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Standard XII
Biology
Question

Choose the correct statement.
  1. All Pisces have gills covered by an operculum.
  2. All reptiles have a three-chambered heart.
  3. All mammals are viviparous.
  4. All cyclostomes do not possess jaws and paired fins.

A
All Pisces have gills covered by an operculum.
B
All mammals are viviparous.
C
All reptiles have a three-chambered heart.
D
All cyclostomes do not possess jaws and paired fins.
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Solution
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All reptiles have three-chambered heart except crocodiles, they have four-chambered heart. Class Chondrichthyes are cartilaginous fishes that lack operculum. Monotremes are egg-laying mammals. Agnatha/ Cyclostomata is the historical class of jawless fishes that lack paired fins without any exception.
Therefore, the correct answer is option D.

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Similar Questions
Q1
Statement 1: All reptiles have a three chambered heart

Statement2: Reptiles lay eggs.
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Q2
Match the following columns and select the correct option.

Column-I

Column-II

(a)

Scales and paired fins absent

(i)

Torpedo

(b)

Claspers on pelvic fins of males

(ii)

Cyclostomes

(c)

4 pairs of gills covered with operculum

(iii)

Chondrichthyes

(d)

Electric organs

(iv)

Osteichthyes

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Q3
Question 11
Find out the false statement

(a) Aves are warm blooded, egg laying and have four chambered heart
(b) Aves have feather covered body, fore limbs are modified as wing and breathe through lungs.
(c) Most of the mammals are viviparous.
(d) Fishes, amphibians and reptiles are oviparous
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Q4
The heart of mammals and birds is four-chambered, while fishes have two-chambered hearts and amphibians and reptiles have three-chambered hearts. The hearts of birds and mammals are:

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Q5
Assertion: Crocodiles have a four chambered heart.
Reason: Most reptiles have a three chambered heart.

Choose the correct answer.
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