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. Porifera
- B. Annelida
- C. Cnidaria
- D. Arthropoda
Explanation: Polymorphism is a characteristic found in members of the phylum Cnidaria.
Correct answer: Cnidaria1382. Hydra belongs to phylum:
- A. Mollusca
- B. Annelida
- C. Cnidaria
- D. Arthropoda
Explanation: Hydra is a genus of small, freshwater organisms belonging to the phylum Cnidaria.
Correct answer: Cnidaria- A. Nephron
- B. Flame cells
- C. Nephridia
- D. Ganglia
Explanation: The excretory system of flatworms is composed of specialized structures called flame cells, also known as protonephridia.
Correct answer: Flame cells- A. Flame cells
- B. Malpighian tubules
- C. Nephridia
- D. Nephrons
Explanation: The excretory system in arthropods is composed of specialized structures called Malpighian tubules.
Correct answer: Malpighian tubules- A. Acoelomates
- B. Pseudococlomates
- C. Coelomates
- D. Mesoderms
Explanation: Animals that have their body cavity filled with parenchyma are called "acoelomates." Parenchyma refers to the tissue that fills the space…
Correct answer: Acoelomates- A. Syrinx
- B. Tongue
- C. Larynx
- D. Pharynx
Explanation: The syrinx is the voice box of birds. It is a specialized vocal organ located at the base of a bird's trachea where the trachea splits…
Correct answer: Syrinx- A. Blastopore
- B. Plastoquinone
- C. Splitting of mesoderm
- D. Blastocoel
Explanation: Blastocoel gives rise to pseudocoelom. Pseudocoelom is not homologous to true coelom because: it is not lined by coelomic epithelium.
Correct answer: Blastocoel- A. Armada
- B. Cnidaria
- C. Porifera
- D. Protozoa
Explanation: The simplest of the animals belong to subkingdom Parazoa (phylum Porifera).
Correct answer: Porifera- A. Mesoderm
- B. Endoderm
- C. Mesoglea
- D. Ectoderm
Explanation: Option B is correct.The gut of acoelomates develops from the endoderm. The endoderm is the innermost of the three germ layers that form…
Correct answer: Endoderm- A. They may be coelomate pseudocoelomate or acoelomate
- B. They are included in grade bilateria
- C. All of them have digestive system
- D. All of them have blood vascular system
Explanation: Not all Triploblasts have vascular systems, but all of them have digestive systems, are included in grade bilateria, and may be coelomate…
Correct answer: They may be coelomate pseudocoelomate or acoelomate- A. Protostomes
- B. Diploblastic
- C. Deuterostomes
- D. Acoelomates
Explanation: Mesoderm is derived from the wall of developing gut archenteron in series Deutrostomia.
Correct answer: Deuterostomes- A. Squid
- B. Spider
- C. Octopus
- D. Armillaria
Explanation: The largest invertebrate known to science is the giant squid. This animal belongs to the phylum Mollusca and the class Cephalopoda.
Correct answer: Squid- A. Hydra
- B. Euplectella
- C. Blood fluke
- D. A and B
Explanation: Hydra and Euplectella do not show division of labor because they have a very simple body organization.
Correct answer: A and B1394. Placenta is related to:
- A. Sheep
- B. Spiny ant eater
- C. Duck bill platypus
- D. Kangaroo
Explanation: The correct answer is Sheep. Sheep are placental mammals, meaning they have a placenta that provides nutrients and oxygen to the…
Correct answer: Sheep- A. Coelenterates
- B. Platyhelminthes
- C. Annelids
- D. Aschelminthes
Explanation: The pseudocoelom is a characteristic body cavity found in animals belonging to the phylum Aschelminthes, also known as Nemathelminthes.
Correct answer: Aschelminthes- A. Cnidaria
- B. Annelida
- C. Platyhelminthes
- D. Echinodermata
Explanation: Polymorphism is a characteristic in which animals of the same species exist in two or more distinct forms, each performing different…
Correct answer: Cnidaria- A. Ostia
- B. Osculum
- C. Sponogocoel
- D. Both a and b
Explanation: The osculum is the large opening in a sponge through which water exits after passing through the sponge's body for the purpose of filter…
Correct answer: Osculum- A. Stipules
- B. Brails
- C. Spines
- D. Spicules
Explanation: Based on the explanations provided, the correct answer to the question is option D) Spicules.
Correct answer: Spicules- A. Sycon
- B. Leech
- C. Mites
- D. Aurelia
Explanation: Aurelia is a genus of jellyfish, and jellyfish are classified under the phylum Cnidaria.
Correct answer: Aurelia- A. All animal are ingestive heterotrophs
- B. It is the largest kingdom
- C. All animal are eukaryotes
- D. All animals develop from the similar gametes
Explanation: Animals do not necessarily develop from similar gametes. While sexual reproduction involves the fusion of gametes (sperm and egg cells)…
Correct answer: All animals develop from the similar gametes