MCQ Bank

Fungi decompose organic matter and recycle important nutrients such as carbon and nitrogen back into ecosystems. This process supports nutrient availability for plants and other organisms.

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Which of the following is not a common growth form of lichens?

A) Crustose
B) Foliose
C) Fruticose
D) Filamentous

AI Explanation

The common growth forms of lichens are crustose, foliose, and fruticose. Filamentous is not typically considered one of the major lichen growth forms.

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Q10

Which plant structures are most associated with fungal symbiosis?

A) Roots
B) Flowers
C) Leaves
D) Stems

AI Explanation

Fungal symbiosis, especially mycorrhiza, commonly occurs between fungi and plant roots. The fungi help plants obtain water and minerals while receiving carbohydrates from the plant.

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Q11

Which mode of reproduction is commonly seen in chytrids under favorable conditions?

A) Binary fission
B) Asexual reproduction via zoospores
C) Sexual reproduction with different gametes
D) Budding

AI Explanation

Chytrids commonly reproduce asexually by producing motile zoospores under favorable environmental conditions. These spores allow rapid dispersal and colonization.

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Q12

What is the term for a relationship where both fungi and animals benefit?

A) Parasitism
B) Mutualism
C) Predation
D) Commensalism

AI Explanation

Mutualism is a relationship in which both organisms benefit from the association. Many fungi form mutualistic relationships with animals by providing nutrients or other benefits.

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Q13

What is the mutualistic association of fungi and algae called?

A) Hyphae
B) Rhizoid
C) Lichen
D) Mycorrhiza

AI Explanation

A lichen is a mutualistic association between a fungus and a photosynthetic partner such as an alga or cyanobacterium. The fungus provides protection and structure while the photosynthetic partner provides nutrients.

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Q14

Which of the following is a typical substrate for Rhizopus growth?

A) Tree bark
B) Bread, fruits, and moist vegetables
C) Insects
D) Dry rocks

AI Explanation

Rhizopus is commonly found growing on moist, nutrient-rich organic materials such as bread, fruits, and vegetables. It acts as a decomposer of these substrates.

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Q15

What type of relationship does a parasitic fungus have with its host?

A) Mutualistic
B) Parasitic
C) Symbiotic
D) Commensal

AI Explanation

A parasitic fungus obtains nutrients from a host organism while causing harm to the host. Unlike mutualistic relationships, the benefit is mainly for the fungus and the host is negatively affected.

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Q16

How do parasitic fungi enter the human body most often?

A) Through digestion
B) Through wounds
C) Through inhalation
D) Through contact with infected animals

AI Explanation

Many human fungal infections begin when fungal spores are inhaled from the environment. These spores can enter the respiratory system and may cause disease, especially in susceptible individuals.

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Q17

Which animals often rely on fungi to digest plant material?

A) Amphibians
B) Grazing animals like cows and sheep
C) Predators
D) Birds of prey

AI Explanation

Grazing animals rely on fungi and other microorganisms in their digestive systems to help break down cellulose from plant material. This allows them to obtain nutrients from grasses and other vegetation.

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Q18

What is the percentage of fungal species known to be parasitic?

A) 10%
B) 90%
C) 30%
D) 50%

AI Explanation

Approximately 30% of known fungal species are considered parasitic. These fungi can infect plants, animals, and other organisms.

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Q19

Glomeromycota are grouped under which fungal phylum?

A) Chytridiomycota
B) Zygomycota
C) Glomeromycota
D) Ascomycota

AI Explanation

Glomeromycota is a fungal phylum that includes fungi forming arbuscular mycorrhizal associations with plant roots. They were historically grouped with other fungi but are now recognised as a distinct phylum.

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Q20

What role do fungi play in plant nutrition?

A) They release inorganic nutrients through decomposition
B) They feed on live roots
C) They cause nutrient deficiency
D) They absorb chlorophyll

AI Explanation

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.