Biology ยท Science General

Diversity in Living Organisms

3,323 Questions

The diversity in living organisms deals with the classification of life forms into various kingdoms and phyla. This topic covers specific traits of bacteria, animal body cavities, and structural adaptations for survival. These fundamentals are crucial for biology sections in medical entrance and state board exams.

Animal phyla characteristicsBacteria and flagellaBiological adaptationsKingdom Animalia classificationBody cavity typesExtinct organism subphylaJawless animals identification

Diversity in Living Organisms Questions

Multiple choice

Snails and slugs belong to a group of animals called

  1. Moluscs

  2. Worms

  3. Cnidarians

  4. Arthropods

  5. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Snails and slugs belong to the phylum Mollusca (despite the typo 'Moluscs' in the option). They are characterized by soft, unsegmented bodies, often with a hard shell (though slugs have lost this trait through evolution). Worms are not a single taxonomic group, cnidarians include jellyfish and corals, and arthropods have jointed legs and exoskeletons.

Multiple choice

All of the following are arthropods except

  1. Clam worms

  2. Centipedes

  3. Crabs

  4. Spiders

  5. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Clam worms (polychaete annelids) are segmented worms, not arthropods. Arthropods are characterized by jointed appendages, segmented bodies, and exoskeletons made of chitin. Centipedes, crabs, and spiders are all arthropods - centipedes and millipedes are myriapods, crabs are crustaceans, and spiders are arachnids.

Multiple choice

Segmented worms are known as

  1. Nematods

  2. Pianarians

  3. Annelids

  4. Arthropods

  5. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Segmented worms are called annelids. They are characterized by body segmentation (repeated similar units), which distinguishes them from roundworms (nematodes) and flatworms (planarians - misspelled here). Arthropods also have segmentation but are distinguished by jointed appendages and chitinous exoskeletons.

Multiple choice

The canal system is a characteristic feature of

  1. echinoderms

  2. sponges

  3. coelenterates

  4. mollusks

  5. fish
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

All the cavities in a sponge's body are intercommunicating and are collectively referred to as the canal system. Thus, the canal system helps the sponge in nutrition, respiration and excretion.

Multiple choice

Which kingdom organisms exhibit two body forms?

  1. Cnidaria

  2. Platyhelminthes

  3. Mollusca

  4. Echinodermata

  5. Arthropoda
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Polyp and medusa - names for the two body forms, one non motile and one typically free swimming, found in the aquatic invertebrate phylum cnidaria.