Free Biodiversity and Variety of Life MCQs with Answers

2921. Taxonomy includes the arrangement of organisms into different taxa. Which of the following represents the correct hierarchy of various taxa of classification?

• A. Species, genus, family, order, class, phylum
• B. Order, family, class, phylum, kingdom
• C. Species, genus, family, class, order, phylum
• D. Species, genus, order, family, class, phylum

Explanation: The correct hierarchy of various taxa in biological classification is:Species, genus, family, order, class, phylumExplanation:1. Species: The fundamental unit of classification, consisting of organisms that can interbreed and produce fertile offspring.2. Genus: A group of closely related species.3. Family: A group of related genera.4. Order: A group of related families.5. Class: A group of related orders.6. Phylum: A group of related classes.This hierarchical arrangement helps organize and categorize living organisms based on their evolutionary relationships.Mnemonics, that one can use to memorize the taxonomic hierarchy, which is Domain, Kingdom, Phylum, Class, Order, Family, Genus, and Species, in that specific order are as follows:-"Dear King Philip Came Over For Good Soup" (the first letter of each word corresponds to a taxa)- Kingdom Phylum went to a Class and Ordered his Family to look for a Genius(Genus) who is a rare Species.The diagram, given below, illustrates the hierarchy.

2922. Which of the following are called placental mammals?

• A. Prototheria
• B. Metatheria.
• C. Eutheria.
• D. All of these.

Explanation: c) Eutheria: This is the correct option. Eutheria, also known as placental mammals, are a diverse group of mammals that give birth to more fully developed live young. These mammals have a placenta that provides nourishment and support to the developing embryo inside the mother's womb.

2923. Name the class without antennae.

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

Explanation: a) Arachnida: Arachnids are a class of arthropods that include spiders, scorpions, ticks, and mites. Arachnids typically do not have antennae. Instead, they have specialized structures called pedipalps that serve sensory and feeding functions.

2924. Which of the following damages wooden ships?

• A. Sepia.
• B. Teredo.
• C. Limax.
• D. Ostrea.

Explanation: Teredo is one of the genera wood-boring bivalve shipworms.

2925. Which of the following do not have a body cavity?

• A. Pseudocoelomata
• B. Coelomata
• C. Acoelomata
• D. None of these

Explanation: Acoelomate is an animal that does not possess a body cavity

2926. Larvae of which group are similar to chordates?

• A. Echinodermata
• B. Annelida
• C. Arthropoda
• D. Nematoda

Explanation: Option[A] The larvae of echinodermata [called dipleurula larva] are characterized by bilateral symmetry. The larvae of chordates[ tornaria larva] also have bilateral symmetry so option [A] IS RIGHT.The other options are eliminated as follows:Option [B] Annelida has a free swimming trochophore larvae which is different from that of chordates.Option [C] Arthropods have larva [called instar or nymph] that is different from larvae of chordates.Option [D] Nematoda has a larval stage during their life cycle which is quite different from chordates.

2927. Taenia is an endoparasite of human, pig and cattle which belongs to thethatpigs,humans phylum.

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

Explanation: Intracellular parasites are endoparasites that live within the cell of the host.

2928. The body of _ consists of segments called proglottis, which contain mainly sexual organs.

• A. Planaria
• B. Ascaris
• C. Fasciola
• D. Tapeworm

Explanation: Proglottid can be defined as each segment in the strobils of a tapeworm containing a complete sexually mature reproductive system.

2929. _ is a common parasite of the intestine of human and pigshumans that belongs to the phylum nematode.

• A. Taenia solanum
• B. Schistosoma
• C. Ascaris lumbriocoides
• D. Fasciola hepatica

Explanation: Ascaris belongs to phylum Nematode. It is a parasitic worm. It causes ascariasis disease.

2930. _ is an intestinal parasite of man belonging to phylum Nematoda.

• A. Taenia solium
• B. Wuchereria bancrofti
• C. Ascaris lumbricoides
• D. Schistosoma

Explanation: Ascaris Lumbricoides is a large, parasitic roundworm known for surviving in the human intestine. Ascaris lumbricoides is a roundworm which belongs to Phylum Nematoda.