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. (A) and (B)
- B. (A), (B) and (C)
- C. (B) and (D)
- D. (C) and (D).
Explanation: Silver fish is an insect in which respiration occurs by tracheae. These communicate with the exterior by paired apertures, called…
Correct answer: (A), (B) and (C)- A. Sponge
- B. Earthworm
- C. Cockroach
- D. Hydra
Explanation: Hydra belongs to the phylum coelenterata and has nerve cells but no brain. Its nervous system consists of nerve cells and their processes.
Correct answer: Hydra- A. All chordates
- B. Some chordates
- C. Vertebrates
- D. Non chordates
Explanation: •Chordates are the animals that have a notochord, a skeletal rod, present at some stage in the life cycle.
Correct answer: All chordates- A. Annelida
- B. Echinodermata
- C. Insecta
- D. Mollusca
Explanation: In molluscs, blood often has a copper containing, blue, respiratory pigment called haemocyanin.
Correct answer: Mollusca- A. Earthworm
- B. Lower invertebrates
- C. Scorpion
- D. Snake
Explanation: Snakes are limbless reptiles with an elongated cylindrical body that is covered with overlapping scales differentiated into shields and…
Correct answer: Snake- A. Mouth and mouth
- B. Body wall and body wall
- C. Mouth and body wall
- D. Mouth and tentacles
Explanation: In Hydra, indigestible residues are egested through the mouth as there is no anus.
Correct answer: Mouth and body wall- A. holoblastic equal
- B. holoblastic unequal
- C. superficial
- D. discoidal
Explanation: Cleavage in mammals is holoblastic unequal. Mammals have microlecithal eggs so they have holoblastic cleavage in which the segmentation…
Correct answer: holoblastic unequal- A. Sexual dimorphism
- B. Metamerism .
- C. Anaerobic respiration
- D. Endoparasitism
Explanation: Sexual dimorphism refers to the difference in individuals of different sexes of the same species.
Correct answer: Sexual dimorphism- A. Will become flexible
- B. Will turn black
- C. Will break into pieces
- D. Will shrink
Explanation: Main component of bone is collagen which is a complex combination of amino acids.
Correct answer: Will become flexible- A. Platypus is oviparous.
- B. Bats have feathers
- C. Elephants are ovoviviparous
- D. Diaphragm is absent
Explanation: Mammals are viviparous i.e., they give birth to young ones. Protherians (e.g., Platypus) are primitive mammals that lay eggs, so they are…
Correct answer: Platypus is oviparous.- A. Ureotelic
- B. Ureotelic in water
- C. Ammonotelic
- D. Ureotelic over land
Explanation: The waste material of aquatic reptiles chiefly consists of urea, so they are ureotelic.
Correct answer: Ureotelic in water- A. Poikilothermic
- B. Homeothermic
- C. Aquatic
- D. Desert living
Explanation: Poikilothermic animals are those whose body temperature varies with the temperature of the environment.
Correct answer: Poikilothermic- A. Pelvic girdle
- B. Pectoral girdle
- C. Hindlimb
- D. Forelimb
Explanation: Forelimbs are absent in birds as they are modified into wings for flight.
Correct answer: Forelimb- A. Reptilia
- B. Land vertebrates
- C. Aves
- D. Mammals
Explanation: Aves are flying animals with less body weight. Their bones are hollow and connected by air passages.
Correct answer: Aves- A. Echinodermates
- B. Platyhelminthes
- C. Annelids
- D. Molluscs
Explanation: Solenocytes are also called flame cells. They are cup shaped cells, which contain groups of cilia.
Correct answer: Platyhelminthes- A. Dentary
- B. Maxilla
- C. Angulars
- D. Mandible
Explanation: Dentary is a membrane bone, present in the lower jaw of the vertebrates, that supports the teeth.
Correct answer: Dentary- A. Epithelial cells
- B. Spermatocytes
- C. Leydig's cell
- D. Sertoli cells
Explanation: The connective tissue in between the seminiferous tubules of the testis contains special interstitial cells or cells of Leydig.
Correct answer: Leydig's cell- A. Jointed legs
- B. Metamorphosis
- C. Compound eyes
- D. Poison glands
Explanation: Silver fish, scorpion, crab and honey bee all have compound eyes. These are present on each lateral side of the head and are convex.
Correct answer: Compound eyes- A. An egg with blastula
- B. An egg with a juvenile
- C. An egg with an egg
- D. An egg with gastrula
Explanation: The embryonated egg of Ascaris represents an egg with a juvenile. In case of Ascaris, the eggs containing the second stage of juvenile are…
Correct answer: An egg with a juvenile- A. They all have calcareous spicules
- B. They have high regenerative power
- C. They are found only in marine water
- D. They are all radially symmetrical
Explanation: Sponges may have calcareous or siliceous spicules. All sponges are not marine, some are freshwater living.
Correct answer: They have high regenerative power