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. Choanocytes
- B. Pinacocytes
- C. Mesenchymal cells
- D. Cnidocyte
Explanation: The outer body wall of sponges is made up of pinacocytes, which form a protective layer and cover the exterior surface of the sponge.
Correct answer: Pinacocytes1122. Open circulatory system is present in: (I) Arthropods. (II) Annelids. (III) Chordates. (IV) Molluscs
- A. III only
- B. III and II only
- C. I and IV only
- D. IV only
- E. I only
Explanation: The species in the phylum arthropoda have an open circulatory system. Open circulatory systems work by pumping the blood into a hemocoel.
Correct answer: I and IV only- A. Triploblastic
- B. Diploblastic
- C. Radioblast
- D. All of these
Explanation: Characteristics of the radiata is that they are diploblastic. Diploblastic organisms only have two embryonic tissues layers; endoderm and…
Correct answer: Diploblastic- A. Platyhelminthes
- B. Aschelminthes
- C. Annelida
- D. Hemichordata
Explanation: In enterocoelous animals, the coelom is formed from pouches pinched off from the digestive tract which is also known as the embryonic gut…
Correct answer: Hemichordata- A. Pharynx without gill slits
- B. Absence of notochord
- C. Ventral tubular nerve cord
- D. Pharynx with gill slits
Explanation: Animal belongs to phylum Chordata is characterized by the presence of the notochord, dorsal hollow nerve cord and pharyngeal gill slits.
Correct answer: Pharynx with gill slits- A. Reptiles
- B. Mammals
- C. Frog
- D. Duckbill platypus
Explanation: The Duckbill platypus is a unique mammal that has webbed feet and a body covered with waterproof dense fur. She lays 1 to 3 eggs.
Correct answer: Duckbill platypus- A. Protozoa
- B. Porifera
- C. Cnidaria
- D. All of these
Explanation: 'Radial symmetry' is the arrangement of body parts around a central axis and is only present in grade radiata.
Correct answer: Cnidaria- A. Insects
- B. Arachnids
- C. Crustaceans
- D. Arachnids and Crustaceans
Explanation: 'Aquatic arthropods' (crustaceans and the chelicerate horseshoe crabs) possess gills for respiration.
Correct answer: Crustaceans- A. Earthworm
- B. Jelly fish
- C. Sycon
- D. Planaria
Explanation: 'Eucoelomates' are those organisms having a body cavity that is a coelom - distinguished from acoelomate and pseudocoelomate.
Correct answer: Earthworm- A. Spiral and determinate
- B. Spiral and indeterminate
- C. Radial and determinate
- D. Radial and indeterminate
Explanation: The answer is Radial and indeterminate. In radial cleavage, the cells divide along a vertical axis, creating a stack of cells.
Correct answer: Radial and indeterminate- A. Excretory system
- B. Digestive system
- C. Circulatory system
- D. Nervous system
Explanation: Option C: Annelids have a closed circulatory system, which means the blood circulates through a closed network of blood vessels.
Correct answer: Excretory system- A. Alligator
- B. Penguin
- C. Porcupine
- D. Spiny anteater
Explanation: 'Spiny anteater', species of Australia, are an example of a 'Prototherian'.
Correct answer: Spiny anteater- A. Ectoderm
- B. Endoderm
- C. Uterus
- D. Mesenchyme
Explanation: Some sponge species reproduce sexually. These are mostly hermaphrodite, mostly protandrous, i.e. male sex cells develop first.
Correct answer: Mesenchyme- A. Porous walls
- B. Gastrovascular system
- C. Reproduction
- D. Folding of inner walls
Explanation: Option A: As explained above this option is incorrect.Option B: As explained above this option is incorrect.Option C: As explained above…
Correct answer: Folding of inner walls- A. Neries
- B. Stylaria
- C. Earthworm
- D. Leech
Explanation: The most common marine worms belong to the phylum Annelida. They are distinguished by the little rings or segments that make up their…
Correct answer: Neries- A. Gastropoda
- B. Cephalopoda
- C. Pelecypoda
- D. Scaphopoda
Explanation: The octopus is an organism that belongs to the group of mollusks. They belong to the class cephalopods.
Correct answer: Cephalopoda- A. Pisces:Jellyfish
- B. Echinodermata:Cuttlefish
- C. Mollusca:Starfish
- D. Arthropoda:Silver fish
Explanation: The scientific name of the silver fish is Lepisma saccharina. They belong to the phylum Arthropoda and the class Insecta.
Correct answer: Arthropoda:Silver fish- A. Duckbill platypus
- B. Spiny anteater
- C. Wolves
- D. Both Options A and B are correct
Explanation: Platypus, also called the duck-billed platypus, is a mammal, and the spiny anteater, also called the spiny anteater, is also an egg-laying…
Correct answer: Both Options A and B are correct- A. Chordates
- B. Annelids
- C. Cnidarian
- D. Round worms
Explanation: Radial symmetry means the organisms that can be divided into two equal parts so the answer is option C.
Correct answer: Cnidarian- A. They are both acoelmates
- B. They are both triploblastic
- C. They both show bilateral symmetry
- D. They are both worms
Explanation: Flatworms belong to the phylum Platyhelminthes. They do not have a coelom, respiratory system or a circulatory system.Tapeworms flukes are…
Correct answer: They are both acoelmates