Biological Classification — GK Questions with Answers

1. What is the smallest unit of classification?
   1. Kingdom
   2. Family
   3. Species
   4. Phylum
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   Answer: (C) Species

   Species is the smallest and most basic unit of classification.

2. Who proposed the five-kingdom system?
   1. Linnaeus
   2. Haeckel
   3. Copeland
   4. Whittaker
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   Answer: (D) Whittaker

   Whittaker proposed the five-kingdom system in 1969, the first to win wide acceptance.

3. What is a fungus’s cell wall made of?
   1. Cellulose
   2. Chitin
   3. Protein
   4. Lipid
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   Answer: (B) Chitin

   A fungus’s cell wall is built from chitin, while a plant’s is built from cellulose.

4. Mycorrhiza is a symbiotic relationship between what?
   1. Algae and fungus
   2. Fungus and plant roots
   3. Bacteria and plants
   4. Algae and bacteria
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   Answer: (B) Fungus and plant roots

   Mycorrhiza is the symbiotic relationship between a fungus and the roots of higher plants.

5. What is a gymnosperm’s defining feature?
   1. Producing flowers
   2. A naked seed
   3. Having no roots
   4. Being single-celled
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   Answer: (B) A naked seed

   A gymnosperm’s seeds are never wrapped in a fruit, which is why they are called naked-seeded plants.

6. What spreads malaria?
   1. Bacteria
   2. A virus
   3. A protozoan (Plasmodium)
   4. A fungus
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   Answer: (C) A protozoan (Plasmodium)

   Malaria spreads through Plasmodium, a protozoan carried into the body by a female Anopheles mosquito bite.

7. What does a virus need in order to stay alive?
   1. Only water
   2. A living host cell
   3. Sunlight
   4. Oxygen
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   Answer: (B) A living host cell

   Viruses are obligate parasites and cannot reproduce or grow without a living host cell.

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