Free Biodiversity and Variety of Life MCQs with Answers
3,130 Biodiversity and Variety of Life MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Biological classification uses taxonomic ranks, binomial nomenclature and shared characteristics to organize life into kingdoms. The major groups include prokaryotes, protists, fungi, plants and animals, with comparisons based on cell type, cell wall, nutrition, body organization, reproduction and evolutionary relationships; prokaryotes lack a membrane-bound nucleus.
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- A. Super female
- B. Super male
- C. Intersex
- D. Gynandromorph
Explanation: Gynandromorph (hermaphrodite) is an animal that possesses both male and female characteristics. An example is the earthworm.
Correct answer: Gynandromorph- A. Body wall and ectoderm
- B. Ectoderm and endoderm
- C. Mesoderm and body wall (endoderm)
- D. Mesoderm and ectoderm.
Explanation: Coelom is a fluid filled cavity that forms the main body cavity of vertebrate and most invertebrate animals.
Correct answer: Mesoderm and body wall (endoderm)- A. sharks
- B. Ranas
- C. Pigeons
- D. Whales
Explanation: The pneumatic bone is present in the pigeon to keep the bones light weight because the pigeon has to fly.
Correct answer: Pigeons- A. Nematoblasts of Hydra
- B. Flame cells of Planaria
- C. Gills of prawn
- D. Trachea of insects.
Explanation: Analogous organs are organs of very disparate organisms that are superficially similar but have evolved from vastly different origins.
Correct answer: Flame cells of Planaria- A. They undergo no moulting
- B. They have seven cervical vertebrae
- C. They are carnivores
- D. They have ventral nerve cords
Explanation: Mammals do not undergo moulting. Moulting is usually exhibited by invertebrates.
Correct answer: They undergo no moulting- A. Mollusca
- B. Acanthocephala
- C. Cestoda
- D. Chordata
Explanation: The term 'metamerism' refers to a linear repetition of parts in an animal body.
Correct answer: Chordata- A. One single opening to the digestive canal
- B. Cilia on the surface to create water current
- C. Radial symmetry
- D. Asymmetrical body
Explanation: The organisms attached to the substratum possess radial symmetry in all vertical planes. All the animals belonging to cnidaria (e.g.
Correct answer: Radial symmetry- A. Sacral nerves
- B. 3rd, 7th, 9th and 10th cranial nerves
- C. Thoracolumbar nerves
- D. Cervical nerves
Explanation: The sympathetic nervous system forms a part of autonomic nervous system that consists of nerves which connect the visceral receptors and…
Correct answer: Thoracolumbar nerves- A. The division of body into the head, neck, trunk and tail.
- B. The body covered with an exoskeleton
- C. The possession of two pairs of functional appendages
- D. The presence of well developed skull
Explanation: The subphylum vertebrata or craniata has a well developed central nervous system that is differentiated into the brain and spinal cord.
Correct answer: The presence of well developed skull- A. Polymorphism
- B. Flame cells
- C. Hermaphroditism
- D. Nematocysts
Explanation: The cells characteristic of the coelenterates include stinging cells (cnidocytes or cnidoblasts or nematoblasts) for offence and defence.
Correct answer: Nematocysts- A. Plasmodium
- B. Schistosoma
- C. Trypanosoma
- D. Wuchereria
Explanation: Platyhelminthes have soft and dorsoventrally flattened body with bilateral symmetry.
Correct answer: Schistosoma- A. Tape worm
- B. Mosquito
- C. sea anemone
- D. leech
Explanation: Sea anemone is a completely non-parasitic form. It shows the example of mutualism. Sea anemone attaches itself to shell of a hermit crab.
Correct answer: sea anemone- A. starfish
- B. Jellyfish
- C. Crayfish
- D. Cuttlefish
Explanation: Starfish belongs to the phylum echinodermata who have developed tube feet for locomotion.
Correct answer: starfish- A. Birds and lizards
- B. Frogs and cartilaginous fish
- C. Insects and bony fish
- D. mammals and molluscs
Explanation: Birds and lizards are uricotelic. Uricotelic animals are those that excrete nitrogenous waste in the form of uric acid.
Correct answer: Birds and lizards- A. Frog's tadpole
- B. Prawn
- C. Chelifer
- D. Cockroach
Explanation: In the open circulatory system, the blood is not confined to the blood vessels, but it flows in the open spaces.
Correct answer: Frog's tadpole- A. Running birds
- B. Migratory birds
- C. Flightless birds
- D. Four toed birds
- E. A and c
Explanation: The ostrich is a flightless bird native to Africa. It is the only living species of its family.
Correct answer: A and c- A. Trichocyst in Paramecium
- B. Pedicellariae of star fish
- C. Clitellum in Pheretima
- D. Posterior sucker in Hirudinaria
Explanation: The looping or crawling movement in Hirudinaria is performed with the help of muscles and suckers which serve for attachment.
Correct answer: Posterior sucker in Hirudinaria- A. Hydra
- B. Tapeworm
- C. Earthworm
- D. Frog's tadpole
Explanation: Hydra possesses a very primitive type of nervous system. It includes bipolar and multipolar nerve cells or neurones lying immediately…
Correct answer: Hydra- A. Starfish and Hydra
- B. Hydra and sponges
- C. Tapeworm and Hydra
- D. Sponge and starfish
Explanation: Budding is an asexual mode of reproduction in Hydra and sponges. Buds are formed as outgrowths on the body surface and then detached to…
Correct answer: Hydra and sponges- A. Paried nature
- B. Noncollapsible walls
- C. Ciliated inner lining
- D. Origin from head
Explanation: Tracheae act as passage of air during respiration in both cockroach and mammals.
Correct answer: Noncollapsible walls