gills that are covered by an operculum. III. The body is covered by dry and cornified skin, epidermal scales or scutes. IV. Skin is dry without glands and long bones are hollow with air cavities.

Which of the following statement are not true about shark? a. The skin is tough and covered with placoid scales. b. They possess a swim bladder which regulates buoyancy. c. the tail of shark is heterocercal. d. Ampulla of lorenzini present in the snout of shark is thermoreceptor. e. it has five pairs of gill slits covered by operculum.

MODERN PUBLICATION-ANIMAL KINGDOM-QUICK MEMORY TEST (COMPLETE THE MISSING LINKS)
  1. Autotomy and regeneration are peculiar characters of ……….. .

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  2. ……………. maintain a water currect in the sponges.

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  3. Syncytial epidermis is found in

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  4. Rearing of silkworm is called:

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  5. Tube feet of echinoderms help in ……….. and ………. .

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  6. Gill slits are covered by operculum in ………… .

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  7. ………… and ………… are egg-laying mammals.

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  8. Balanoglossus belongs to …………. .

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  9. Squirrels have chisel-like incisors for ………… .

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  10. The distinctive feature of Primata is ………… .

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  11. The structure which separates the thoracic cavity from abdominal cavit...

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  12. True coelom originated firstly in ………… .

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  13. A coral reef with central shallow lake is called ………….. .

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  14. Food storing cells of sponges are called ………. .

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  15. Biradial symmetry is found in ………. .

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  16. Botryoidal tissue is filled coelom is found in ……….. .

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  17. In …………. of Mollusca, eye structure resembles to that of vertabrates.

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  18. ………. acts as a connecting link between Annelida and Arthropoda.

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  19. Largest land animal is …………… while tallest animal is ………… .

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  20. Duck billed platypus belongs to ………….. While kangaroo belongs to …………....

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