Porifera MCQ (Multiple Choice Questions and Answers)
Question 1 : The study of sponges is called
A) Protozoology
B) Parazoology
C) Nematology
D) Helminthology
Answer : B
Question 2 : The intercommunicating cavities in the body of a sponge constitute
A) Water vascular system
B) Canal system
C) Circulating system
D) None of the above
Answer : B
Question 3 : Choanocytes are present in
A) Incurrent canals
B) Radial canals
C) Excurrent canals
D) Spongocoel
Answer : C
Question 4 : The epidermis of sponge is made up of
A) Thesocytes
B) Pinacocytes
C) Choanocytes
D) Archaeocytes
Answer : B
Question 5 : The nutrition in sponges is
A) Holozoic
B) Holophytic
C) Saprozoic
D) Mixotrophic
Answer : A
Question 6 : Which is the inhalent aperture in a sponge?
A) Prosopyle
B) Apopyle
C) Osculum
D) Ostium
Answer : D
Question 7 : Boring Sponge is
A) Hyalonema
B) Cliona
C) Chalina
D) Spongilla
Answer : B
Question 8 : Paragastric cavity of sponges is lined by
A) Amoebocytes
B) Chromocytes
C) Choanocytes
D) Pincocytes
Answer : C
Question 9 : Flagellate larva of sponges is
A) Amphiblastula
B) Planaria
C) Planula
D) Hydrula
Answer : A
Question 10 : Spicules are formed by
A) Calcoblasts
B) Scleroblasts
C) Spongioblasts
D) Silicoblasts
Answer : B
Question 11 : Which is a collared cell
A) Scleroblasts
B) Silicoblasts
C) Spongioblasts
D) Silicoblasts
Answer : D
Question 12 : Spicule producing cells of sponges are
A) Spongioblasts
B) Calcoblasts
C) Silicoblasts
D) Both B and C
Answer : D
Question 13 : Ingestion in sponge is by
A) Pinacocytes
B) Archaeocytes
C) Trophocytes
D) Choanocytes
Answer : D
Question 14 : Sponges show
A) Protoplasmic level of organisation
B) Cellular level of organisation
C) Tissue level of organisation
D) None of the above
Answer : B
Question 15 : Who considered sponges as animal first
A) Aristotle
B) Darwin
C) Leeuwenhoek
D) Ellis
Answer : D
Question 16 : The precious sponge is
A) Hyalonema
B) Euplectella
C) Euspongia
D) Grantia
Answer : B
Question 17 : Euplectella belongs to class
A) Homocoela-Calcarea
B) Hexactinellida
C) Demospongiae
D) Heterocoela-Calcarea
Answer : B
Question 18 : Choanocytes are
A) Ectodermal
B) Mesodermal
C) Endodermal
D) Intersitial cells
Answer : C
Question 19 : Pinacocytes are
A) Ectodermal
B) Mesodermal
C) Endodermal
D) Interstitial cells
Answer : A
Question 20 : Internal buds in sponge are called
A) Nodes
B) Buds
C) Gemmules
D) Gastrulae
Answer : C
Question 21 : Common larva of a sponge is
A) Tadpole
B) Planula
C) Placula
D) Parenchymula
Answer : D
Question 22 : Sponges are
A) Pelagic
B) Sessile
C) Nekton
D) Plankton
Answer : B
Question 23 : A common chamber in sponges is
A) Incurrent canal
B) Radial canal
C) Excurrent canals
D) Spongoceol
Answer : D
Question 24 : Gemmules take part in
A) Sexual reproduction
B) Asexual reproduction
C) Digestion
D) Development of water current in sponges
Answer : B
Question 25 : Euplectella is a symbol of union till death because
A) Its basal root tuft and upper part symbolise the two sexes
B) A young shrimp pair gets entrapped in the sponge
C) It symbolises the goddess of marriage
D) It contains a sieve plate in the osculum region
Answer : B
Question 26 : Root tuft passes as columella and then forms gastral cone in
A) Hyalonema
B) Spongia
C) Spongilla
D) Cliona
Answer : A
Question 27 : A dried piece of sponge is composed of
