Biodiversity — Flashcards
ICSE · Class 9 · Environmental Science
40 flashcards for Biodiversity (ICSE Class 9 Environmental Science) to test yourself on key terms and facts. Sample: "What is biodiversity?"
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What is biodiversity?
Answer
Biodiversity is the total variety of life and the interactions among organisms within ecosystems. It includes genetic diversity, species diversity, and ecosystem diversity.
Why is biodiversity important for life on Earth?
Answer
Biodiversity helps ecosystems stay stable, productive, and resilient. It supports air, water, food, medicines, raw materials, and natural balance in nature.
What are the three main types of biodiversity?
Answer
The three main types are genetic diversity, species diversity, and ecosystem diversity.
How does genetic diversity arise in a population?
Answer
Genetic diversity arises due to mutations, gene flow, genetic drift, and sexual reproduction. These processes create differences in genes within a species.
Why are traditional rice varieties often more resistant than genetically uniform high-yield varieties?
Answer
Traditional rice varieties have greater genetic diversity, so they are often better able to resist floods or pests. Genetically uniform varieties are more vulnerable because many plants respond in the…
What is species diversity?
Answer
Species diversity is the variety, number, and relative abundance of different species in an ecosystem or habitat.
Why do tropical rainforests usually have higher species diversity than deserts?
Answer
Tropical rainforests have warm temperatures and abundant rainfall, which support many species. Deserts have harsh dry conditions, so fewer species can survive there.
What is species richness?
Answer
Species richness is the total number of different species found in an area.
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