Test: Basis of Classification

QUESTION: 1

Read the given statements and select the correct option.
Statement 1: All triploblastic animals are eucoelomates.
Statement 2: They have a false coelom.

A.
Both statements 1 and 2 are correct and statement 2 is the correct explanation of statement 1.
B.
Both statements 1 and 2 are correct but statement 2 is not the correct explanation of statement 1.
C.
Statement 1 is correct and statement 2 is incorrect.
D.
Both statements 1 and 2 are incorrect.

Solution:

Animals belonging to phyla Platyhelminthes to Chordal are triploblasti whole poriferans and cnidarians are diploblastic Sponges, cnidarians, ctenophorans and platyhelminth are acoelomates, aschelminthes are pseudocoelomats and annelids, arthropods, echinoderms and chordates are eucoelomates. Eucoelomates have true coelom.

QUESTION: 2

Which of the following statements is incorrect with regard to bilateral symmetry?

A.
Body can be divided into two equal halves by a single plane only.
B.
The organisms that show bilateral symmetry have paired body organs that occur on the two sides of a central axis.
C.
It is found in all invertebrates and few vertebrates.
D.
Spider and crab show bilateral symmetry.

Solution:

Bilateral symmetry is found in few invertebrates and all vertebrates.

QUESTION: 3

Examine the figures of diploblastic (i) and triploblastic (ii) organization in animals given below and identify the labelled parts A to D.

A.
A - Mesoglea, B - Ectoderm, C - Endoderm, D - Mesoderm
B.
A - Endocdern, B - Mesoderm, C - Mesoglea, D - Ectodderm
C.
A - Mesoderm, B - Mesoglea, C - Ectoderm, D - Endoderm
D.
A - Ectoderm, B - Endoderm, C - Mesoglea, D - Mesoderm

Solution:

A - Ectoderm
B - Endoderm
C - Mesoglea
D - Mesoderm
So, the correct answer is 'A - Ectoderm, B - Endoderm, C - Mesoglea, D - Mesoderm'.

QUESTION: 4

Diploblastic and triplo blastic are terms that describe

A.
the number of in vaginations during embryonic development
B.
the number of heads during embryonic development
C.
the number of germinal layers during embryonic development
D.
the number of cell types during development

Solution:

(i) Diploblastic animals have two germinal layers (ectoderm and endoderm) during embryonic development
Example: Poriferans.
(ii) Triploblastic animals have three germinal layers (ectoderm, mesoderm and endoderm) during embryonic development
Example: Platyhelminthes.

QUESTION: 5

Select the correct matching of animals, their symmetry, organisation and coelom type.

A.
a
B.
b
C.
c
D.
d

Solution:

Platyhelminthes are triploblastic, acoelomate organism showing bilateral symmetry. Ctenophores have borads symmetry, are acoelomates having diploblastic organisation. In echinoderms, larvae have bilateral symmetry whiled add have radial symmetry. They are coelomates with triplobla organisation. Annelids are triploblastic, coelomaterorganism showing bilateral symmetry.

QUESTION: 6

The figures given below show the types of coelom. Identify them and select the correct group of organisms which possess them.

A.
a
B.
b
C.
c
D.
d

Solution:

Figure 'A' is of coelomates (Annelids), Figure 'B' is a pseudo-coelomates (Aschelminthes) and Figure 'C' is a acoelomates (Plathyhelminthes).

QUESTION: 7

Study carefully the given flow chart and fill in the blanks (A), (B), (C), (D) and (E).

A.
a
B.
b
C.
c
D.
d

Solution:

(A) Cellular level
(B) Radial symmetry
(C) Bilateral symmetry
(D) Pseudocoelomates
(E) Coelomates

QUESTION: 8

Which of the following is correctly matched?

A.
Radial symmetry - Coelenterates
B.
Coelomates - Aschelminthes
C.
Metamerism - Molluscs
D.
Triploblastic - Sponges

Solution:

Coelenterates have radial symmetry. Aschelminth are pseudocoelomates. Molluscs do not show metamerit Sponges are diploblastic.

QUESTION: 9

The given figure shows a cross section of the body of an invertebrate. Identify the animal which has such body plan.

A.
Cochrooch (Artfiropoda)
B.
Round worm (Aschelminthes)
C.
PIanarla (Platyhelrninthes)
D.
Earthworm (Annelida)

Solution:

The animals in which the coelom is absent are called acoelomates, for example flatworms (Planaria). In them the space between ectoderm and endodorm is filled with parenchyma derived from mesoderm.

QUESTION: 10

Which of the following are correct?
(i) Diploblastic : Poriferans, Coelenterates
(ii) Triploblastic : Platyhelrninthes to Chordates
(iii) Acoelomata : Poriferans, Coelenterates, Platyhelminthes
(iv) Pseudocoelomata : Aschelminthes/Roundworms
(v) Eucoelomata : Annelids to Chordates

A.
None of these
B.
All of these
C.
(i), (ii) and (v) are correct
D.
(iii) and (v) are correct

Solution:

(i) Diploblastic - Poriferans, Coelenterates
(ii) Triploblastic - Platyhelminthes to Chordates
(iii) Acoelomate - Poriferans, Coelenterates, Platyhelminthes
(iv) Pseudocoelomate - Aschelminthes/Roundworms
(v) Eucoelomate - Annelids to Chordates
So, the correct answer is '(i), (ii), (iii), (iv) and (v)'.

10 Questions MCQ Test NCERTs for NEET | Test: Basis of Classification

Read the given statements and select the correct option.
Statement 1: All triploblastic animals are eucoelomates.
Statement 2: They have a false coelom.

Which of the following statements is incorrect with regard to bilateral symmetry?

Examine the figures of diploblastic (i) and triploblastic (ii) organization in animals given below and identify the labelled parts A to D.

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