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Animal Kingdom · Question 52

AIPMT 2015MCQEasy📈 Topic in 0% papers+4−1
1

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.

Answer

(4) alternation of generation between asexual and sexual phases of an organism.

Solution

As per NCERT, some cnidarians, e.g., Obelia, exhibit alternation of generation (Metagenesis), i.e., polyps produce medusae asexually and medusae form the polyps sexually.

∵ A drastic change in form during post-embryonic development is metamorphosis and different morphic forms is polymorphism, options (1) and (3) are not metagenesis.

Answer: (4)

AIPMT 2015

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2

A jawless fish, which lays eggs in fresh water and whose ammocoetes larvae after metamorphosis return to the ocean is

  1. Neomyxine
  2. Petromyzon
  3. Eptatretus
  4. Myxine
AIPMT 2015
3

Which of the following endoparasites of humans does show viviparity?

  1. Trichinella spiralis
  2. Ascaris lumbricoides
  3. Ancylostoma duodenale
  4. Enterobius vermicularis
AIPMT 2015 (Cancelled)
4

Which of the following represents the correct combination without any exception? (Characteristics – Class)

  1. Sucking and circular mouth; jaws absent, integument without scales; paired appendages. – Cyclostomata
  2. Body covered with feathers; skin moist and glandular, forelimbs form wings; lungs with air sacs. – Aves
  3. Mammary gland; hair on body; pinnae; two pairs of limbs. – Mammalia
  4. Mouth ventral; gills without operculum; skin with placoid scales; persistent notochord. – Chondrichthyes
AIPMT 2015 (Cancelled)
5

Which of the following animals is not viviparous?

  1. Platypus
  2. Whale
  3. Flying fox (Bat)
  4. Elephant
AIPMT 2015 (Cancelled)
6

Which of the following characteristics is mainly responsible for diversification of insects on land?

  1. Exoskeleton
  2. Eyes
  3. Segmentation
  4. Bilateral symmetry
AIPMT 2015 (Cancelled)
7

Select the taxon mentioned that represents both marine and fresh water species.

  1. Echinoderms
  2. Ctenophora
  3. Cephalochordata
  4. Cnidaria
AIPMT 2014
8

Which one of the following living organisms completely lacks a cell wall?

  1. Cyanobacteria
  2. Sea-fan ( Gorgonia)
  3. Saccharomyces
  4. Blue-green algae
AIPMT 2014
9

Planaria possesses high capacity of

  1. metamorphosis
  2. regeneration
  3. alternation of generation
  4. bioluminescence.
AIPMT 2014
10

Planaria possesses high capacity of

  1. alternation of generation
  2. regeneration
  3. bioluminescence.
  4. metamorphosis
AIPMT 2014
11

A marine cartilaginous fish that can produce electric current is

  1. Pristis
  2. Torpedo
  3. Trygon
  4. Scoliodon.
AIPMT 2014

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