Free Biodiversity and Variety of Life MCQs with Answers

1321. Which of the following belongs to chordates?

• A. Spider
• B. Earthworm
• C. Trout Fish
• D. Star Fish

Explanation: Trout fish belong to the phylum Chordata, which is characterized by animals that possess a notochord at some stage of development, a dorsal nerve cord, pharyngeal slits, and a post-anal tail. Trout specifically belong to the class Actinopterygii (ray-finned fishes) and the order Salmoniformes. They are typically found in freshwater habitats like rivers and lakes and are known for their streamlined bodies and gills for respiration. Trout are popular among anglers and play a significant role in freshwater ecosystems as both predators and prey.

1322. Which one of the following is not an acoelomate?

• A. Aurelia
• B. Chaetopterus
• C. Euplectella
• D. Taenia

Explanation: Annelids are coelomates, meaning they have a true coelom, a fluid-filled body cavity lined by mesoderm tissue.Coelomates are animals that possess a coelom, which is a fluid-filled body cavity completely lined by mesoderm. This body structure allows for the development of complex organ systems and greater flexibility in movement and growth

1323. Malpighian tubules are found in:

• A. Earthworm
• B. Grasshopper
• C. Leech
• D. Slug

Explanation: A grasshopper is an Arthropod so it has Malphigian tubules.Malpighian tubules are the excretory and osmoregulatory organs found in insects, myriapods, arachnids, and tardigrades. They are finger-like projections that branch off from the gut and are analogous to kidneys in vertebrates

1324. Sharks belong to class:

• A. Chondrichthyes
• B. Osteichthyes
• C. Urochordata
• D. Coelenterata

Explanation: Chondrichthyes includes sharks, rays, and skates. They are primarily marine and have a wide range of adaptations for hunting and survival in diverse environments.Chondrichthyes is a class of fish characterized by a skeleton made of cartilage rather than bone.

1325. Canal system is a characteristic of:

• A. Cnidarians
• B. Protozoans
• C. Porifera
• D. Segmented worms

Explanation: The canal system in Porifera (sponges) is a unique and efficient water filtration system that facilitates feeding, respiration, and waste removal.

1326. Mantle is the feature of

• A. Annelids
• B. Arthropods
• C. Echinoderms
• D. Molluscs

Explanation: In molluscs, the mantle is a vital tissue layer that serves multiple essential functions. It lines the body cavity and, in shelled molluscs, secretes calcium carbonate to create and maintain the shell, providing the animal with protection and support. The mantle also encloses the mantle cavity, where respiration occurs; this cavity typically contains gills (or lungs in some species), enabling the mollusk to perform gas exchange efficiently. Additionally, the mantle cavity acts as an excretory route, allowing waste products to be expelled. In certain molluscs, such as cephalopods, the mantle has evolved to assist in movement and defense, showcasing its adaptability and importance to molluscan biology.

1327. Hemichordata belongs to:

• A. Deuterostomes
• B. Protostomes
• C. Both (a) and (b)
• D. None of the given options

Explanation: Hemichordates, such as acorn worms, are deuterostomes, meaning their embryonic development follows the pattern where the anus forms before the mouth, similar to chordates.

1328. Which of following is true about Triploblastic animals?

• A. Their body consists of two layers
• B. They have non-cellular mesoglea present
• C. They have a great degree of specialization in cells
• D. They have radial symmetry

Explanation: Triploblastic animals have three germ layers, allowing for organ specialization.

1329. Parazoa are:

• A. Multicellular
• B. Radially symmetrical
• C. Bilaterally symmetrical
• D. Asymmetrical

Explanation: Parazoa is a subkingdom of animals that includes sponges (phylum Porifera) and lacks specialized tissues and organs, unlike other animals. These organisms have a cellular level of organization, meaning their cells specialize but do not form true tissues or organs, a characteristic that has made them successful in various marine environments.

1330. _Completes the life cycle in two boats snail, sheep, or man

• A. Liver Fluke
• B. Snail
• C. Earthworm
• D. Tapeworm

Explanation: Liver Fluke - Correct. The liver fluke (Fasciola) has a complex life cycle involving snails and mammals (e.g., sheep or humans) as hosts.