Home
Current Affairs January 2024

What is the correct answer?

4

__________ is responsible for maintaining the current of water in sponge.

A. Osculum

B. Porocytes

C. Spongocoel

D. Choanocytes

Correct Answer :

D. Choanocytes


Choanocytes (also known as collar cells) are cells that line the spongocoel. The water current of the body of sponge is maintained by the movement of flagella of choanocytes.

Related Questions

What is the correct answer?

4

Which of the following is a fresh water sponge?

A. Sycon

B. Euspongia

C. Spongilla

D. Pleurobrachia

What is the correct answer?

4

Identify the correct characteristics of porifera.

  1. Commonly known as sea walnuts.

  2. Presence of ostia and collar cells.

  3. Exhibit tissue level of characteristics. 

  4. It is the largest phylum of animal kingdom.

  5. The body is supported by spicules and sponging fibers.

  6. Contains cnidocytes which is used for defense, anchorage and capturing of prey.

A. (ii), (v) only

B. (i), (ii), (vi) only

C. (i), (ii), (iii), (iv) only

D. All of these.

What is the correct answer?

4

A student brought home a strange animal which he found outside under a rock. It had moist skin, a complete digestive tract, a ventral nerve cord, and had gone through torsion. Identify the phylum of the animal.

A. Porifera

B. Annelida

C. Mollusca

D. Echinodermata

What is the correct answer?

4

In ctenophora, the body bears _______ external rows of ciliated comb plates, which help in locomotion.

A. five

B. six

C. seven

D. eight

What is the correct answer?

4

Which of the following feature in birds indicates their reptilian ancestory ?

A. Eggs with a calcareous shell

B. Scales on their hind limbs

C. Four-chambered heart

D. Two special chambers-crop and gizzard in their digestive tract

What is the correct answer?

4

Hemichordates have now been placed with the nonchordates, close to echinoderms, because true

A. notochord is absent.

B. pharyngeal gill-slits are lacking.

C. dorsal nerve cord is absent.

D. heart is lacking.

What is the correct answer?

4

Which of the following phylum is being described by the given statements?
(i) They are bilaterally symmetrical,triploblastic, segmented and coelomate animals.
(ii) The body consists of head, thorax, abdomen and have jointed appendages.
(iii) Circulatory system is of open type.
(iv) Excretion takes place through malphigian tubules.

A. Arthropoda

B. Annelida

C. Mollusca

D. Echinodermata

What is the correct answer?

4

A student was given a specimen to identify on the basis of the characteristics given below.
(i) They are metamerically segmented.
(ii) Presence of closed circulatory system.
(iii) They have circular and longitudinal muscles for locomotion. Identify the specimen.

A. Prawn

B. Pheretima

C. Wuchereria

D. Ctenoplana

What is the correct answer?

4

Refer the figures A, B and C and choose the correct option which shows animals that regulate buoyancy with the help of air bladder. 
akimg11

A. A and B

B. A and C

C. B and C

D. All of the above.

What is the correct answer?

4

Identify the animals shown in the given figures A, B and C from options given below. 
akimg8

A. A - Octopus; B -Asterias, C- Ophiura

B. A - Asterias; B - Ophiura, C- Octopus

C. A - Echinus; B - Octopus C - Ophiura

D. A - Ophiura; B - Echinus, C- Octopus

What is the correct answer?

4

Which of the following sets of animals give birth to young ones?

A. Platypus, Penguin, Bat, Hippopotamus.

B. Shrew, Bat, Cat, Kiwi.

C. Kangaroo, Hedgehog, Dolphin, Loris.

D. Lion, Bat, Whale, Ostrich.

What is the correct answer?

4

Read the following statements and answer the question.
(i) They are exclusively marine, radially symmetrical, diploblastic organisms with tissue level of organisation.
(ii) Body bears eight external rows of ciliated comb plates, which help in locomotion.
(iii) Digestion is both extracellular and intracellular.
(iv) Reproduction takes place only by sexual means.
Which of the following phylum is being described by above statements?

A. Platyhelminthes

B. Arthropoda

C. Mollusca

D. Ctenophora

What is the correct answer?

4

Which of the following possesses electric organs and belongs to class chondrichthyes?

A. Torpedo

B. Petromyzon

C. Trygon

D. Exocoetus

What is the correct answer?

4

Which of the following statements (i – v) are incorrect ?

