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. Clavicle
- B. Keel of sternum
- C. Scapula
- D. Coracoid
Explanation: In birds, the pectoral and supracoracoideus muscles that power the wings are anchored to a large bony keel along the midline of the sternum.
Correct answer: Keel of sternum- A. Gills
- B. Spiracles
- C. Postanal tail
- D. Chitinous exoskeleton
Explanation: The diagnostic characters of chordates are notochord, dorsal hollow nerve cord, pharyngeal slits and a post anal tail.
Correct answer: Postanal tail- A. Oncosphere
- B. Cysticercus
- C. Morula
- D. Egg
Explanation: Eggs of Taenia undergo cleavage to form morula. Morula, at its morphologically posterior end, develops three pairs of chitinous hooks…
Correct answer: Oncosphere- A. Hydrozoa
- B. Scyphozoa
- C. Anthozoa
- D. None of these
Explanation: Jelly fish belongs to the Class Scyphozoa of the Phylum Cnidaria. Its genus is Aurelia.
Correct answer: Scyphozoa- A. Eel
- B. Carp
- C. Cat fish
- D. Gambusia
Explanation: The Gambusia is a species of freshwater fish. It is remarkably hardy, surviving in waters of very low oxygen saturations, high salinities…
Correct answer: Gambusia- A. Rodentia
- B. Chiroptera
- C. Primata
- D. Cetacea
Explanation: Order Cetacea includes whales, dolphins and porpoises. These are the most highly modified mammals.
Correct answer: Cetacea847. Bird vertebrae are:
- A. Acoelous
- B. Heterocoelous
- C. Amphicoelous
- D. Procoelous
Explanation: Bird vertebrae are heterocoelous, i.e. the centra of the vertebrae have saddle shaped ends.
Correct answer: Heterocoelous- A. Wading
- B. Perching
- C. Running
- D. Catching
Explanation: The hindlimbs (or hind legs) of kingfishers are modified for perching and gripping onto branches.
Correct answer: Perching- A. Salivary glands
- B. Adrenal gland
- C. Crop
- D. Gizzard
Explanation: Pigeons are noted for their unique ability to produce "pigeon's milk", a soft, cheesy and nourishing secretion, especially during the…
Correct answer: Crop- A. Amphiuma
- B. Bombina
- C. Necturus
- D. Salamandra
Explanation: The fire bellied toads are a group of eight species of small toads belonging to the genus Bombina.
Correct answer: Bombina- A. Salamander
- B. Toad
- C. Tortoise
- D. Frog
Explanation: Tortoise belongs to the Class Reptilia. Its body is protected by a shell consisting of a dorsal carapace and ventral plastron.
Correct answer: Tortoise- A. Chiton
- B. Teredo
- C. Limax
- D. Patella
Explanation: The common name of Teredo is shipworm which belongs to the class bivalvia of the Phylum Mollusca.
Correct answer: Teredo- A. Pupal stage
- B. Larval stage
- C. Nymph stage
- D. Adult stage
Explanation: The mulberry silk moth has been the most commercially important and beneficial insect.
Correct answer: Pupal stage- A. Only (4)
- B. (1) and (2)
- C. (3) and (4)
- D. Only (3)
Explanation: The frog's heart is myogenic, i.e. its heartbeat originates from muscles of heart. Hence, it is autorythmic.
Correct answer: (3) and (4)- A. Seminal vesicles
- B. Mushroom glands
- C. Testes
- D. Vas deferens
Explanation: Seminal vesicles are numerous small sacs present on ventral surface of anterior part of the ejaculatory duct which store sperms.
Correct answer: Seminal vesicles856. Smooth muscles are:
- A. Involuntary, fusiform and nonstriated
- B. Voluntary, multinucleate and cylindrical
- C. Involuntary, cylindrical and striated
- D. Voluntary, spindle-shaped and uninucleate
Explanation: Smooth muscle fibres are elongated and spindle shaped (fusiform). Each fibre contains a single oval nucleus surrounded by cytoplasm…
Correct answer: Involuntary, fusiform and nonstriated- A. Transitional epithelium - tip of the nose
- B. Cuboidal epithelium - Lining of the stomach
- C. Smooth muscle - Wall of intestine
- D. Areolar tissue - Tendons of the nose
Explanation: Tip of the nose has elastic cartilage. Simple columnar epithelium lines the stomach.
Correct answer: Smooth muscle - Wall of intestine- A. Urea
- B. Calcium carbonate
- C. Ammonia
- D. Potassium urate
Explanation: In cockroaches, Malpighian tubules extract metabolic wastes like potassium and sodium urate, water and carbon dioxide from the blood.
Correct answer: Potassium urate- A. An arthrodial membrane
- B. Cartilage
- C. Cementing glue
- D. Muscular tissue
Explanation: The arthrodial membrane is a tough, flexible cuticle that joins the skeletal elements of cockroach and other arthropods.
Correct answer: An arthrodial membrane- A. Tendon = Speciliazed connective tissue
- B. Adipose tissue = Dense connective tissue
- C. Areolar tissue = Loose connective tissue
- D. Cartilage = Loose connective tissue
Explanation: Areolar tissue is the most widely distributed loose connective tissue in the body.
Correct answer: Areolar tissue = Loose connective tissue