Free Biodiversity and Variety of Life MCQs with Answers

1361. A feature shared by all animals:

• A. Motile
• B. Aquatic lifestyle
• C. Locomotion by limbs
• D. Heterotrophy

Explanation: All animals are heterotrophs, which means they rely on consuming other organisms for nutrition. This is a fundamental trait that distinguishes them from autotrophs, like plants, which can produce their own food through photosynthesis. The other options are not universal among animals: some animals, such as sponges, are sessile and not motile; animals inhabit both aquatic and terrestrial environments, so an aquatic lifestyle is not a shared trait; and not all animals have limbs, as many invertebrates move in other ways.

1362. Pseudocoelom develops from:

• A. Blastostyle
• B. Blastocoel
• C. Blastocyst
• D. Mesoderm

Explanation: The body cavity that is formed from Blastocoel (cavity that is formed at blastula stage of developing embryo) is called pseudocoelom.

1363. Everything is true about coelom except:

• A. Found between body wall and gut
• B. Fluid filled
• C. Lined by mesoderm
• D. Bound internally by cuticle of intestine

Explanation: Coelom is internally lined by visceral layer of mesoderm. In pseudocoelomates body cavity is internally bound by cuticle of intestine.

1364. Acoelomates do not lack:

• A. Coelom
• B. Mesoderm
• C. Special transport system
• D. Coelomic fluid

Explanation: Acoelomates are triploblastic animals in which all the three germinal layers ectoderm. mesoderm and endoderm are present.

1365. _is a human parasite commonly known as pinworm.

• A. Fasciola hepatica
• B. Taenia solium
• C. Enterobius vermicularis
• D. Aurelia aurita

Explanation: Enterobius vermicularis commonly known as pinworm is cosmopolitan but more common in Europe and America. Pinworms are parasites in the human caecum, colon, and appendix.

1366. The internal opening of nephridia is called:

• A. Nephridiopore
• B. Nephrostome
• C. Metanephridia
• D. Nephropore

Explanation: Nephronstome is the internal opening of nephridia, serving as the entry point for waste and fluids to enter the excretory system.

1367. Scavenger insects may eat:

• A. Dead matter present in an organism
• B. Dead animals and plants
• C. Dead plant matter only
• D. Living animals only

Explanation: Scavengers are those animals that feed on dead animals and plants e.g. Drosophila and Vulture.

1368. Members of this phylum are exclusively marine:

• A. Porifera
• B. Cnidaria
• C. Mollusca
• D. Echinodermata

Explanation: The echinoderms are exclusively marine.There are over 5,000 known species of echinoderms. They are marine organisms living at the sea bottom.

1369. Water enters the water vascular system through:

• A. Radial canal
• B. Ampulla
• C. Ostla
• D. Madreporite

Explanation: The madreporite is a sieve-like, porous plate found on the aboral surface (the side opposite the mouth) of echinoderms such as starfish.It acts as the entry point for water into the water vascular system.Water enters through the madreporite and then circulates through a series of canals (stone canal → ring canal → radial canals → tube feet).

1370. _is a common parasite of the intestine of humans and pigs, which belongs to phylum nematode.

• A. Taenia solium
• B. Ascaris lumbricoides
• C. Schistosoma
• D. Fasciola hepatica

Explanation: Ascaris worms inhabit the lumen of the small intestine of human and pig.