Free Biodiversity and Variety of Life MCQs with Answers

1061. _ is a triploblastic organism.

• A. Jelly Fish
• B. Sea Anemone
• C. Tapeworm
• D. Corals

Explanation: Tapeworms are triploblastic organisms. They belong to the phylum Platyhelminthes and have three germ layers: ectoderm, mesoderm and endoderm. They are considered triploblastic.

1062. _ is also called liver fluke.

• A. Dugesia
• B. Fasciola
• C. Taenia
• D. Coral

Explanation: With few exceptions, the Platyhelminthes are parasites, mostly endoparasites, i.e., live inside their hosts. The most common examples are Taenia solium (tapeworm), Fasciola hepatica (liver luke), and Schistosoma (blood luke).

1063. Taenia is an endoparasite of humans, pigs, and cattle, which belongs to the phylum:

• A. Cnidaria
• B. Annelida
• C. Aschelminthes
• D. Platyhelminthes

Explanation: With few exceptions the Platyhelminthes are parasites, mostly endoparasites, i.e., live inside their hosts. The most common examples are Taenia solium (tapeworm).

1064. Reptiles flourished throughout_era.

• A. Cenozoic
• B. Devonian
• C. Proterozoic
• D. Mesozoic

Explanation: Reptiles flourished throughout the Mesozoic era (225-65 million years ago).

1065. It is an endoparasite of humans, cattle and pig that completes its life cycle in two hosts:

• A. Stingray
• B. Liver fluke (Fasciola)
• C. Aurelia
• D. Schistosoma

Explanation: The liver fluke (Fasciola hepatica) is an endoparasite of humans, cattle, and sheep. It completes its life cycle using two hosts: a snail as the intermediate host and a mammal (human, cattle, or sheep) as the definitive host. Tapeworms (Taenia) also infect humans and animals but usually require only one intermediate host, and Aurelia (jellyfish) and Schistosoma (blood fluke) have different life cycles.

1066. Book lungs are present in arthropods for exchange of gases in class:

• A. Crustacea
• B. Insecta
• C. Myriapoda
• D. Arachnida

Explanation: Respiration in class arachnida is by gills or special structures called book lungs.

1067. Following group is the example of acoelomates:

• A. Annelids
• B. Aschelminthes
• C. Molluscs
• D. Platyhelminthes

Explanation: The Platyhelminthes are acoelomate flatworms: their bodies are solid between the outer surface and the cavity of the digestive system

1068. Which one of the following is a fish?

• A. Flying fish
• B. Salmon
• C. Sea horse
• D. All of the above

Explanation: Salmon, flying fish, and sea horse (Hippocampus) are all fishes and come under Pisces. They are cold-blooded animals and they possess two-chambered hearts. So, the correct answer is option D.

1069. The Porifera are pore - bearing animals, commonly called:

• A. Corals
• B. Sponges
• C. Hydras
• D. Anemones

Explanation: Factual recall. Sponges have numerous pores called ostia and hence are known as porifera. Option A is scientifically referred to as the class anthozoa within the phylum cnidaria. Option C is scientifically referred to as the phylum Coelenterata. Option D is scientifically referred to be within the phylum Cnidaria.

1070. Which of the following have a visceral mass and a muscular foot?

• A. Medusoids
• B. Annelida
• C. Aschelminthes
• D. Mollusca
• E. Arthropoda

Explanation: Mollusca is a phylum that includes organisms like snails, clams, squids, and octopuses. They possess a visceral mass, which contains the internal organs, and a muscular foot, which is used for locomotion.