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. Calcium
- B. Silica
- C. Both A and B
- D. None of these
Explanation: The skeletal structures of sponges are spicules and spongin fibres. Spicules are formed by carbonates of lime or silica in the form of…
Correct answer: Both A and B- A. The swimbladder of cartilaginous fish
- B. The swimbladder of bony fish
- C. The swimbladder of lobe-finned fish
- D. They evolved independently
Explanation: Lungfish have lungs that are derived from the swim bladder (an organ used for buoyancy in most bony fishes), which is connected to the…
Correct answer: The swimbladder of bony fish1183. Sycon is an example of:
- A. Platyhelminthes
- B. Annelids
- C. Protozoa
- D. Porifera
Explanation: Sycon is an example of Porifera. Porifera is a phylum of animals that are also known as sponges.
Correct answer: Porifera- A. Earthworm
- B. Scorpions
- C. Fish
- D. All of these
Explanation: Scorpions use structures known as book lungs for respiration. Book lungs are respiratory organs found in various arachnids, including…
Correct answer: Scorpions- A. Porifera
- B. Arthropoda
- C. Chordata
- D. Mollusca
Explanation: The second largest phylum of invertebrates is the Mollusca. Molluscs are a diverse group of animals that includes snails, clams…
Correct answer: Mollusca1186. Notochord occurs throughout life and all through the length of the body in which of the following?
- A. Hemichordata
- B. Urochordata
- C. Vertebrata
- D. Cephalochordata
Explanation: Notochord code occurs throughout life and all through the length of the body in cephalochordates.
Correct answer: Cephalochordata- A. Anthozoa
- B. Hydrozoa
- C. Scyphozoa
- D. Calcerea
Explanation: Calcarea is a group that does not contain polyps. Calcarea is a subclass of the phylum Porifera, which includes sponges.
Correct answer: Calcerea- A. Parietal mesoderm
- B. Visceral mesoderm
- C. Mesoderm
- D. Both a and b
Explanation: Coelom is a fluid-filled cavity lined by a mesodermal epithelium called mesothelium.
Correct answer: Both a and b- A. Rhabditis
- B. Ancylostoma duodenale
- C. Taenia solium
- D. Enterobius vermicularis
Explanation: Pinworm is a common name for Enterobius Vermicularis.
Correct answer: Enterobius vermicularis- A. Neomyxine
- B. Petromyzon
- C. Eptatretus
- D. Myxine
Explanation: The jawless fish that lays eggs in fresh water and its ammocoetes larvae after metamorphosis and returns to the ocean is Petromyzon.
Correct answer: Petromyzon- A. Exoskeleton
- B. Eyes
- C. Segmentation
- D. Bilateral symmetry
Explanation: The exoskeleton, or outer skeleton, is a key characteristic of insects that has contributed significantly to their diversification on…
Correct answer: Exoskeleton- A. Pristis
- B. Torpedo
- C. Trygon
- D. Scoliodon
Explanation: The marine cartilaginous fish that can produce electric current is Torpedo. It is also known as the electric ray.
Correct answer: Torpedo- A. Annelida
- B. Arthropoda
- C. Porifera
- D. Cnidaria
Explanation: Option A: This is the phylum of invertebrate animals thus this is the wrong option.Option B: This is the feature of a bilaterally…
Correct answer: Porifera- A. Spiral and determinate
- B. Spiral and indeterminate
- C. Radial and determinate
- D. Radial and indeterminate
Explanation: Option A: In spiral cleavage the division of cells in the developing embryo is in a spiral manner and blastomeres are not formed.
Correct answer: Radial and indeterminate- A. Annelida
- B. Coelenterates
- C. Echinodermata
- D. Platyhelminthes
Explanation: Flame cell/solenocytes are the main excretory structures of Platyhelminthes.OPTION A: Nephridia are the excretory organs in…
Correct answer: Platyhelminthes- A. Branching
- B. Symmetry
- C. Spicules
- D. Reproduction
Explanation: OPTION A: Phylum Porifera is not classified based on branching. Sponge species within this phylum can exhibit different growth forms…
Correct answer: Spicules- A. Aname
- B. Anemia
- C. Anima
- D. None of these options is correct
Explanation: The word "animal" comes from the Latin word, anima, meaning 'having breath', 'having soul' or 'living being'.
Correct answer: Anima- A. Kingdom
- B. Sub-kingdom
- C. Phylum
- D. Class
Explanation: The nematodes or roundworms constitute the phylum Nematoda, with plant-parasitic nematodes also known as eelworms.
Correct answer: Phylum- A. Starfish
- B. Jellyfish
- C. Cuttlefish
- D. Catfish
Explanation: Catfish are a diverse group of ray-finned fish. So, option D is the corrrect answer.
Correct answer: Catfish- A. Nematods
- B. Platyhelminthes
- C. Echinodermata
- D. None of these options are correct
Explanation: Annelids are the first group of invertebrates to have developed a closed circulatory system, and is not given as an option hence "D" is…
Correct answer: None of these options are correct