NEET Biology Animal Kingdom MCQs Set 06

Answer: (b) Feeding

Explanation:
1. The correct option is (2) Feeding.
2. Mouth of molluscs contain file like rasping organ, with transverse rows of chitinous teeth, this is called radula. Radula is feeding or rasping organ in molluscs. Phylum : Echinodermata.

Teacher's Note:
1. Link this question to the matching NCERT topic and revise it.
2. The point to remember: Feeding.

Answer: (c) Sea hare

Explanation:
1. The correct option is (3) Sea hare.
2. Sea lily belong to crinoidea class of phylum echinodermata. Sea cucumber belong to holothuroidea class of phylum echinodermata. Sea urchin belong to echinoidea class of phylum echinodermata. Sea hare is Aplysia, belong to class gastropoda of phylum mollusc.

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1. Link this question to the matching NCERT topic and revise it.
2. The point to remember: Sea hare.

Answer: (d) Endoskeleton

Explanation:
1. The correct option is (4) Endoskeleton.
2. Echinoderms possess an endoskeleton (internal skeleton) of calcareous ossicles (small bones), embedded in skin. The endoskeleton is derived from mesoderm in echinodermates.

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1. Link this question to the matching NCERT topic and revise it.
2. The point to remember: Endoskeleton.

Answer: (b) (b) & (c)

Explanation:
1. The correct option is (2) (b) & (c).
2. Asterias is star fish, belong to phylum echinodermata. Echinoderms are free-living animals. Adult echinoderms are radially symmetric but larval forms are bilaterally symmetric in echinoderms.

Teacher's Note:
1. Link this question to the matching NCERT topic and revise it.
2. Check every option separately before choosing a combined answer.

Answer: (d) All of these

Explanation:
1. The correct option is (4) All of these.
2. Water vascular system is most distinctive feature of echinoderms. Water vascular system in echinoderms perform function of locomotion, capture and transport of food, respiration as well as excretion.

Teacher's Note:
1. Link this question to the matching NCERT topic and revise it.
2. Check every option separately before choosing a combined answer.

Answer: (b) Excretory system

Explanation:
1. The correct option is (2) Excretory system.
2. Water vascular system is characteristic feature of echinoderms. In echinoderms, specialised excretory system is absent. The excretory products diffuse out from the body tissue into coelomic fluid from where waste is eliminated out. Phylum : Hemichordata.

Teacher's Note:
1. Link this question to the matching NCERT topic and revise it.
2. The point to remember: Excretory system.

Answer: (d) Hemichordata

Explanation:
1. The correct option is (4) Hemichordata.
2. Hemichordates have soft, fragile worm like appearance. The body is cylindrical in shape and is divisible in three parts: Proboscis, collar and trunk.

Teacher's Note:
1. Link this question to the matching NCERT topic and revise it.
2. The point to remember: Hemichordata.

Answer: (c) Proboscis, collar and trunk

Explanation:
1. The correct option is (3) Proboscis, collar and trunk.
2. Body of hemichordate is divisible into proboscis, collar and trunk.

Teacher's Note:
1. Link this question to the matching NCERT topic and revise it.
2. The point to remember: Proboscis, collar and trunk.

Answer: (b) Hemichordata

Explanation:
1. The correct option is (2) Hemichordata.
2. Name hemichordates literally means half chordates and act as link between chordate and non chordate. Hemichordata was earlier considered as sub phylum under phylum chordata, but now it is placed as separate phylum under non-chordata.

Teacher's Note:
1. Link this question to the matching NCERT topic and revise it.
2. The point to remember: Hemichordata.

Answer: (b) Excretory organ

Explanation:
1. The correct option is (2) Excretory organ.
2. Excretion of nitrogenous waste in hemichordates takes place through proboscis gland. The gland collects waste from blood and pass it into coelom of proboscis from where it is excreted through proboscis pore, at anterior region of proboscis.

Teacher's Note:
1. Link this question to the matching NCERT topic and revise it.
2. The point to remember: Excretory organ.

Answer: (a) Balanoglossus, Saccoglossus

Explanation:
1. The correct option is (1) Balanoglossus, Saccoglossus.
2. Balanoglossus (Tongue worm), Saccoglossus (Tongue worm) belong to phylum hemichordata. Objective Type Questions (Metazoa, Basis of Classification).

Teacher's Note:
1. Link this question to the matching NCERT topic and revise it.
2. The point to remember: Balanoglossus, Saccoglossus.

