Free Biodiversity and Variety of Life MCQs with Answers

1201. All the animals of grade radiata are which of the following?

• A. Unicellular
• B. Triploblastic
• C. Both Options A and B are correct
• D. Diploblastic

Explanation: d) Diploblastic, The correct answer is "d) Diploblastic." Animals of the grade Radiata are diploblastic, which means they have two primary germ layers during embryonic development: the ectoderm and the endoderm. These two layers give rise to various tissues and structures in the adult organism. The Radiata grade includes phyla such as Cnidaria (e.g., jellyfish, corals) and Ctenophora (comb jellies), which are characterized by their diploblastic body organization.

1202. A free-living example of Platyhelminthes is?

• A. Dugesia
• B. Fasciola
• C. Taenia
• D. All of these options are correct

Explanation: a) Dugesia, This option is correct. Dugesia, also known as the planarian or freshwater flatworm, is a free-living example of Platyhelminthes. Planarians are found in freshwater habitats and are well-known for their ability to regenerate lost body parts.

1203. The skeleton of sponges is in the form of various needle like structures called?

• A. Stipules
• B. Brails
• C. Spines
• D. Spicules

Explanation: Spicules are the structural components of a sponge, or the "bricks," and the shapes, sizes, and composition are unique for each species. Together, you can look at these features under a microscope to make a positive identification. Spicules are composed of either Calcium or Silica.

1204. A sponge of Antarctica that is more than a meter tall is known as?

• A. Euplectella
• B. Spongilla
• C. Leucosolenia
• D. Scolymastra joubini

Explanation: d) Scolymastra joubini, Scolymastra joubini, also known as "giant Antarctic sponge," is a species of sponge found in the waters around Antarctica. It is indeed more than a meter tall and can grow to several meters in height.

1205. Which of the following organisms has an eel-like body?

• A. Chondrichthyes
• B. Osteichthyes
• C. Cyclostomata
• D. Both Options A and B are correct

Explanation: Due to their circular mouth, they are named Cyclostomata. They are parasitic, usually feeding on fish in their adult stage. Morphologically, they resemble eels. They are known to be the only living vertebrates without true jaws,

1206. The function of coelom is best characterized as?

• A. To increase the size of the animals
• B. To help in the functioning of the reproductive system
• C. To provide space for the development of organs and systems
• D. None of these

Explanation: The coelom provides a space where internal organs can develop and function. For example, the pumping action of the heart is possible because of the surrounding space the coelom provides. The fluid-filled coelom also protects internal organs by cushioning them.

1207. Which of the following is an amniote?

• A. Leaf green tree frog
• B. Japanese giant salamander
• C. Crow
• D. Both A and B

Explanation: Leaf green tree frog is Amphibian therefore its not an amniote .

1208. The animals which belong to the division Radiata are?

• A. Triploblastic
• B. Diploblastic
• C. Radioblast
• D. All of these options are correct

Explanation: Grade Radiata includes animals with radial symmetry, such as coelenterates, which are diploblastic.

1209. Which of the following are known as the internal buds?

• A. Spicules
• B. Choanocytes
• C. Gemmules
• D. Both options A and B are correct

Explanation: OPTION A: All sponges except class mykospongida have skeletons. The skeleton consists of carbonate of lime or silicon in the form of spicules or of spongin(a fibrous protein) in the form of fibers. OPTION B: Choanocytes are the cells that line the spongocoel and canals of poriferans. OPTION C: Gemmules are internal buds found in sponges and are involved in asexual reproduction. Hence, C is the correct option. OPTION D: It is an incorrect option.

1210. Removal of a parasite from the body of the host is called:

• A. Sterilization
• B. Disinfection
• C. Disinfestation
• D. None of these

Explanation: Disinfestation is the process of removing parasites from the bodies of the living hosts. Hence this is the correct option.