MCQ on Phylum Mollusca for NEET
NEET Biology MCQ on Phylum Mollusca with Answers by Expert Teacher. Every Questions is Important and Common for NEET-UG Exam.
1.) Which of the following body parts contains all the internal organs in Mollusca?
a) Foot
b) Head
c) Visceral mass
d) Mantle
2.) Mollusca is the ………………………………………………………… largest phylum of the animal kingdom.
a) First
b) Second
c) Third
d) Fourth
3.) How many pairs of kidneys are present in animals of Mollusca?
a) One
b) Two
c) Three
d) Both one and two
4.) Which member of a mollusc does not have a shell?
a) Chiton
b) Pila
c) Octopus
d) Pinctada
5.) Following are the classes of phylum Mollusca EXCEPT?
a) Class Gastropoda
b) Class Arachnida
c) Class Cephalopoda
d) Class Amphineura
6.) The organ which is used for excretion in molluscs is named as:
a) Malpighian tubule
b) Flame cells
c) Osteocytes
d) Kebers organ
7.) Organisms of Monoplacophora bear:
a) One plate
b) Two plates
c) Three plates
d) Four plates
8.) Molluscs are usually ………………………………………………………………… and ……………………………………………………………………. organisms.
a) Dioecious, viviparous
b) Monoecious, oviparous
c) Dioecious, oviparous
d) Dioecious, ovoviviparous
9.) Identify the incorrect pair with respect to class Amphineura from the following.
i) Mollusca- with an oval body.
ii) Shell- many plates formation
iii) Example- Chiton
a) Both i) and ii)
b) Only i)
c) Only ii)
d) Only iii)
10.) The below organisms belong to the phylum molluscs except:
a) Pila
b) Loligo
c) Octopus
d) Asterias
11.) Which of the following is an example of Scaphopoda?
a) Oysters
b) Clams
c) Dentalium
d) Mussels
12.) The space between the hump and the mantle is called……………………………………………………………………………….
a) Cavity
b) Coelom
c) Mantle cavity
d) Mantle hump
13.) Pila is also known as:
a) Apple snail
b) Tusk shell
c) Freshwater mussel
d) Squid
14.) The rasping organ in the mouth for feeding is called:
a) Radula
b) Comb plates
c) Buccal cavity
d) Parapodia
15.) In the Mollusca, respiration occurs through the gill which is located in the:
a) Tentacles
b) Head
c) Shell
d) Mantle cavity
16.) The sensory tentacles are present in which part of the body?
a) Posterior head
b) Anterior head
c) Mouth
d) Visceral hump
17.) Bivalvia is also called:
a) Lam ellibranchia
b) Thecosomata
c) Gastropoda
d) Nautilus
18.) The feather-like gills are present in the …………………………………………………………………………………….
a) Visceral hump
b) Coelom
c) Mantle cavity
d) Head
19.) Some Molluscs’ gland mimics the liver in vertebrates. The name of the gland is:
a) Yellow gland
b) Green gland
c) Pink gland
d) Reddish gland
20.) The body of mollusks is ……………………………………………………… symmetrical and …………………………………………………………………..
a) Radially, diploblastic
b) Bilaterally, Triploblastic
c) Triploblastic, Bilateral
d) Radially, Triploblastic
21.) Which of the following organisms have no shell and no foot?
a) Neomenia
b) Chaetoderma
c) Nematomain
d) All of them
22.) The body of the mollusk is covered with:
a) Chitinous shell
b) Calcareous shell
c) Fungal shell
d) Exoskeleton
23.) Which one of the following is the name of the octopus?
a) Rohu
b) Cuttlefish
c) Devilfish
d) Sea mouse
24.) The Pearl oyster among the following is:
a) Aplysia
b) Pinctada
c) Loligo
d) Sepia
25.) Which of the following statements is WRONG?
a) Organisms of Archaeogastropoda possess one or two bipectinate ctenidia.
b) In the organisms of Archaeogastropoda, sex cells discharge through tentacles in the sea.
c) Examples of Archaeogastropoda are Buccinum, Murex, Nassarius, Oliva, etc.
d) In the organisms of Sacoglossa, cerata and parapodia are present.