Answer: (d) Dorsal hollow nerve cord

Explanation:
1. The correct option is (4) Dorsal hollow nerve cord.
2. Primary characteristic of chordates is presence of dorsal hollow nerve cord. Nerve cord is a part of nervous system and is found in both chordates and non-chordates. Nerve cord is ventral in position in non-chordates and dorsal in chordates.

Teacher's Note:
1. Link this question to the matching NCERT topic and revise it.
2. The point to remember: Dorsal hollow nerve cord.

Answer: (b) A diaphragm separating thorax from abdomen

Explanation:
1. The correct option is (2) A diaphragm separating thorax from abdomen.
2. Diaphragm is not a characteristic feature of all chordates. Body of mammals is internally divided into two portion thorax and abdomen by transverse circular partition called diaphragm. Incomplete diaphragm between thorax and abdomen is present in crocodiles. However diaphragm is not observed in other members of phylum chordate.

Teacher's Note:
1. Link this question to the matching NCERT topic and revise it.
2. The point to remember: A diaphragm separating thorax from abdomen.

Answer: (a) Notochord

Explanation:
1. The correct option is (1) Notochord.
2. Notochord is replaced by cartilaginous or bony vertebral column in adults of sub-phylum vertebrates. Vertebral column encloses spinal cord.

Teacher's Note:
1. Link this question to the matching NCERT topic and revise it.
2. The point to remember: Notochord.

Answer: (d) Notochord

Explanation:
1. The correct option is (4) Notochord.
2. Notochord is found only in chordates, and absent in non-chordates all chordates possess mesodermally derived notochord during their embryonic life as main axial support of body. In some chordates, notochord is replaced by vertebral column and these chordates are called vertebrates.

Teacher's Note:
1. Link this question to the matching NCERT topic and revise it.
2. The point to remember: Notochord.

Answer: (d) Post anal part (tail) is present

Explanation:
1. The correct option is (4) Post anal part (tail) is present.
2. Characteristic of chordates are:-  Ventral Heart  Gut is ventral to nerve cord  Part of central nervous system (nerve cord) is dorsal, hollow and single  Presence of post anal tail for balancing (Classification of Protochordata or Acraniates, Sub-phylum : Urochordata, Cephalochordata).

Teacher's Note:
1. Link this question to the matching NCERT topic and revise it.
2. The point to remember: Post anal part (tail) is present.

Answer: (b) Statement-1 is correct, statement-2 is wrong

Explanation:
1. The correct option is (2) Statement-1 is correct, statement-2 is wrong.
2. Statement-2 is incorrect, as Urochordate belong to protochordata group where notochord is present only in tail of animal larva and notochord disappears in adult. In urochordates notochord is not replaced by vertebral column.

Teacher's Note:
1. Link this question to the matching NCERT topic and revise it.
2. The point to remember: Statement-1 is correct, statement-2 is wrong.

Answer: (d) Chordata → Protochordata → Urochordata

Explanation:
1. The correct option is (4) Chordata → Protochordata → Urochordata.
2. Phylum : Chordata 2 sub-groups Acraniata or Protochordata Craniata or Euchordata No brain box or cranium Cranium is present 2. sub-phylum sub-phylum Vertebrata Urochordata/Tunicata Cephalochordata Notochord is present only in Notochord extends from head larval tail to tail region e.g. Ascidia, Salpa, Herdmania e.g. Branchiostoma.

Teacher's Note:
1. Link this question to the matching NCERT topic and revise it.
2. The point to remember: Chordata → Protochordata → Urochordata.

Answer: (b) Test or tunic

Explanation:
1. The correct option is (2) Test or tunic.
2. In urochordates adult body is enclosed with in a leathery test or tunic formed of cellulose like organic substances termed tunicin, therefore urochordata is called tunicata.

Teacher's Note:
1. Link this question to the matching NCERT topic and revise it.
2. The point to remember: Test or tunic.

Answer: (d) Development is direct

Explanation:
1. The correct option is (4) Development is direct.
2. In urochordata, development is indirect. Larva of urochordata is free swimming which shows retrogressive metamorphosis.

Teacher's Note:
1. Link this question to the matching NCERT topic and revise it.
2. The point to remember: Development is direct.

Answer: (d) All of these

Explanation:
1. The correct option is (4) All of these.
2. In sub phylum cephalochordate, excretion occurs by protonephridia with solenocytes. Branchiostoma also called as Amphioxus or lancelet, due to both ends pointed like lance, they are called lancelet. Branchiostoma belong to sub-phylum cephalochordate. (Sub-phylum : Vertebrata).

Teacher's Note:
1. Link this question to the matching NCERT topic and revise it.
2. Check every option separately before choosing a combined answer.