Free Biodiversity and Variety of Life MCQs with Answers

2861. Dysentery is caused by:

• A. E. coli
• B. Salmonella
• C. Entamoeba histolytica
• D. Bacteroides fragilis
• E. Listeria monocytogenes

Explanation: This protozoan parasite is the correct answer. It is known to cause amoebic dysentery, a severe intestinal infection leading to diarrhea and abdominal pain.

2862. Which of the following is not a symptom of malaria?

• A. Headache
• B. Muscular pains
• C. Constipation
• D. Chills

Explanation: Constipation is not typically associated with malaria. Malaria symptoms mainly include fever, chills, headache, and muscle pain.

2863. Chlorella is fresh water:

• A. Bacterium
• B. Virus
• C. Fungus
• D. Alga

Explanation: Chlorella is a genus of freshwater green algae. It is a photosynthetic microorganism and belongs to the group of algae, specifically green algae, which are part of the Kingdom Protista.

2864. Which of the following is true about amoeba ?

• A. They move by forming specialized cytoplasmic projections called pseudopodia
• B. They have rigid cell wall
• C. They are multicellular organisms
• D. They are autotrophic

Explanation: Amoeba is a unicellular, heterotrophic organism without a rigid cell wall. It moves and captures food by extending pseudopodia (false feet).

2865. Which of the following statements is not true for slime molds in their feeding stage, known as a plasmodium?

• A. It ingests bacteria, yeasts, spores and decaying organic matter
• B. Form resistant haploid spores
• C. Undergoes meiosis
• D. Their zygote produces a single nucleated plasmodium

Explanation: Slime molds form diploid spores, not resistant haploid ones.

2866. Viruses are:

• A. Always viewed with a light microscope
• B. An enzyme-nucleus mixture
• C. Obligate, intracellular parasites
• D. Cellular
• E. Host independent

Explanation: Viruses are obligate, intracellular parasites, which means they require a host cell to reproduce and carry out their life cycle. They cannot replicate or metabolise independently outside of a host cell. Viruses, at their most basic level, are composed of genetic material (DNA or RNA) enclosed in a protein coat called capsid

2867. A student studied a drop of pond water with the low power of compound microscope and made the following exact drawing of an organism she observed, Which kingdom is the organism classified as?

• A. Protista
• B. Monera
• C. Metazoa
• D. Animalia
• E. Bryophyta

Explanation: Kingdom Protista has membrane-bound organelles, as shown in the diagram and a true nucleus. That is why option A is correct

2868. Which one of the following statements is incorrect?

• A. Algae increase the level of dissolved oxygen in the immediate environment
• B. Algin is obtained from red algae and carrageenan from brown algae
• C. Agar­-agar is obtained from Gelidium and Gracilaria
• D. Laminaria and Sargassum are used as food

Explanation: (b) : Alginic acid is obtained from brown algae whereas carrageenan is obtained from red algae.

2869. Which one of the following statements is incorrect?

• A. Chlorella and Spirulina are used as space food
• B. Mannitol is stored food in red algae
• C. Algin and carrageenan are products of algae
• D. Agar­agar is obtained from Gelidium and Gracilaria

Explanation: (b) : Laminarin and mannitol are food reserves of brown algae or Phaeophyceae. Rhodophycean algae store food in the form of floridean starch. This question is tough and is included in the QBank for the thorough preparation of students

2870. Which of the following is true about amoeba?

• A. They move by forming specialized cytoplasmic projections called pseudopodia
• B. They have a rigid cell wall
• C. They are multicellular organisms
• D. They are autotrophic

Explanation: This is the correct answer. Amoebas are single-celled organisms that move by extending and retracting temporary, finger-like projections of their cytoplasm called pseudopodia. These pseudopodia help them engulf food and navigate their environment.Therefore, the statement that is true about amoebas is that they move by forming specialised cytoplasmic projections called pseudopodia.