26.) Find the correct option.
a) All molluscs have shells
b) Most molluscs are diploblastic
c) Molluscs are triploblastic
d) All are correct
Answers:
1.)
Solution: c) Visceral mass
The head part of the body includes the mouth, tentacles, and eyes. The visceral mass of Mollusca contains all the internal organs.
2.)
Solution: b) Second
Mollusca is the second largest phylum of the animal kingdom whereas Arthropoda is the first largest phyla of the animal kingdom.
3.)
Solution: d) Both one and two
Some organisms of Mollusca have only one pair of kidneys and some have two pairs of kidneys.
4.)
Solution: c) Octopus
The Octopus is an aquatic cephalopodan Mollusca that does not have a shell.
5.)
Solution: b) Class Arachnida
Class Arachnida is a class of phylum Arthropoda. Other remaining classes are included in the phylum Mollusca.
6.)
Solution: d) Kebers organ
Kebers organs work as kidneys in mollusca to excrete waste products out of the body.
7.)
Solution: a) One plate
In the Monoplacophora, mono refers to single, placo refers to plate and phora refers to bearing.
8.)
Solution: c) Dioecious, oviparous
Dioecious as male and female sex organs are present in separate entities and oviparous because they lay eggs.
9.)
Solution: b) Only i)
Organisms of the class Amphineura are the most primitive molluscs. Their body is dorsoventrally flattened.
10.)
Solution: d) Asterias
Asterias is a starfish that belong to the phylum Echinodermata.
11.)
Solution: c) Dentalium
Dentalium is an example of Scaphopoda. Oysters, clams, and mussels are examples of Pelecypoda.
12.)
Solution: c) Mantle cavity
The space between the visceral hump and the mantle is called the mantle cavity which contains feather-like gills.
13.)
Solution: a) Apple snail
Loligo is commonly called Squid, Unio is commonly called Freshwater mussel, and Dentalium is called Tusk shell. Hence, Pila is commonly known as the Apple snail.
14.)
Solution: a) Radula
The mouth contains a rasping organ for feeding called a radula.
15.)
Solution: d) Mantle cavity
The mantle cavity includes all the internal organs. It also includes gills that perform respiration in the Mollusca.
16.)
Solution: b) Anterior head
The anterior head region contains sensory tentacles which are used for grasping and feeding.
17.)
Solution: a) Lam ellibranchia
Gastropoda is a type of mollusc and Thecosomata is an example of Gastropoda. Nautilus is an example of a Cephalopoda.
18.)
Solution: c) Mantle cavity
The feather-like gills are present in the mantle cavity and have both respiratory and excretory functions.
19.)
Solution: b) Green gland
Organisms of Mollusca possess a green gland. In vertebrates, the green gland mimics the liver.
20.)
Solution: b) Bilaterally, Triploblastic
Bilateral symmetry as the body can be divided into two identical left and right halves whereas triploblastic because it contains three germ layers.
21.)
Solution: d) All of them
All the Neomenia, Chaetoderma, and Nematomein have a worm-like body but the shell and foot are absent.
22.)
Solution: b) Calcareous shell
The body of Mollusca is covered with a calcareous shell because it is mostly made up of calcium carbonate. It supports and protects the soft body parts of mollusks.
23.)
Solution: c) Devilfish
Sepia is a cuttlefish and chiton is a sea mouse. Devilfish is the right answer because octopus is commonly called devilfish.
24.)
Solution: b) Pinctada
Pinctada is called a pearl oyster because they have a strong inner shell called the mother of pearl.
25.)
Solution: b) In the organisms of Archaeogastropoda, sex cells discharge through tentacles in the sea.
26.)
Solution: c) Molluscs are triploblastic
This is the correct option as its embryonic stage contains three germ layers ectoderm, endoderm, and mesoderm.