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

91. In which kingdom would you classify an organism that is unicellular and lacks a true nucleus?
    a) Protista
    b) Fungi
    c) Animalia
    d) Monera

Answer: d) Monera

Explanation:
Organisms in the kingdom Monera are unicellular and prokaryotic, meaning they lack a true nucleus.

92. Which of the following kingdoms includes organisms that are both autotrophic and heterotrophic?
    a) Animalia
    b) Protista
    c) Plantae
    d) Fungi

Answer: b) Protista

Explanation:
The kingdom Protista includes organisms that can be autotrophic (such as algae) or heterotrophic (such as protozoa).

93. Which of the following characteristics is unique to prokaryotes?
    a) Lack of cell wall
    b) Presence of a true nucleus
    c) Circular DNA without histones
    d) Multicellular forms

Answer: c) Circular DNA without histones

Explanation:
Prokaryotes have circular DNA that is not associated with histone proteins, unlike eukaryotes, which have linear DNA associated with histones.

94. Which of the following is the smallest and simplest taxonomic rank?
    a) Genus
    b) Species
    c) Family
    d) Order

Answer: b) Species

Explanation:
Species is the smallest and most specific taxonomic rank, representing a group of organisms that can interbreed and produce fertile offspring.

95. In which kingdom would you classify multicellular, heterotrophic organisms that lack cell walls?
    a) Plantae
    b) Protista
    c) Fungi
    d) Animalia

Answer: d) Animalia

Explanation:
Organisms in the kingdom Animalia are multicellular, heterotrophic, and lack cell walls, distinguishing them from plants and fungi.

96. Which of the following is NOT a characteristic of living organisms?
    a) Growth and development
    b) Reproduction
    c) Ability to respond to stimuli
    d) Ability to survive without energy

Answer: d) Ability to survive without energy

Explanation:
All living organisms require energy to survive and carry out biological processes. This is a fundamental characteristic of life.

97. In which of the following is the cell wall absent?
    a) Plant cells
    b) Bacterial cells
    c) Fungal cells
    d) Animal cells

Answer: d) Animal cells

Explanation:
Animal cells lack a cell wall, whereas plant, bacterial, and fungal cells possess cell walls.

98. Which taxonomic category ranks directly above the genus level?
    a) Species
    b) Family
    c) Class
    d) Order

Answer: b) Family

Explanation:
The taxonomic hierarchy places family above genus and below order.

99. The binomial name of an organism consists of:
    a) Genus and species
    b) Family and species
    c) Class and genus
    d) Order and species

Answer: a) Genus and species

Explanation:
In binomial nomenclature, an organism’s scientific name is composed of its genus and species, e.g., Homo sapiens.

100. Which of the following is a prokaryote?
     a) Algae
     b) Fungi
     c) Cyanobacteria
     d) Protozoa

Answer: c) Cyanobacteria

Explanation:
Cyanobacteria are prokaryotic organisms (commonly known as blue-green algae), meaning they lack a true nucleus and other membrane-bound organelles