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12th Grade > Biology

ANIMAL KINGDOM MCQs

Total Questions : 53 | Page 1 of 6 pages
Question 1. Ctenophores differ from cnidarians in having
  1.    Organs
  2.    Ciliated comb plates
  3.    Cnidocytes
  4.    Diploblastic nature
 Discuss Question
Answer: Option B. -> Ciliated comb plates
:
B
Both cnidarians and ctenophores exhibit tissue level of organisation, and are also diploblastic. Cnidocytes or stinging cells are found only in cnidarians, while ctenophores possess unique ciliated comb plates which help in locomotion.
Question 2. Water vascular system is the characteristic feature of which of the following phyla?
  1.    Porifera
  2.    Echinodermata
  3.    Cnidaria
  4.    Mollusca
 Discuss Question
Answer: Option B. -> Echinodermata
:
B
Water vascular system, also called ambulacral system is a characteristic feature of Phylum Echinodermata. Itserves for locomotion, respiration and food capture.It basicallyconsists of a system of canals and reservoirs containing a watery fluid, the system consisting of a sieve plate, or madreporite, and a ring vessel, or water-vascular ring, that are connected by a frequently calcified vessel called the stone canal. Five radial water canals extend outward from the ring vessel and give rise to branches that end in the tube feet, which are in contact with the sea. It is specifically the tube feet thatare used to pass food to the oral mouth at the center, and can attach to surfaces.
Question 3. Vertebral column is derived from
  1.    Notochord
  2.    Dorsal nerve cord
  3.    Ventral nerve cord
  4.    Outgrowth of neural tube
 Discuss Question
Answer: Option A. -> Notochord
:
A
Vertebrata is a sub-phylum under Phylum Chordata in which, animals possess a notochord during embryonic development, which gets replaced by the vertebral column in the adult.
Question 4. The animals which are exclusively aquatic, sessile, with cellular level of organisation of the body are placed in phylum _____
  1.    Protozoa
  2.    Porifera 
  3.    Ctenophora
  4.    Cnidaria 
 Discuss Question
Answer: Option B. -> Porifera 
:
B
Phylum Porifera includes the sponges, which are exclusively aquatic, sessile, and exhibit cellular level of organisation of body matter. It is also the only phylum that comes under sub-kingdom Parazoa in the Animal Kingdom.
Question 5. Parapodia are seen in
  1.    Nereis
  2.    Pheretima
  3.    Hirudinaria
  4.    All of these
 Discuss Question
Answer: Option A. -> Nereis
:
A
Aquatic annelids like Nereispossess lateral appendages called parapodia, which help in swimming. Pheretima(earthworm) uses setae for locomotion. Hirudinaria(leech) uses its suckers for attachment to the host, but has no parapodia or setae.
Question 6. Identify the wrong match:
  1.    Porifera – spicules
  2.    Ctenophora – bioluminescence
  3.    Mollusca – chitinous shell
  4.    Annelida – nephridia
 Discuss Question
Answer: Option C. -> Mollusca – chitinous shell
:
C
The body of sponges is supported by spicules or spongin fibres. Ctenophores (comb jellies) exhibit bioluminescence, which is a property by which the organisms can emit light. Annelids possess structures called nephridia which help in excretion. Members belonging to Phylum Mollusca do possess a hard exoskeleton, but it is made up of calcium carbonate and not chitin. Chitinous exoskeleton is characteristic of arthropods.
Question 7. Which of the following pairs of phyla exhibit segmentation?
  1.    Platyhelminthes and Arthropoda
  2.    Echinodermata and Annelida
  3.    Annelida and Arthropoda
  4.    Mollusca and Chordata
 Discuss Question
Answer: Option C. -> Annelida and Arthropoda
:
C
Metamerism or segmentation is the phenomenon of having a linear series of body segmentsfundamentally similar in structure. The individual segments are known as metameres. However, not all these segments are entirely alike in any single life form because some of them perform special functions. Metameric segmentation can be distinctly seen in Annelida (e.g., earthworm) and Arthropoda (e.g., cockroach, prawn etc.). Most chordates too, exhibit segmentation at some point duringtheir life history.
Question 8. Which of the following is correct?
  1.    Ornithorhynchus lays eggs
  2.    Rat has cloaca
  3.    Amphibian skin is covered with a few scales
  4.    Bat has feathers
 Discuss Question
Answer: Option A. -> Ornithorhynchus lays eggs
:
A
Ornithorhynchus (platypus)is an egg-laying mammal. Cloaca is a common chamber into which the alimentary, reproductive and urinary tracts open, in amphibians and some reptiles. Rat is however, a mammal, and does not possess a cloaca. Amphibian skin is smooth and moist and is devoid of scales. Feathers are typical of birds. Bat is a mammal, and is devoid of feathers on its body.
Question 9. Assertion: Bats and whales are classified as mammals.
Reason: Bats and whales have four chambered heart.
  1.    Both Assertion and Reason are true and Reason is the correct explanation of Assertion
  2.    Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
  3.    Assertion is true but Reason is false
  4.    Both Assertion and Reason are false
 Discuss Question
Answer: Option B. -> Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
:
B
Bats and whales are members of Class Mammalia. Bats are mammals which have wings and can fly, while whales are the largest animals in existence.Both bats and whales have four chambered hearts, but this is not the reason for them to be classified as mammals. They are mammals because of the presence of mammary glands. Moreover, birds and crocodiles also have four chambered hearts, which indicates that the four chambered heart is not unique to mammals alone.
Question 10. Which invertebrate phylum possesses the following features?
Bilateral symmetry, triploblastic, metamerism, open vascular system
  1.    Annelida
  2.    Mollusca
  3.    Arthropoda
  4.    Both Annelida and Arthropoda
 Discuss Question
Answer: Option C. -> Arthropoda
:
C
Bilateral symmetry, triploblastic nature and metamerism are seen in both Annelida and Arthropoda. However, arthropods possess an open vascular system, while annelids possess a closed type.

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