GS Biology Questions and Answers

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Q321
Among the following, which plant is completely devoid of roots?
  • A Ceratophyllum
  • B Hydrilla
  • C Vallisneria
  • D Azolla
Answer: Option A
Explanation: Ceratophyllum is a rootless aquatic plant.
Q322
What is the name given for an association of two species where one is benefited and the other remains unaffected or unharmed?
  • A Parasitism
  • B Symbiosis
  • C Commensalism
  • D Predation
Answer: Option C
Explanation: Commensalism benefits one species without harming or benefiting the other.
Q323
Occurrence of Zoochlorellae in the body wall of Hydra is an example of
  • A predation
  • B food chain involving a parasite
  • C commensalism
  • D mutualism
Answer: Option D
Explanation: Both organisms benefit in mutualism.
Q324
Which one of the following is a protective device?
  • A Competition
  • B Camouflage
  • C Commensalism
  • D Symbiosis
Answer: Option B
Explanation: Camouflage helps organisms avoid predators by blending with surroundings.
Q325
What is the sequence of species through which organic molecules in a community pass called?
  • A Pyramid of energy
  • B Nutrient cycle
  • C Food web
  • D Food chain
Answer: Option D
Explanation: Food chain represents sequential feeding relationships.
Q326
A food chain consists of
  • A producers and primary consumers
  • B producers, herbivores and carnivores
  • C producers, consumers and decomposers
  • D producers, carnivores and decomposers
Answer: Option C
Explanation: All these groups participate in food chains.
Q327
Which of the following is the correct sequence in food chain?
  • A Fallen leaves → bacteria → insect larvae → birds
  • B Phytoplankton → zooplankton → fish
  • C Grasses → fox → rabbit
  • D Grasses → chameleon → insects → birds
Answer: Option B
Explanation: This is a typical aquatic food chain progression.
Q328
Generally, the food chain has how many trophic levels?
  • A One
  • B Two
  • C Three
  • D Three or four
Answer: Option D
Explanation: Food chains usually have three to four trophic levels.
Q329
Correct path of energy flow in a system is
  • A Producers → Herbivores → Carnivores → Decomposers
  • B Producers → Carnivores → Herbivores → Decomposers
  • C Herbivores → Producers → Carnivores → Decomposers
  • D Herbivores → Carnivores → Producers → Decomposers
Answer: Option A
Explanation: Energy flows from producers up to decomposers in order.
Q330
When man eats fish, which feeds on zooplanktons, which have eaten small plants, the producer in the chain is
  • A zooplankton
  • B small plants
  • C man
  • D fish
Answer: Option B
Explanation: Small plants like phytoplankton are primary producers.

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