  1. Circulatory system in arthropods is of closed type.

  2. Parapodia in annelids helps in swimming.

  3. Phylum mollusca is the second largest animal phylum.

  4. Aschelminthes are dioecious.

A. (i) only

B. (iii) only

C. (i) and (iii)

D. (iii) and (iv)

What is the correct answer?

4

Which of the following statements (i v) are incorrect?
(i) Parapodia are lateral appendages in arthropods used for swimming.
(ii) Radula in molluscs are structures involved in excretion.
(iii) Aschelminthes are dioecious.
(iv) Echinoderm adults show radial symmetry.
(v) Ctenophorans are diploblastic.

A. (i) and (ii)

B. (i) and (iii)

C. (i), (iv) and (v)

D. (iii) and (v)

What is the correct answer?

4

Identify the correct characteristic feature shown by the given figure? 
akimg19

A. Diploblastic in nature.

B. Having radial symmetrical body.

C. Dioecious with direct development.

D. Presence of sensory tentacles on anterior head region.

What is the correct answer?

4

Polyp phase is absent in

A. Hydra

B. Aurelia

C. Physalia

D. Obelia

What is the correct answer?

4

The figure given below shows the germinal layers marked as A, B, C and D. Identify the label showing undifferentiated layer and its location?
akimg14

A. A, Between B & C

B. B, Between A & C

C. C, Between C & D

D. D, Between A & B

What is the correct answer?

4

Which of the following statements is without exception in sponges ?

A. They all have calcareous spicules.

B. They have high regenerative power.

C. They are found only in marine water.

D. They are all radially symmetrical.

What is the correct answer?

4

Identify the figure with its correct name and phylum. 
akimg6

A. Sycon - Porifera

B. Aurelia - Coelenterata

C. Pleurobrachia - Ctenophora

D. Tapeworm - Platyhelminthes

What is the correct answer?

4

Which of the following is not a characteristic feature of kingdom animalia ?

A. Storage of carbohydrates as starch.

B. Multicellularity.

C. Obtaining nutrients by ingestion.

D. Having eukaryotic cells without walls.

What is the correct answer?

4

Meandrina (brain coral) belongs to phylum

A. porifera

B. coelenterata

C. ctenophora

D. platyhelminthes

What is the correct answer?

4

__________ is responsible for maintaining the current of water in sponge.

A. Osculum

B. Porocytes

C. Spongocoel

D. Choanocytes

What is the correct answer?

4

Identify the figures and select the correct option 
akimg5

A. A - Pseudocoelomate; B - Coelomate, C-Acoelomate

B. A - Coelomate, B - Pseudocoelomate, C- Acoelomate

C. A - Coelomate; B- Acoelomate; C - Pseudocoelomate

D. A - Coelomate; B- Acoelomate; C-Eucoelomate

What is the correct answer?

4

Which of the following phylum is being described by the given statements?
(i) These are primitive multicellular animals and have cellular level of organization.
(ii) Digestion is intracellular.
(iii) They have a water transport or canal system.
(iv) They reproduce asexually by fragmentation and sexually by formation of gametes.

A. Porifera

B. Ctenophora

C. Coelenterata

D. Platyhelminthes

What is the correct answer?

4

Refer the following animals and identify those which have a fluid filled body cavity with a complete lining derived from mesoderm.
(i) Sycon (ii) Butterfly
(iii) Nereis (iv) Sea fan
(v) Scorpion (vi) Pila

A. (i) and (iii) only

B. (ii) and (iv) only

C. (ii), (iii), (v) and (vi) only

D. All of these

What is the correct answer?

4

Which of the following pairs of animals comprises jawless fishes?

A. Mackerals and rohu

B. Lampreys and hag fishes

C. Guppies and hag fishes

D. Lampreys and eels

What is the correct answer?

4

Which of the following animal's body is covered by calcareous shell and unsegmented with a distinct head, muscular foot, and visceral hump? 
akimg17

A. Click to check answer

B. Click to check answer

C. Click to check answer

D. Click to check answer

What is the correct answer?

4

The given figures (A & B) shows the germinal layer. The animals having structures shown in the figures are respectively called 
akimg1

A. diploblastic, triploblastic

B. triploblastic, diploblastic

C. diploblastic, diploblastic

D. triploblastic, triploblastic

What is the correct answer?

4

Which of the following traits is not shared by both sea anemones and jellyfish ?

A. A medusa as the dominant stage in the life cycle.

B. Possession of a gastro vascular cavity.

C. Sexual reproduction.

D. Nematocysts present on the tentacles.