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Animal Kingdom · Question 42

NEET 2017MCQEasy📈 Topic in 75% papers+4−1
1

Important characteristic that hemichordates share with chordates is

  1. ventral tubular nerve cord
  2. pharynx with gill slits
  3. pharynx without gill slits
  4. absence of notochord

Answer

(2) pharynx with gill slits

Solution

Chordates have three fundamental features: a notochord, a dorsal hollow (tubular) nerve cord and paired pharyngeal gill slits.

⇒ As per NCERT, hemichordates have a rudimentary structure in the collar region called the stomochord, which is similar to the notochord; they are now placed as a separate phylum under non-chordata.

⇒ Respiration in hemichordates takes place through gills, i.e. they possess a pharynx with gill slits.

∴ The characteristic shared with chordates is the pharynx with gill slits.

Answer: (2)

NEET 2017

Keep practising — Animal Kingdom

2

Which among these is the correct combination of aquatic mammals?

  1. Dolphins, Seals, Trygon
  2. Whales, Dolphins, Seals
  3. Trygon, Whales, Seals
  4. Seals, Dolphins, Sharks
NEET 2017
3

In case of poriferans, the spongocoel is lined with flagellated cells called

  1. oscula
  2. choanocytes
  3. mesenchymal cells
  4. ostia
NEET 2017
4

In case of poriferans, the spongocoel is lined with flagellated cells called

  1. mesenchymal cells
  2. oscula
  3. ostia
  4. choanocytes
NEET 2017
5

Which of the following characteristic features always holds true for the corresponding group of animals?

  1. Possess a mouth with an upper and a lower jaw – Chordata
  2. 3-chambered heart with one incompletely divided ventricle – Reptilia
  3. Cartilaginous endoskeleton – Chondrichthyes
  4. Viviparous – Mammalia
NEET 2016 (Phase 1)
6

Which one of the following characteristics is not shared by birds and mammals?

  1. Viviparity
  2. Warm blooded nature
  3. Ossified endoskeleton
  4. Breathing using lungs
NEET 2016 (Phase 1)
7

Which of the following features is not present in the Phylum Arthropoda?

  1. Parapodia
  2. Jointed appendages
  3. Chitinous exoskeleton
  4. Metameric segmentation
NEET 2016 (Phase 1)
8

Which of the following features is not present in Periplaneta americana?

  1. Indeterminate and radial cleavage during embryonic development
  2. Schizocoelom as body cavity
  3. Metamerically segmented body
  4. Exoskeleton composed of N-acetylglucosamine
NEET 2016 (Phase 1)
9

Choose the correct statement

  1. All mammals are viviparous.
  2. All cyclostomes do not possess jaws and paired fins.
  3. All reptiles have a three-chambered heart.
  4. All pisces have gills covered by an operculum.
NEET 2016 (Phase 2)
10

Body having meshwork of cells, internal cavities lined with food filtering flagellated cells and indirect development are the characteristics of Phylum

  1. Mollusca
  2. Protozoa
  3. Coelenterata
  4. Porifera.
AIPMT 2015
11

Metagenesis refers to

  1. occurrence of a drastic change in form during post-embryonic development
  2. presence of a segmented body and parthenogenetic mode of reproduction
  3. presence of different morphic forms
  4. alternation of generation between asexual and sexual phases of an organism.
AIPMT 2015

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