Q1.Match the following pairs:
- Frog living in pond – Habitat
- Interaction analysis of fish – Ecology
- Community of organisms in similar climate – Biome
- Region of earth supporting life – Biosphere
How many pairs are correctly matched?
a) Only two
b) Only three
c) All four
d) None
Answer: (c) All four
Explanation:
• Habitat = specific place of living (frog–pond).
• Ecology = interaction study (fish interactions).
• Biome = large community defined by climate.
• Biosphere = global life-supporting zone.
Q2. Which of the following are saprotrophs?
- Cyanobacteria
- Indian pipe
- Corallorhiza
- Mycorrhiza
- Coccolithophore
- Arthropods
a) 1, 3, 4, 6
b) 2, 1, 5, 6
c) 2, 3, 4, 6
d) 1, 2, 5, 6
Answer: (c) 2, 3, 4, 6
Explanation:
• Indian pipe (Monotropa) – saprophytic.
• Corallorhiza – saprophytic orchid.
• Mycorrhiza – fungal decomposers.
• Arthropods (detritivores) – saprotrophic role.
• Cyanobacteria & coccolithophores are autotrophic.
Q3. Consider the following
- Only a few environments are habitat – correct
- Habitat is part of ecosystem – correct
- Group of ecosystems is environment – incorrect
- Every habitat is an environment – incorrect
How many statements are correct?
a) Only one
b) Only two
c) Only three
d) All four
Answer: (b) Only two
Explanation:
• Habitat ⊂ ecosystem ⊂ environment.
• Environment includes physical + biotic surroundings; every habitat is not an “environment”.
Q4. Consider the following
Statement I: Intensity of light affects plant growth.
Statement II: Plants grown in green light are large; in ultraviolet light they remain dwarf.
a) Both correct and II explains I
b) Both correct but II does not explain I
c) I correct, II incorrect
d) I incorrect, II correct
Answer: (c) I correct, II incorrect
Explanation:
• Light intensity does influence growth (photosynthesis rate).
• Green light is least absorbed; plants do not grow large in it. UV inhibits growth.
Q5. Consider the following
- Crustaceans, insects, salmon tolerate a wide temperature range – correct (eurythermal)
- Goldfish, haddock, sea turtle tolerate wide salinity range – incorrect
Correct answer:
a) 1 only
b) 2 only
c) Both
d) Neither
Answer: (a) 1 only
Explanation:
• Eurythermal: insects, crustaceans, salmon.
• Euryhaline: salmon, eel; not goldfish/haddock/sea turtles.
