Class Chondrichthyes

Q. Operculum is absent in

1. Labeo
2. Exocoetus
3. Pristis
4. Betta

Q.

Placoid scales are present in?

Q.

Ventral mouth is seen in

1. Salamandra

2. Scoliodon

3. Labeo

4. Catla

Q.

What are partial regulators?

Q. Which of the following characteristic features always holds true for the corresponding group of animals?

1. Cartilaginous endoskeleton - Chondrichthyes
2. Viviparous - Mammalia
3. Possess a mouth with an upper and a lower jaw - Chordata
4. 3 - chambered heart with one incompletely divided ventricle - Reptilia

Q. Which one of the following mineral elements plays an important role in biological nitrogen fixation?

1. Copper
2. Manganese
3. Zinc
4. Molybdenum

Q.

What is cycloid scale?

Q. Marine teleost fishes excrete
(a) Uric acid. (b) Ammonia
(c) Urea. (d) None of these

Q.

List any eight characteristics of class Amphibia.

Q.

Draw the diagram of sea anemone.

Q.

Shark is oviparous or viviparous animal?

Q. [5]
(a) Following are the responses of different animals to various abiotic factors. Describe each one with the help of an example.
(i) Regulate
(ii) Conform
(iii) Migrate
(iv) Suspend

(b) If 8 individuals in a population of 80 butterflies die in a week, calculate the death rate of population of butterflies during that period.

Q.

Which types of scales are found on the skin of Scoliodon?

Q. The fishes that belong to class Chondrichthyes have

1. air bladder
2. operculum
3. bony endoskeleton
4. teeth

Q.

Identify the following chondrichthyes fishes.

1. 1.- Trygon , 2.- Scoliodon, 3- Pristis, 4- Carcharodon.

2. 1.- Pristis, 2.- Carcharodon, 3- Trygon , 4- Scoliodon.

3. 1.- Scoliodon, 2.- Pristis, 3- Carcharodon, 4- Trygon .

4. 1.- Carcharodon, 2.- Trygon , 3- Scoliodon, 4- Pristis.

Q.

What is difference between placoid and cycloid scales?

Q.

Teeth of cartilagenous fishes are modified

1. Ganoid scales

2. Cycloid scales

3. Placoid scales

4. Cosmoid scales

Q. List out the differences between class-Chondrichthyes and class Osteichthyes.

Q. Which type of scales are found on the skin of cartilaginous fishes?

1. Placoid
2. Ganoid
3. Ctenoid
4. Cycloid

Q.

Cartilaginous fishes do not have

1. Operculum

2. Scales

3. Gill slits

4. Pelvic fins

Q.

What are placoid scales used for?

Q.

Give one example each for an animal possessing placoid scales and that with cycloid scales.

Q. The position of the mouth in sharks is

1. lateral
2. ventral
3. dorsal
4. terminal

Q.

In birds nitrogenous waste is-

1. Urea

2. Ammonia

3. Uric acid

4. Amino acids

Q.

Give an example of an animal that does not belong to Class Pisces.

Q. Operculum is absent in

1. Labeo
2. Pristis
3. Exocoetus
4. Betta

Q. Sawfish is

1. not a true fish
2. an arthropod
3. a bony fish
4. a cartilaginous fish

Q.

Are camels uricotelic?

Q.

Does homeothermic mean warm-blooded?

Q.

What separates sharks from other fish?