NEET 2025 MCQ with Answer Explanation : “Biological Classification”.

Here below some basic MCQ’s about “Biological Classification” with answer which is explained in details. Let’s check one by one which is given below.

1. Which of the following is not a characteristic feature of the kingdom Monera?
   a) They are prokaryotic
   b) They possess 70S ribosomes
   c) They lack a nuclear membrane
   d) They possess a well-defined nucleus

Answer: d) They possess a well-defined nucleus

Explanation: Monera includes prokaryotic organisms, such as bacteria, which lack a true nucleus. Their genetic material is not enclosed within a membrane, meaning they do not have a well-defined nucleus.

2. Which of the following is true about Archaebacteria?
   a) They are found in extreme environments
   b) They lack peptidoglycan in their cell walls
   c) They are similar to eubacteria in terms of ribosomal RNA
   d) They can perform photosynthesis using chlorophyll a

Answer: a) They are found in extreme environments

Explanation: Archaebacteria are extremophiles, meaning they live in extreme conditions such as high temperature, salinity, and acidic environments. Their cell walls lack peptidoglycan, differentiating them from eubacteria.

3. In which of the following groups would you place a unicellular, eukaryotic organism that is photosynthetic and motile?
   a) Protista
   b) Plantae
   c) Fungi
   d) Monera

Answer: a) Protista

Explanation: Protists are unicellular eukaryotes that can be autotrophic (photosynthetic) or heterotrophic. They often have features such as flagella or cilia for motility, and many are capable of photosynthesis.

4. Which of the following organisms belong to the kingdom Fungi?
   a) Algae
   b) Protozoa
   c) Yeasts
   d) Mosses

Answer: c) Yeasts

Explanation: Yeasts are unicellular fungi. Fungi are characterized by the presence of chitin in their cell walls, and they obtain nutrition through absorption. Yeasts reproduce both sexually and asexually.

5. Lichens are an association between:
   a) A bacterium and an alga
   b) A fungus and a moss
   c) An alga and a fungus
   d) A protozoan and a bacterium

Answer: c) An alga and a fungus

Explanation: Lichens are symbiotic associations between a fungus and a photosynthetic partner, usually an alga or cyanobacterium. The alga provides nutrients through photosynthesis, while the fungus offers protection and absorbs moisture and nutrients from the environment.

6. Which of the following statements is true about the kingdom Plantae?
   a) They are autotrophic and heterotrophic
   b) Their cell walls are made of chitin
   c) They reproduce asexually only
   d) They are primarily autotrophic

Answer: d) They are primarily autotrophic

Explanation: Organisms in the kingdom Plantae are primarily autotrophic, meaning they synthesize their food through photosynthesis. Their cell walls are made of cellulose, not chitin.

7. Which of the following pairs is correctly matched?
   a) Eubacteria – Methanogens
   b) Archaebacteria – Blue-green algae
   c) Fungi – Paramecium
   d) Protista – Amoeba

Answer: d) Protista – Amoeba

Explanation: Amoeba is a protozoan and belongs to the kingdom Protista. Methanogens are part of Archaebacteria, and blue-green algae (cyanobacteria) belong to Monera.

8. Which of the following has an acellular organization?
   a) Viruses
   b) Fungi
   c) Bacteria
   d) Protista

Answer: a) Viruses

Explanation: Viruses are acellular entities, meaning they are not made up of cells. They consist of genetic material (DNA or RNA) enclosed within a protein coat and are only active inside host cells.

9. Which group of organisms belongs to the kingdom Animalia?
   a) Sponges
   b) Algae
   c) Mushrooms
   d) Cyanobacteria

Answer: a) Sponges

Explanation: Sponges are simple multicellular organisms that belong to the kingdom Animalia. They are characterized by a lack of true tissues and organs but are still considered animals due to their heterotrophic mode of nutrition and multicellularity.

10. Which of the following does not belong to the kingdom Protista?
    a) Paramecium
    b) Spirogyra
    c) Euglena
    d) Penicillium

Answer: d) Penicillium
Explanation: Penicillium is a genus of fungi and does not belong to the kingdom Protista. Paramecium, Spirogyra, and Euglena are protists.