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. Visceral mesoderm
- B. Parietal mesoderm
- C. Splanchine mesoderm
- D. Endoderm
Explanation: The visceral mesoderm is a layer of the mesoderm in embryonic development that surrounds and supports the internal organs or viscera…
Correct answer: Visceral mesoderm- A. Excretory system
- B. Respiratory system
- C. Digestive system
- D. Osmoregulatory system
Explanation: Acoelomate has sac type digestive system, no respiratory and osmoregulatory systems.
Correct answer: Excretory system- A. Pinworm
- B. Star fish
- C. Cake urchin
- D. Amphioxus
Explanation: Spiral and determinate type cleavage is present in proterostomes. Pinworm belongs to phylum. Aschelminthes that are proterostomes
Correct answer: Pinworm- A. Echinodermata
- B. Mollusca
- C. Chordata
- D. Hemichordata
Explanation: Molluscs are proterostomes and have determinate cleavage in which fate of blastomeres is foretold.
Correct answer: Mollusca- A. Bilaterally symmetrical
- B. Triploblastic metazoan
- C. Dorsoventrally compressel body
- D. Radially symmarical body
Explanation: Phylum Platyhelminthes have bilateral symmetry. This means there is only one plane of symmetry.
Correct answer: Radially symmarical body- A. Chitin
- B. Cuticle
- C. Cilia
- D. Spongin
Explanation: Intestinal parasites, generally do not absorb nutrients through the body surface as there is usually a thick cuticle to protect themselves…
Correct answer: Cuticle- A. Mouth
- B. Pharynx
- C. Laynx
- D. Anus
Explanation: The nematode nervous system consists of a set of neuronal processes that run lengthwise on the nematode body.
Correct answer: Pharynx- A. Setae, parapodia
- B. Parapodia, setae
- C. Setae
- D. Setae, chaetae
Explanation: Locomotary setae are for crawling and are the bristles that are visible on the exterior of the earthworm.
Correct answer: Parapodia, setae- A. Phylum Mollusca
- B. Phylum Porifera
- C. Phylum Annelida
- D. Phylum Arthropoda
Explanation: More than 50% of total biodiversity of our planet is formed by the Arthropods.
Correct answer: Phylum Arthropoda890. Natural silk is not:
- A. A protein
- B. Produced by modified salivary glands
- C. Obtained from an insect
- D. Glycolipid in nature
Explanation: Natural silk is fibrous protein produced by larvae of silk worm.
Correct answer: Glycolipid in nature- A. Muscle feet
- B. Jet propulsion
- C. Parapodia
- D. Tube feet
Explanation: Organs of locomotion in echinoderms are tube feet. These are present along the edges of grooves present in the arms.
Correct answer: Tube feet- A. Echinoderms
- B. Hemichordates
- C. Arthropods
- D. Chordates
Explanation: Arthropods are proterostomes in which cleavage is determinate (fate of blastomeres is foretold).
Correct answer: Arthropods- A. Man
- B. Snail
- C. Sheep
- D. Dog
Explanation: Sheep is the primary host of liver fluke.
Correct answer: Sheep- A. Liver fluke
- B. Tapeworm
- C. Dugesia
- D. Schistosoma
Explanation: Dugesia are camivores, and they eat other small invertebrates and dead or decaying animals.
Correct answer: Dugesia- A. Coelenterates
- B. Porifera
- C. Arthropoda
- D. Platyhelminthes
Explanation: Polymorphism refers to the occurrence of structurally and functionally more than two different types of individuals within the same…
Correct answer: Coelenterates- A. Coelom
- B. Pseudocoelom
- C. Haemocoel
- D. Enteron
Explanation: In arthropods, the body cavity is in the form of haemocoel.
Correct answer: Haemocoel- A. Ascaris lumbericoides
- B. Pheretima posthuma
- C. Lumbericus terresaris
- D. Hirudo medicinalis
Explanation: Ascaris worms inhabit the lumen of the small intestine, usually in the jejunum or ileus.
Correct answer: Ascaris lumbericoides- A. Hydra
- B. Obelia
- C. Starfish
- D. Euplectella
Explanation: Polymorphism refers to the occurrence of structurally and functionally more than two different types of individuals within the same…
Correct answer: Obelia- A. Sessile
- B. Active
- C. Streamlined
- D. Parasitic
Explanation: In radial symmetry all body parts are arranged around the central axis. Radial symmetry represents sessile mode of life.
Correct answer: Sessile- A. Planaria
- B. Earthworm
- C. Tapeworm
- D. Ascaris
Explanation: Ascaris belong to the phylum Nematoda of super phylum Aschelminthes. They have a cylindrical body without showing any metamerism, a…
Correct answer: Ascaris