Free Biodiversity and Variety of Life MCQs with Answers

3121. Termites cut wood with the help of enzyme produced by

• A. Trichonella
• B. Tripanosoma
• C. Trichonympha
• D. Trichina

Explanation: Although termites are insects that eat wood, they are not capable of digesting wood on their own. Endosymbionts that live within the intestines of the termite assist in converting the wood into nutrients that the termite can digest. One of the several types of endosymbionts that live inside the termite is single-celled organisms called Trichonympha (protozoa). Trichonympha has the enzymes needed to convert cellulose in wood into starches and sugars that the termite can use as nutrients.

3122. A protist that forms sea-weeds is:

• A. Red algae
• B. Brown algae
• C. Green algae
• D. Diatoms

Explanation: The brown algae comprise the class Phaeophyceae, golden-brown algae that range from small filamentous forms to large, complex seaweeds. These organisms are important as food and as habitat for many aquatic animals. Kelps (large brown seaweeds), for example, create a kelp forest that serves as a habitat for small marine animals.

3123. Best known "Apicomplex" is the:

• A. Obligate parasites
• B. Facultative parasite
• C. Malarial parasites
• D. Pathogenic parasites

Explanation: Apicomplexan, also called sporozoan, are protozoan of the (typically) spore-producing phylum Apicomplexa. All apicomplexans are parasitic and lack contractile vacuoles and locomotor processes.Malaria is caused by a single-celled parasite of the genus Plasmodium. The malarial parasite, plasmodium, is the best-known apicomplexa. All Plasmodium species share a similar life cycle. It has two parts-in the first, the parasite infects a person (or a vertebrate host), and in the second, it is transmitted from the malaria patient (or infected vertebrate host) to another host by an insect vector.

3124. Kelps are:

• A. Diatoms
• B. Red-algae
• C. Green-algae
• D. Brown-algae

Explanation: Kelps are brown algae, known for their large size and complex structure, often forming dense underwater forests in cold oceanic regions. These forests provide critical habitat and resources for marine organisms. In contrast, diatoms are small, silica-walled algae, red algae are smaller and have a distinct red pigment, and green algae do not reach the size or complexity of kelps.

3125. Which of the locomotor organ would likely be the shortest?

• A. A flagellum
• B. A cillium
• C. An extended pseudopod
• D. A pellicle

Explanation: Pellicle is a thick cuticle and it is not a locomotor organ so option D is incorrect. Whereas pseudopods are cytoplasmic extensions. Among ciliium and flagellum, option B is correct since cilium is shorter in comparison.

3126. Poisonous red-tides in coastal area are caused by the blooms

• A. Euglenoids
• B. Rhodophyta
• C. Diatoms
• D. Dinoflagellates

Explanation: Poisonous red tides are caused by algae so the correct option is D i.e Dinoflagellates

3127. Acetabularia mediterranea is:

• A. A fungus
• B. An algae
• C. A protozoan
• D. A prokaryote

Explanation: Students should learn that Acetabularia Mediterranea is a green algae

3128. Most conspicuous sea-weeds are:

• A. Red-algae
• B. Blue-algae
• C. Green-algae
• D. Brown-algae

Explanation: Students should learn that most conspicuous sea-weeds are brown algae

3129. An outer flexible covering of cilicates is:

• A. Pelicle
• B. Cell wall
• C. Sheath
• D. Cuticle

Explanation: The pellicle is the outer flexible covering found in ciliates, which are a type of microorganism. It acts as a protective layer and helps maintain the shape of the organism.

3130. The characteristics displayed by protozoa are most closely similar to the characteristics of:

• A. Plants
• B. Bacteria
• C. Animal
• D. Viruses

Explanation: Protozoa actually have characteristics that are more closely similar to animals rather than plants. While plants are multicellular, have cell walls, and undergo photosynthesis, protozoa are single-celled organisms that lack cell walls and obtain their energy by consuming other organisms. They exhibit animal-like behaviors such as locomotion and feeding.