A) Cellulose fibres
B) Silk fibres
C) Spongin fibres
D) Elastic fibres
Answer : C
Question 28 : In sponges, which one of the following corresponds to the mouth of other animals
A) Oseulum
B) Incurrent canal
C) Ostia
D) Excurrent canal
Answer : C
Question 29 : Many sponges may be bigger than fishes, yet they do not have respiratory organs because they
A) Are sedentary
B) Have porous body
C) Respire anaerobically
D) Do not require them
Answer : B
Question 30 : Which is correct in sponges
A) Single mouth innumerable exits
B) Single exit innumerable mouths
C) A true coelom
D) Radial symmetry
Answer : B
Question 31 : Difference between sponges and other metozoa is
A) Sponges do not contain blood
B) Sponges possess cellular level of organisation
C) Sponges do not have cell division
D) Sponges do not have division of labour
Answer : B
Question 32 : Sponges are characterised by
A) Absence of organs and diseases
B) Presence of tissues but absence of organs
C) Presence of both tissues and organs but absence of organ system
D) Absence of cells
Answer : A
Question 33 : Sponges lack
A) Body plan
B) Cellular differentiation
C) Appendages
D) Sexual reproduction
Answer : C
Question 34 : Pinacoderm is
A) Name of body wall of sponges
B) Outer body layer of sponges
C) Inner body layer
D) Middle layer of body wall
Answer : B
Question 35 : Mesohyl layer of sponges is
A) Nonliving
B) Noncellular
C) Gelatinous
D) All the above
Answer : D
Question 36 : Wandering cells of sponges are called
A) Pinacocytes
B) Porocytes
C) Choanocytes
D) Amoebocytes
Answer : D
Question 37 : Choanocytes are
A) Uniflagellate
B) Biflagellate
C) Tetraflagellate
D) Multiflagellate
Answer : A
Question 38 : Digestion of food is completed in sponges in
A) Choanocytes
B) Trophocytes
C) Thesocytes
D) Phagocytes
Answer : B
Question 39 : In sponges, various types of body cells obtain nourishment from
A) Choanocytes
B) Trophocytes
C) Thesocytes
D) Both B and C
Answer : D
Question 40 : Mesogloea of sponges consists of
A) Gelatinous matrix
B) Fibres
C) Spicules
D) All the above
Answer : D
Question 41 : Collencytes of sponges are connected with production of
A) Collagen fibres
B) Spicules
C) Spongin fibres
D) Both B and C
Answer : A
Question 42 : Myocytes of sponges are modified
A) Choanocytes
B) Amoebocytes
C) Pinacocytes
D) Gland cells
Answer : C
Question 43 : Cells peculiar to porifers are
A) Choanocytes
B) Porocytes
C) Both A and B
D) Amoebocytes
Answer : C
Question 44 : Myocytes of sponges show
A) Contractibility
B) Nervous excitation
C) Secretion of fibres
D) All the above
Answer : A
Question 45 : Sponges are
A) Planktonic
B) Nectonic
C) Neuston
D) Sedentary
Answer : D
Question 46 : Silicoblasts occur in
A) Calcarea
B) Hexactinellida
C) Demospongia
D) Both B and C
Answer : D
Question 47 : In sponges the germ cells are
A) Flagellate
B) Nonflagellate
C) Uniflagellate sperm and nonflagellate egg
D) Multiflagellate sperm and nonflagellate egg
Answer : C
Question 48 : Germ cells of sponges are formed by
A) Pinacocytes
B) Archaeocytes
C) Collencytes
D) Choanocytes
Answer : B
Question 49 : Demospongiae have
A) Monoaxon spicules
B) Triaxon spicules
C) Tetraxon spicules and spongin fibres
D) All the above
Answer : A
Question 50 : Sponges are
A) Ammonotelic
B) Ureotelic
C) Uricotelic
D) Both B and C
Answer : A