MCQ Bank

Fungi contribute to plant nutrition by decomposing organic matter and releasing inorganic nutrients into the soil. These nutrients can then be absorbed by plants for growth and development.

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Q21

What is the algal component of lichen called?

A) Photobiont
B) Mycelium
C) Sporebiont
D) Sporangium

AI Explanation

The algal or photosynthetic component of a lichen is called the photobiont. It produces carbohydrates through photosynthesis, which are used by the fungal partner.

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Q22

What makes fungi effective decomposers in ecosystems?

A) They store nitrogen
B) They secrete enzymes to degrade lignin and cellulose
C) They are autotrophs
D) They photosynthesize

AI Explanation

Fungi are effective decomposers because they release enzymes that break down complex plant materials such as lignin and cellulose. This allows them to recycle nutrients in ecosystems.

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Q23

The hyphae of Rhizopus are described as:

A) Aseptate and multinucleated
B) Dikaryotic and septate
C) Monokaryotic and branched
D) Septate

AI Explanation

Rhizopus has coenocytic (aseptate) hyphae that contain many nuclei within a continuous cytoplasm. This is a characteristic feature of many zygomycete fungi.

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Q24

The vegetative reproduction in Rhizopus occurs by:

A) Spore formation
B) Budding
C) Conidia
D) Hyphal fragmentation

AI Explanation

Rhizopus can reproduce vegetatively through fragmentation of its hyphae. Each fragment can grow into a new fungal colony under suitable conditions.

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Q25

Zygomycetes usually reproduce sexually by forming:

A) Zygospores
B) Ascospores
C) Zoospores
D) Basidiospores

AI Explanation

Zygomycetes typically reproduce sexually by forming zygospores. These are thick-walled, resistant structures produced after the fusion of compatible hyphae.

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Q26

Which chemical from fungi is used to lower cholesterol levels?

A) Erythromycin
B) Cyclosporin
C) Statin
D) Cephalosporin

AI Explanation

Statins used for lowering cholesterol levels were originally discovered from fungal metabolites. They inhibit cholesterol synthesis by blocking the enzyme HMG-CoA reductase.

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Q27

What is the most unique feature of chytrid fungi among fungal phyla?

A) Production of antibiotics
B) Presence of hyphae
C) Production of basidiospores
D) Flagellated zoospores

AI Explanation

Chytrid fungi are unique among fungal groups because they produce motile, flagellated zoospores. This feature reflects their aquatic or moist habitat adaptations.

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Q28

Which fungal genus is commonly associated with allergic reactions in humans?

A) Aspergillus
B) Rhizopus
C) Trichoderma
D) Penicillium

AI Explanation

Aspergillus is a fungal genus commonly associated with allergic reactions and respiratory problems in humans. Its spores can trigger allergic responses when inhaled.

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Q29

The reproductive structure that houses zygospores is called:

A) Ascocarp
B) Basidium
C) Conidiophore
D) Zygosporangium

AI Explanation

A zygosporangium is the reproductive structure that contains and protects zygospores. It develops during sexual reproduction in zygomycete fungi.

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Q30

What do plants receive from fungi in mycorrhizal associations?

A) Sugars
B) Water and minerals
C) CO₂
D) Organic acids

AI Explanation

In mycorrhizal associations, fungi improve the plant's ability to absorb water and minerals from the soil. In return, plants provide carbohydrates to the fungi.

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Q31

Chytrids store their carbohydrates in the form of:

A) Lipids
B) Starch
C) Glycogen
D) Glucose

AI Explanation

Chytrids, like many fungi, store carbohydrates mainly in the form of glycogen. This storage compound serves as an energy reserve.

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Q32

Which of the following is an antibiotic derived from fungi?

A) Penicillin
B) Morphine
C) Insulin
D) Estrogen

AI Explanation

Penicillin is an antibiotic originally derived from the fungus Penicillium. It is widely used to treat bacterial infections by inhibiting bacterial cell wall formation.

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Q33

What is the main structural component of the chytrid fungal cell wall?

A) Peptidoglycan
B) Glycogen
C) Chitin
D) Cellulose

AI Explanation

The cell walls of chytrid fungi contain chitin, a structural polysaccharide common in fungal cell walls. Chitin provides strength and protection to fungal cells.

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Q34

Mushrooms belong to which phylum of fungi?

A) Ascomycota
B) Deuteromycota
C) Zygomycota
D) Basidiomycota

AI Explanation

Mushrooms are members of the phylum Basidiomycota. They produce sexual spores called basidiospores on specialized structures known as basidia.

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Q35

What type of hyphae are involved in mushroom mycelium?

A) Monokaryotic
B) Dikaryotic
C) Septate
D) Aseptate

AI Explanation

Mushroom mycelium commonly consists of dikaryotic hyphae, which contain two genetically distinct nuclei per cell. This stage is important in the life cycle of many Basidiomycota fungi.

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Q36

In mutualism, both organisms:

A) One benefits, one is harmed
B) Benefit from the interaction
C) Are harmed
D) Compete for nutrients

AI Explanation

Mutualism is a relationship in which both organisms gain benefits from their interaction. Neither organism is harmed in this type of association.

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Q37

The primary reproductive strategy of mushrooms is:

A) Budding
B) Fission
C) Sexual reproduction
D) Fragmentation

AI Explanation

Mushrooms primarily reproduce sexually by producing basidiospores. These spores are formed on specialized structures called basidia.

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Q38

Which of the following is a typical example of a zygomycete fungus?

A) Penicillium chrysogenum
B) Agaricus bisporus
C) Saccharomyces cerevisiae
D) Rhizopus stolonifer

AI Explanation

Rhizopus stolonifer, commonly known as black bread mold, is a typical example of a zygomycete fungus. It reproduces sexually by forming zygospores.

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Q39

Glomeromycota form a symbiotic relationship with the roots of approximately:

A) 25% of land plants
B) 100% of land plants
C) 80% of land plants
D) 50% of land plants

AI Explanation

Glomeromycota form arbuscular mycorrhizal associations with approximately 80% of terrestrial plant species. These fungi help plants absorb nutrients and water from soil.