Which of the following is a fungal disease of plants? MCQ with Answer and Explanation

Which of the following is a fungal disease of plants?
A. Late blight of potato
B. Citrus canker
C. Tobacco mosaic
D. Crown gall
Answer: Option A
Solution (By JKExamLibrary)
Late blight of potato is caused by the oomycete Phytophthora infestans (historically considered a fungus). It caused the Irish Potato Famine. Tobacco mosaic is viral, citrus canker is bacterial (Xanthomonas), crown gall is bacterial (Agrobacterium tumefaciens). Fungal plant diseases also include rust, smut, and powdery mildew. Oomycetes are now classified under Chromista but traditionally studied in mycology.

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Practice More Biology Questions

Question #1
The 'Red Data Book' keeps records of:
A. Fossil records
B. Endangered and threatened species
C. All living organisms
D. Human population

Correct Answer: Option B


Explanation:
The IUCN Red List (Red Data Book) documents the conservation status of plants, animals, and fungi, categorizing species from Extinct to Least Concern. It highlights species at risk of global extinction. It is a critical tool for conservation policy and action. Endangered species like the Bengal tiger and snow leopard are listed. The Red Data Book was first published by IUCN in 1964.

This question belongs to: Science Biology
Question #2
The part of the neuron that receives signals from other neurons is the:
A. Dendrite
B. Axon
C. Axon terminal
D. Cell body

Correct Answer: Option A


Explanation:
Dendrites are branched extensions of the neuron cell body that receive synaptic inputs from other neurons and transmit graded potentials towards the soma. The axon conducts action potentials away from the soma to the terminals, which then synapse with other cells. Dendrites have receptor sites for neurotransmitters.

This question belongs to: Science Biology
Question #3
Which of the following is a correct statement about viruses?
A. They are obligate intracellular parasites.
B. They contain both DNA and RNA.
C. They are living organisms that can reproduce outside a host.
D. They have cell walls like bacteria.

Correct Answer: Option A


Explanation:
Viruses are non-living outside a host cell and must hijack a host's cellular machinery to replicate, making them obligate intracellular parasites. They contain either DNA or RNA, not both (except some rare cases). They lack cell walls and metabolic machinery. Their status as living or non-living is debated, but they are biologically active only inside a host.

This question belongs to: Science Biology