Free Biodiversity and Variety of Life MCQs with Answers

1081. Coelom is a cavity lined by:

• A. Mesoderm
• B. Endoderm
• C. Epiderm
• D. Ectoderm

Explanation: Option A is correct as coelom is a fluid-filled cavity that is entirely lined by mesoderm. Options B, C, and D are incorrect as coelom is primarily lined by mesoderm only.

1082. Which one of the following does not have intermediate host?

• A. Tapeworm
• B. Ascaris
• C. Liver fluke
• D. Plasmodium

Explanation: Organisms that have an intermediate host spend their lifetimes in two different organisms.

1083. Which of the following is a freshwater sponge?

• A. Sycon
• B. Leucosolenia
• C. Euplectella
• D. Spongilla

Explanation: Spongilla is a genus of freshwater sponges in the family Spongillidae found in lakes and slow streams. Sycon is a genus of calcareous sponges belonging to the family Sycettidae. These sponges are small and are tube-shaped and often white to cream in color. Euplectella is a genus of glass sponges that includes the well-known Venus flower basket. So, the correct answer is option D.

1084. Pseudocoelom is actually derived from:

• A. Blastocoel
• B. Gastrocoel
• C. Neurocoel
• D. Haemocoel

Explanation: A pseudocoelom is a fluid-filled space between the body wall and the digestive tract found in roundworms. Pseudocoelom develops from the embryo's blastocoel rather than a secondary cavity within the embryonic mesoderm (which leads to a real body cavity or coelom).

1085. Species of Phylum Platyhelminthes are:

• A. Roundworms
• B. Flatworms
• C. Hook worms
• D. Threadworms
• E. Pinworms

Explanation: Phylum Platyhelminthes are called flatworms. (Fact)

1086. A characteristic feature of Echinoderm is:

• A. Canal system
• B. Water vascular system
• C. Tracheal system
• D. Blood vascular system
• E. None of these

Explanation: The characteristic of adult echinoderms is the possession of a water vascular system. There is no true heart and blood and no tracheal or canal system.

1087. Which vertebrate groups have scaly skin?

• A. Amphibians and fish
• B. Amphibians and mammals
• C. Fish and mammals
• D. Fish and reptiles

Explanation: Fish and reptiles have scaly skins, as shown below:

1088. Archaeopteryx is a transitional stage between the members of which one of the following pairs?

• A. Amphibian-Bird
• B. Fish-Amphibian
• C. Reptile-Mammal
• D. Reptile-Bird
• E. Mammal-Man

Explanation: It has long been accepted that Archaeopteryx was a transitional form between birds and reptiles and that it is the earliest known bird.

1089. Identify the phylum in which the larvae is bilaterally symmetrical but the adult Is radially symmetrical

• A. Ctenophora
• B. Coelenterata
• C. Echinodermata
• D. Sipunculoidea

Explanation: In Phylum Echinodermata, the adult echinoderms are radially symmetrical but the larvae are bilaterally symmetrical.

1090. The adaptive feature(s) which help(s) the fish to live in water include(s):

• A. A tail and an air bladder
• B. Unpaired and paired fins
• C. Streamlined body
• D. Gills and strong sense of smell
• E. All of these options

Explanation: All of the above options help fish thrive in their ecosystem. Tail, an air bladder, unpaired and paired fins, a streamlined body for movement, gills for breathing, and a strong sense of smell to find food.