Free Biodiversity and Variety of Life MCQs with Answers

2721. Which of the following is not a characteristic feature of tapeworm?

• A. Each body segment has two sets of male and female reproductive organs
• B. The digestive tract develops from endodermal cells in the embryo
• C. The body can be cut into two parts, which are mirror images of each other, in one plane only
• D. None of the above

Explanation: B is correct option because Tapeworms absorb food through their skin. The beef tapeworm is called Taenia saginata. This tapeworm grows in the intestines of humans to a length of 30-40 feet. Ingesting undercooked beef increases the risk of getting this parasite in one's system. However, beef that is cooked properly may still have these parasites in it, but in a dead form.

2722. The animals in which coelom is formed due to splitting of mesoderm are known as which of the following?

• A. Pseudocoelom
• B. Enterocoelous
• C. Amphicoelous
• D. Schizocoelous

Explanation: Option D is correct since mesoderm splits in protostomes (annelid, arthropod, and mollusk) which are also called schizocoelous.

2723. These give rise to nematocysts in Cnidaria.

• A. Cnidocytes
• B. Gastrozoids
• C. Hydrozoa
• D. Mesoglea

Explanation: Option A is correct since Cnidocytes are the stinging cells that have nematocysts in them and poke them out on being stimulated.

2724. Sperms released in water are carried to the mesenchyme in sponges by

• A. Stipules
• B. Spicules
• C. Spines
• D. Amoeboid cells

Explanation: Option D is correct since amoeboid cells allow sexual reproduction to occur.Option A is incorrect since stipules are not found in sponges.Option B is incorrect since spicules support the structure of sponges.Option C is incorrect since sponges have little spines-like structures called spicules that are again responsible for forming sponges.

2725. The organs of locomotion in annelids are which of the following?

• A. Muscles and Bones
• B. Hydrostatic skeleton and intestinal fluid
• C. Parapodia and Setea
• D. None of the above.

Explanation: Annelid setae are stiff bristles present on the body. They help, for example, earthworms to attach to the surface and prevent backsliding during peristaltic motion. These hairs make it difficult to pull a worm straight from the ground.Annelid Parapodia are paired, unjointed lateral outgrowths that bear the chaetae.

2726. 80% of the food of sponges consists of which of the following?

• A. Detrital organic particles
• B. Zooplankton and Small animals
• C. Phytoplanktons
• D. All of these

Explanation: According to research, up to 80% of the food of sponges consists of detrital organic particles, which are tiny pieces of dead or decaying organic material, including dead plankton, fecal matter, and other debris.

2727. The organs of locomotion in 'annelids' are which of the following?

• A. Muscles
• B. Hydrostatic skeleton
• C. Parapodia
• D. Setae

Explanation: All annelids except leeches also have chitonous hair-like structures, called setae, projecting from their cuticle. Sometimes the setae are located on paddle-like appendages called parapodia. This helps in their locomotion.

2728. Vertebrates belong to phylum chordata because -----------

• A. They have a vertebral column
• B. Their brain is enclosed by the skull
• C. The embryos have gills
• D. The body develops from 3 germinal layers

Explanation: The vertebrates have a vertebral column, something like the notochord. Vertebrates show all the characteristic features of the phylum Chordata, such as the notochord, dorsal nerve cord, pharyngeal slits and post-anal tail.

2729. Centipedes belong to class _ of arthropoda.

• A. Arachnida
• B. Insecta
• C. Cephalopoda
• D. Myriapoda

Explanation: Correct option:D (It is a fact that Centipedes belong to the class Myriapoda of arthropoda). Centipedes belong to the class Myriapoda. Myriapods are a group of arthropods that also include millipedes. The word "Myriapoda" refers to the many-legged nature of these organisms.

2730. A hydrostatic skeleton is present in:

• A. Arthropods
• B. Fish
• C. Annelids
• D. Nematods

Explanation: Annelids have a hydrostatic skeleton in their body structure.