Which organism is an example of a secondary consumer?
A frog is a secondary consumer as it feeds on primary consumers like insects.
Ref: NCERT Class 12 Biology Chapter 12: Ecosystem Ecosystem Services and Functions
#food chains
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Which trophic level has the least energy available to it?
Tertiary consumers occupy the highest trophic level and receive the least energy due to energy loss at each transfer.
Ref: NCERT Class 12 Biology Chapter 12: Ecosystem Ecosystem Services and Functions
Which of the following statements about trophic levels is incorrect?
Carnivores do not belong to the second trophic level; they are secondary or tertiary consumers.
Ref: NCERT Class 12 Biology Chapter 12: Ecosystem Ecosystem Services and Functions
Which of the following statements about energy transfer in food chains is incorrect?
Consumers gain less energy than producers due to energy loss at each trophic level.
Ref: NCERT Class 12 Biology Chapter 12: Ecosystem Ecosystem Services and Functions
Which of the following best explains why energy transfer between trophic levels is inefficient?
Energy transfer is inefficient because most energy is lost as heat due to metabolic activities, limiting the amount transferred to the next level.
Ref: NCERT Class 12 Biology Chapter 12: Ecosystem Ecosystem Services and Functions
Which of the following organisms is an example of a tertiary consumer?
A snake is a tertiary consumer in a food chain, as it feeds on secondary consumers like frogs.
Ref: NCERT Class 12 Biology Chapter 12: Ecosystem Nutrient Cycling - Carbon Phosphorus and Ecological Succession
Which trophic level do secondary consumers occupy in a food chain?
Secondary consumers occupy the third trophic level in a food chain, feeding on primary consumers.
Ref: NCERT Class 12 Biology Chapter 12: Ecosystem Nutrient Cycling - Carbon Phosphorus and Ecological Succession
Which of the following statements about biological magnification is incorrect?
Toxic substances increase in concentration as they move up the food chain, affecting top predators the most.
Ref: NCERT Class 12 Biology Chapter 12: Ecosystem Nutrient Cycling - Carbon Phosphorus and Ecological Succession
Which of the following statements about food chains is incorrect?
Food chains do not always begin with decomposers; they usually start with producers like plants.
Ref: NCERT Class 12 Biology Chapter 12: Ecosystem Energy Flow - Food Chains Food Webs Trophic Levels
Which of the following statements about food chains is incorrect?
Food chains do not exist independently; they interconnect with other food chains to form a food web.
Ref: NCERT Class 12 Biology Chapter 12: Ecosystem Energy Flow - Food Chains Food Webs Trophic Levels
Which of the following is a major difference between a grazing food chain and a detritus food chain?
Grazing food chains begin with living plants, while detritus food chains start with dead organic matter that decomposers break down.
Ref: NCERT Class 12 Biology Chapter 12: Ecosystem Energy Flow - Food Chains Food Webs Trophic Levels
Which of the following statements about detritus food chains is correct?
The detritus food chain begins with dead organic matter, which is broken down by decomposers before being passed on to consumers.
Ref: NCERT Class 12 Biology Chapter 12: Ecosystem Energy Flow - Food Chains Food Webs Trophic Levels