Euglenoids are placed in which kingdom of the five-kingdom classification? MCQ with Answer and Explanation

Euglenoids are placed in which kingdom of the five-kingdom classification?
A. Fungi
B. Protista
C. Monera
D. Plantae
Answer: Option B
Solution (By JKSSB Mock Tests)
Euglenoids are unicellular eukaryotic organisms that possess characteristics of both plants (chloroplasts for photosynthesis) and animals (lack of a cell wall and presence of a flagellum for movement). Due to their unique features and unicellular nature, they are classified under the Kingdom Protista.

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Practice More Biology Questions

Question #1
The conversion of ammonia (NH3) to nitrites (NO2-) and then to nitrates (NO3-) by bacteria is called:
A. Nitrification
B. Nitrogen fixation
C. Denitrification
D. Ammonification

Correct Answer: Option A


Explanation:
Nitrification is a two-step process in the nitrogen cycle where ammonia is oxidized to nitrates. First, ammonia (NH3) is converted to nitrites (NO2-) by bacteria like Nitrosomonas. Then, nitrites are converted to nitrates (NO3-) by bacteria like Nitrobacter. Nitrates are the primary form of nitrogen absorbed by plants. Denitrification is the reverse process, converting nitrates back to nitrogen gas.

This question belongs to: Science Biology
Question #2
In the context of environmental pollution, 'Minamata disease' in Japan was caused by the severe contamination of water with:
A. Cadmium
B. Lead
C. Methylmercury
D. Arsenic

Correct Answer: Option C


Explanation:
Minamata disease is a severe neurological syndrome caused by severe mercury poisoning. It was first discovered in Minamata city, Kumamoto prefecture, Japan, in 1956. It was caused by the release of methylmercury in the industrial wastewater from the Chisso Corporation's chemical factory, which contaminated the local bay and the fish and shellfish. People who consumed the contaminated seafood suffered from severe neurological damage, including ataxia, numbness, and muscle weakness.

This question belongs to: Science Biology
Question #3
Which of the following is an abiotic component of an ecosystem?
A. Decomposers
B. Consumers
C. Soil
D. Producers

Correct Answer: Option C


Explanation:
Abiotic components are non-living physical and chemical factors of an ecosystem, including soil, water, temperature, light, and minerals. Biotic components include producers (plants), consumers (animals), and decomposers (bacteria, fungi). The interaction between abiotic and biotic components drives ecosystem functions. Soil provides nutrients and a medium for plant growth.

This question belongs to: Science Biology