Free Biodiversity and Variety of Life MCQs with Answers

1311. Round worms belong to which phylum?

• A. Annelida
• B. Coelenterata
• C. Nematoda
• D. Platyhelminthes

Explanation: Roundworms belong to the phylum Nematoda. Roundworms, also known as nematodes, are unsegmented, cylindrical worms that can be found in a wide range of habitats. They are one of the most abundant diverse animal groups on Earth.

1312. Silver fish is a/an?

• A. Insect
• B. Mollusc
• C. Jawless fish
• D. Cartilaginous fish

Explanation: Silverfish is an insect. It is a small, wingless insect with a silver-gray color and a distinctive fish-like shape.

1313. Tissue are not found in the following animal?

• A. Flat worms
• B. Sponges
• C. Cnidarians
• D. Round worms

Explanation: Sponges, also known as Porifera, are the simplest multicellular animals. They lack true tissues and organ systems. Instead, they are made up of specialized cells that perform specific functions but donot form tissues.

1314. The group of animals having a single celled body which performs all the vital activities of life are called:

• A. Protozoa
• B. Parazoa
• C. Metazoa
• D. Nanozoa

Explanation: Protozoa are unicellular, heterotrophic, eukaryotic organisms comprising four organisation types: amebae, flagellates, ciliates, and parasitic sporozoans. They are either free-living or parasites.Diagram:

1315. The word "annelida" is of greek origin; "annellus" means:

• A. Little ring
• B. Segmented body
• C. Thread
• D. Hollow

Explanation: Annelid, phylum name Annelida, also called a segmented worm, is a member of a phylum of invertebrate animals that are characterised by the possession of a body cavity (or coelom), movable bristles (or setae), and a body divided into segments by transverse rings, or annulations, from which they take their name. The name of the phylum is derived from the Latin word annellus, which means a little ring.

1316. The animal which is not having soft body?

• A. Hirudo
• B. Unio
• C. Sepia
• D. Loligo

Explanation: Hirudo is a genus of segmented worms commonly known as leeches. Leeches are not soft-bodied animals, as they have a cylindrical, elongated body that is divided into segments. The body of a leech is covered in a tough, muscular outer layer called the cuticle, which provides protection and support. So, option A is the only correct answer.

1317. Which size of sponge can filter an entire residential pool in one day?

• A. Tennis ball-sized
• B. Ladle-sized
• C. Basketball-sized
• D. Hockey ball-sized
• E. Teaspoon-sized

Explanation: The correct answer is Option C: Basketball-sized. This size of sponge provides the necessary surface area and volume to handle the filtration of a large body of water, such as a residential pool, in a single day. Smaller sponges, like those the size of a tennis ball, ladle, hockey ball, or teaspoon, do not have sufficient capacity to filter such a large volume effectively within 24 hours.

1318. The locomotion in segmented worms is brought about by:

• A. True Pods
• B. Pseudopodia
• C. Setae
• D. Peritrichous flagella

Explanation: Locomotion in segmented worms, such as earthworms, occurs through a combination of muscular contractions and the movement of their bristle-like structures called setae. These worms have circular and longitudinal muscles that work together to elongate and shorten the body.

1319. Animals that have a ladder-type nervous system, consisting of two nerve cords and connecting nerves that look like a ladder, belong to the phylum:

• A. Protozoa
• B. Coelenterata
• C. Cnidarian
• D. Porifera
• E. Platyhelminthes

Explanation: The ladder-like nervous system in flatworms features a centralized cerebral ganglion (brain) at the front, with two longitudinal nerve cords running along the body. Transverse nerves connect these cords, allowing for coordinated movement and responses to stimuli.

1320. Which soft-bodied animal is usually Ambisexual?

• A. Tapeworm
• B. Earthworm
• C. Jellyfish
• D. Snail
• E. Oyster

Explanation: Oysters are often considered ambisexual due to their ability to change sex during their lifecycle, starting as males and becoming females, depending on environmental conditions.