Question 261
Which of the following is an example of a keystone species that maintains ecosystem balance?EcologyEcologyhard
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NSC Life Sciences – South Africa
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Question 262
Which process results in the formation of gametes with half the chromosome number of the parent cell?ReproductionReproductionmedium
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Question 263
Which organ system in humans is primarily responsible for transporting oxygen to body cells?Human physiologyHuman physiologyeasy
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Question 264
Which of these is an example of a biotic factor in an ecosystem?EcologyEcologyeasy
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Question 265
Which hormone regulates the water balance in human kidneys?Human physiologyHuman physiologymedium
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Question 266
In an ecological pyramid, which trophic level typically has the smallest biomass?EcologyEcologymedium
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Question 267
Which of these is a key evidence supporting the theory of evolution?EvolutionEvolutionmedium
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Question 268
Which environmental study method involves observing organisms in their natural habitat without interference?Environmental studiesEnvironmental studieshard
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Question 269
Which molecule carries genetic information from DNA to the ribosome for protein synthesis?DNA and geneticsDNA and geneticseasy
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Question 270
Which process results in genetic variation by exchanging DNA segments between homologous chromosomes during meiosis?DNA and geneticsDNA and geneticsmedium
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