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Cell

Description: classification, structure, characteristics, etc
Number of Questions: 17
Created by:
Tags: Zoology Cell: Structure and Function Cell:The Unit of Life
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Radial symmetry type of body plan is not seen in which of the following living organisms?

  1. Coelenterates

  2. Ctenophores

  3. Echinoderms

  4. Sponges

  5. None of these


Correct Option: D
Explanation:

Sponges are mostly asymmetrical, i.e. any plane that passes through the centre does not divide them into equal halves.

Presence of ciliated comb plates is a characteristic of which of the following animals?

  1. Pennatula

  2. Ctenoplana

  3. Obelia

  4. Planaria

  5. Sycon


Correct Option: B
Explanation:

Ctenoplana belongs to phylum Ctenophora. It body bears eight external rows of ciliated comb plates, which help in locomotion.

In which of the following living organisms is the tissue level of organization seen?

  1. Sponges

  2. Coelenterates

  3. Echinoderms

  4. Platyhelminths

  5. Annelids


Correct Option: B
Explanation:

In coelenterates, the arrangement of cells is more complex. Here, the cells performing the same function are arranged into tissues, hence is called tissue level of organization.

Which of the following phyla possess all the three germinal layers?

  1. Porifera

  2. Coelentrata

  3. Platyhelminthes

  4. Cnidaria

  5. None of these


Correct Option: C
Explanation:

Those animals in which the developing embryo has a third germinal layer, mesoderm, in between the ectoderm and endoderm, are called triploblastic animals e.g. platyhelminthes to chordates.

Presence of specialised cells, called flame cells, is a feature of which of the following organisms?

  1. Coelenterates

  2. Ctenophores

  3. Flatworms

  4. Roundworms

  5. Annelids


Correct Option: C
Explanation:

Specialised cells called flame cells that help in osmoregulation and excretion are present in flatworms (platyhelminthes).

Which of the following combinations is not correct?

  1. Physalia : Portuguese man-of-war

  2. Adamsia : Sea anemone

  3. Pennatula : Sea pen

  4. Gorgonia : Sea fan

  5. Meandrina : Sea leather


Correct Option: E
Explanation:

Meandrina is called as Brain coral.

Which of the following names of different worms is mismatched?

  1. Taenia : Tapeworm

  2. Ascaris : Roundworm

  3. Wuchereria : Filaria worm

  4. Ancylostoma : Pinworm

  5. Faciola : Liverfluke


Correct Option: D
Explanation:

Ancylostoma is known as Hookworm because it has hooks on head region. It sucks blood from the host. 

Which of the following statements is true about cnidarians that exhibit metagenesis?

  1. Polyps produce medusae asexually and medusae form the polyps sexually.

  2. Polyps produce medusae asexually as well as sexually.

  3. Medusae form the polyps sexually as well as asexually but polyps produce medusae only asexually.

  4. Polyps form the medusae sexually as well as asexually but medusae produce polyps only asexually.

  5. Medusae produce polyps asexually and polyps form the medusae sexually.


Correct Option: A
Explanation:

Those cnidarians which exist in both forms exhibit alternation of generation, known as Metagenesis, i.e. polyps produce medusae asexually and medusae form the polyps sexually (e.g. Obelia).

Which of the following animal species is an arthopod?

  1. Earthworm

  2. Hookworm

  3. Silkworm

  4. Chiton

  5. Tusk shell


Correct Option: C
Explanation:

Silkworm (Bombyx) belongs to phylum Arthopoda.

Which of the following members of the animal kingdom are bilaterally symmetrical, triploblastic, segmented and coelomate?

  1. Platyhelminthes

  2. Aschelminthes

  3. Arthropoda

  4. Molluscs

  5. Echinoderms


Correct Option: C
Explanation:

Arthropods are bilaterally symmetrical, triploblastic, segmented and coelomate animals.

Notochord is present only in larval stage of which of the following species?

  1. Salpa

  2. Amphioxus

  3. Balanoglossus

  4. Saccoglossus

  5. Petromyzon


Correct Option: A
Explanation:

Salpa belongs to Urochordata. In Urochordata, notochord is present only in larval tail.

Scales and paired fins are not found on the body of which of the following species?

  1. Hagfish

  2. Angel fish

  3. Fighting fish

  4. Saw fish

  5. Dog fish


Correct Option: A
Explanation:

Hagfish (Myxine) belongs to Class–Cyclostomata. Theirbody is devoid of scales and paired fins.

Which of the following statements is not true about chordates?

  1. Notochord is present

  2. Central nervous system is dorsal, hollow and single

  3. Gill slits are absent

  4. Heart is ventral

  5. A postanal part (tail) is present


Correct Option: C
Explanation:

Pharynx is perforated by gill slits in chordates while gill slits are absent in non-chordates.

Heart is four-chambered in which of the following species?

  1. Crocodile

  2. Tortoise

  3. Lizard

  4. Viper

  5. Frog


Correct Option: A
Explanation:

Crocodile belongs to Class–Reptilia. Heart is usually three-chambered, but four-chambered in crocodiles.

Internal fertilisation is seen in which of the following species?

  1. Saw fish

  2. Sea horse

  3. Flying fish

  4. Salamander

  5. Angel fish


Correct Option: A
Explanation:

Pristis (Saw fish) belongs to Class–Chondrichthyes. Theyhave internal fertilisation and many of them are viviparous.

Water vascular system is the characteristic of which of the following phylum?

  1. Porifera

  2. Ctenophora

  3. Mollusca

  4. Echinodermata

  5. Chordata


Correct Option: D
Explanation:

The most distinctive feature of echinoderms is the presence of water vascular system which helps in locomotion, capture and transport of food and respiration.

Which of the following species is a viviparous mammal?

  1. Ornithorhynchus

  2. Macropus

  3. Pteropus

  4. Balaenoptera

  5. Delphinus


Correct Option: A
Explanation:

All mammals are viviparous with few exceptions e.g. Ornithorhynchus (Platypus).

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