MCQ Bank

Mycorrhiza is a mutualistic association between fungi and plant roots where both organisms benefit. The fungus helps plants absorb water and minerals, while the plant provides carbohydrates to the fungus.

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What is the primary role of fungi in ecosystems?

A) Parasite on humans
B) Predator of bacteria
C) Decomposer and nutrient recycler
D) Pathogen for plants

AI Explanation

Fungi play a major ecological role by breaking down dead organic matter and recycling nutrients back into ecosystems. This process helps maintain soil fertility and ecosystem balance.

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In lichens, what is the fungal component called?

A) Phycobiont
B) Chlorobiont
C) Mycobiont
D) Prothallus

AI Explanation

In lichens, the fungal partner is called the mycobiont, while the photosynthetic partner is called the photobiont. The mycobiont provides structure and protection to the association.

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How do fungi benefit grazing animals?

A) Clean the digestive tract
B) Help digest cellulose
C) Provide camouflage
D) Supply blood nutrients

AI Explanation

Some fungi live in the digestive systems of grazing animals and help break down cellulose from plant material. This improves the animals' ability to obtain nutrients from grasses and other vegetation.

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The structure formed inside plant root cells by Glomeromycota is called:

A) Zygospore
B) Conidia
C) Arbuscule
D) Rhizoid

AI Explanation

Glomeromycota form arbuscules inside plant root cells during arbuscular mycorrhizal associations. These structures are the main sites for nutrient exchange between the fungus and plant.

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What do fungi receive from plants in mycorrhizal associations?

A) Oxygen
B) Photosynthates (e.g., glucose)
C) Nitrogen compounds
D) Hormones

AI Explanation

In mycorrhizal associations, fungi receive carbohydrates produced by plants through photosynthesis. In return, fungi help plants absorb water and minerals from the soil.

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Which structure is responsible for producing basidiospores in mushrooms?

A) Gills
B) Hyphae
C) Button
D) Stipe

AI Explanation

In mushroom-forming fungi, basidiospores are produced on basidia located on the gills beneath the cap. The gills provide a large surface area for spore production and release.

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What is the role of fungi in ant colonies according to the video?

A) Digesting leaves brought by ants
B) Making tunnels
C) Attacking ant larvae
D) Attracting predators

AI Explanation

Some ants cultivate fungi in their colonies, and the fungi break down plant material collected by the ants. The ants then use the cultivated fungi as a food source.

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Which essential elements are recycled by fungi through decomposition?

A) Oxygen and sulfur
B) Carbon and nitrogen
C) Water and silicon
D) Phosphorus and potassium

AI Explanation

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.