- Mycorrhiza is an example of:
a) Commensalism
b) Mutualism
c) Parasitism
d) Saprophytism
Answer: b) Mutualism
Explanation:
Mycorrhiza is a mutualistic association between fungi and plant roots, where the fungus helps the plant absorb nutrients, and the plant provides carbohydrates to the fungus.
- The organisms belonging to kingdom Monera are:
a) Unicellular and prokaryotic
b) Multicellular and eukaryotic
c) Unicellular and eukaryotic
d) Multicellular and prokaryotic
Answer: a) Unicellular and prokaryotic
Explanation:
Organisms in the kingdom Monera, like bacteria and cyanobacteria, are unicellular and prokaryotic, lacking a true nucleus and membrane-bound organelles.
- Which of the following is true for slime molds?
a) They belong to the kingdom Monera
b) They are saprophytic protists
c) They have a chitinous cell wall
d) They reproduce sexually only
Answer: b) They are saprophytic protists
Explanation:
Slime molds are saprophytic organisms in the kingdom Protista. They feed on decaying organic matter and reproduce by spores.
- Which of the following groups of organisms are capable of living in extreme environments?
a) Cyanobacteria
b) Archaebacteria
c) Fungi
d) Algae
Answer: b) Archaebacteria
Explanation:
Archaebacteria can thrive in extreme environments, such as high temperature, high salinity, or low oxygen conditions, due to their unique cellular adaptations.
- The five-kingdom system of classification was proposed by:
a) Linnaeus
b) Haeckel
c) Whittaker
d) Margulis
Answer: c) Whittaker
Explanation:
R.H. Whittaker proposed the five-kingdom system of classification in 1969, dividing life into Monera, Protista, Fungi, Plantae, and Animalia.
- Which of the following is a feature of prokaryotic cells?
a) True nucleus
b) Membrane-bound organelles
c) Plasmids
d) 80S ribosomes
Answer: c) Plasmids
Explanation:
Prokaryotic cells, such as bacteria, contain plasmids, which are small, circular DNA molecules that can replicate independently of the chromosomal DNA.
- Which of the following is not a member of the kingdom Fungi?
a) Penicillium
b) Saccharomyces
c) Volvox
d) Rhizopus
Answer: c) Volvox
Explanation:
Volvox is a green algae that belongs to the kingdom Plantae, not Fungi. Penicillium, Saccharomyces (yeast), and Rhizopus are fungi.
- Which of the following bacteria is responsible for converting atmospheric nitrogen into ammonia in leguminous plants?
a) Azotobacter
b) Rhizobium
c) Nitrosomonas
d) Nitrobacter
Answer: b) Rhizobium
Explanation:
Rhizobium bacteria live in the root nodules of leguminous plants and fix atmospheric nitrogen into ammonia, making it available for the plant to use.
- Which of the following kingdoms contains organisms that are mainly autotrophic?
a) Animalia
b) Fungi
c) Plantae
d) Monera
Answer: c) Plantae
Explanation:
The kingdom Plantae consists mainly of autotrophic organisms that produce their own food through photosynthesis using chlorophyll.
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