NEET 2025 MCQ with Answer Explanation : “The Living World”.

40. Which of the following characteristics is NOT applicable to all living organisms?
    a) Reproduction
    b) Metabolism
    c) Response to stimuli
    d) Photosynthesis

Answer: d) Photosynthesis

Explanation:
Photosynthesis is a process specific to autotrophic organisms like plants and some bacteria. It is not a universal characteristic of all living organisms.

41. Which of the following is a characteristic feature of eukaryotic cells?
    a) Absence of membrane-bound organelles
    b) Circular DNA
    c) Presence of a well-defined nucleus
    d) Unicellular only

Answer: c) Presence of a well-defined nucleus

Explanation:
Eukaryotic cells are characterized by the presence of a true nucleus enclosed by a nuclear membrane, as well as membrane-bound organelles.

42. The correct sequence of taxonomic categories in descending order is:
    a) Phylum > Class > Order > Family > Genus > Species
    b) Class > Order > Phylum > Family > Genus > Species
    c) Kingdom > Phylum > Class > Genus > Family > Species
    d) Genus > Species > Family > Order > Class

Answer: a) Phylum > Class > Order > Family > Genus > Species

Explanation:
The correct order in taxonomy from broadest to most specific is: Phylum, Class, Order, Family, Genus, and Species.

43. Organisms that can survive only in the presence of oxygen are called:
    a) Anaerobes
    b) Aerobes
    c) Facultative anaerobes
    d) Microaerophiles

Answer: b) Aerobes

Explanation:
Aerobes are organisms that require oxygen for survival and metabolic processes. Anaerobes, in contrast, do not require oxygen.

44. In which of the following kingdoms would you classify an organism that is multicellular, eukaryotic, and autotrophic?
    a) Monera
    b) Fungi
    c) Plantae
    d) Protista

Answer: c) Plantae

Explanation:
Kingdom Plantae includes multicellular, eukaryotic, and autotrophic organisms that can produce their own food through photosynthesis.

45. Which one of the following kingdoms includes organisms that are both heterotrophic and have a cell wall?
    a) Plantae
    b) Protista
    c) Fungi
    d) Animalia

Answer: c) Fungi

Explanation:
Fungi are heterotrophic organisms that absorb nutrients from their environment. They have a cell wall made of chitin.

46. Which of the following organisms can be found in the kingdom Protista?
    a) Yeast
    b) Amoeba
    c) Mosses
    d) Earthworm

Answer: b) Amoeba

Explanation:
Amoeba is a unicellular eukaryote, classified under the kingdom Protista. It uses pseudopodia for movement and feeding.

47. Which of the following is an incorrect pair of kingdom and characteristic?
    a) Monera – Prokaryotic organisms
    b) Protista – Unicellular eukaryotic organisms
    c) Fungi – Heterotrophic organisms with cell walls made of chitin
    d) Plantae – Heterotrophic organisms

Answer: d) Plantae – Heterotrophic organisms

Explanation:
Kingdom Plantae consists of autotrophic organisms (they make their own food via photosynthesis), not heterotrophs.

48. Which of the following is an example of a colonial protist?
    a) Amoeba
    b) Paramecium
    c) Volvox
    d) Plasmodium

Answer: c) Volvox

Explanation:
Volvox is an example of a colonial protist, where many individual cells come together to form a spherical colony.

49. Which of the following organisms is incorrectly matched with its respective kingdom?
    a) Bacteria – Monera
    b) Amoeba – Protista
    c) Mushroom – Plantae
    d) Yeast – Fungi

Answer: c) Mushroom – Plantae

Explanation:
Mushrooms belong to the kingdom Fungi, not Plantae. They are heterotrophic and do not perform photosynthesis.

50. Which of the following is an example of a eukaryotic organism that is autotrophic?
    a) Paramecium
    b) Yeast
    c) Algae
    d) Amoeba

Answer: c) Algae

Explanation:
Algae are eukaryotic and autotrophic organisms capable of photosynthesis. They belong to the kingdom Protista.