Biology Revision - Energy And Biomass In Food Chain

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Biology Revision - Energy And Biomass In Food Chain - Quiz

B1.5


Questions and Answers
  • 1. 

    Every time you move up a stage (trophic level) in a food chain there is...

    • A.

      More energy

    • B.

      Less energy

    • C.

      More biomass

    • D.

      Less biomass

    Correct Answer(s)
    B. Less energy
    D. Less biomass
    Explanation
    As you move up a trophic level in a food chain, there is a decrease in energy and biomass. This is because energy is lost as heat during metabolic processes and only a fraction of it is transferred to the next trophic level. Additionally, organisms at higher trophic levels require more energy to sustain themselves, resulting in less energy being available for growth and reproduction. Similarly, biomass decreases because each trophic level contains fewer organisms than the level below it, as energy is lost and not all of it is converted into new biomass.

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  • 2. 

    There is usually a fewer _________ of organisms as you move up a trophic level as well eg - 100 dandelions ... feed ... 10 rabbits ...which feed... 1 fox

    Correct Answer(s)
    number
    Explanation
    As you move up the trophic levels in a food chain, there is typically a decrease in the number of organisms. This is because energy is lost as it is transferred from one level to the next. The primary producers, such as plants, convert sunlight into energy through photosynthesis. However, only a small fraction of this energy is consumed by herbivores, such as rabbits, which in turn provide energy to their predators, like foxes. Therefore, each trophic level has fewer organisms than the previous one, resulting in a decrease in the number of organisms as you move up the food chain.

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  • 3. 

    However this is not always true as 100 dandelions ... feed ... 10 rabbits ...which feed... 1 fox ... which could feed... 500 fleas therefore its often better to look at ___________ rather than numbers of organisms.

    Correct Answer(s)
    biomass
    Explanation
    The explanation for the correct answer, biomass, is that it refers to the total mass of living organisms in a given area or ecosystem. In this scenario, the number of organisms alone does not accurately represent the amount of energy available for each level of the food chain. Biomass takes into account the size and weight of the organisms, which is a more reliable indicator of the energy available for consumption. Therefore, when considering the flow of energy through a food chain, it is often better to look at biomass rather than the numbers of organisms.

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  • 4. 

    Each bar on a pyramid of biomass = how much each level would 'weigh' if you put all the animals together. So the fox would have a much ______ biomass than the fleas 

    Correct Answer(s)
    larger
    Explanation
    The correct answer is "larger" because the question is asking about the biomass of the fox compared to the fleas. Biomass refers to the total weight of living organisms in a given area or ecosystem. Since the fox is larger in size than the fleas, it would have a greater biomass.

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  • 5. 

    Food chains - 
    • Plant - primary ________

    Correct Answer(s)
    producer
    Explanation
    In the context of food chains, a plant is considered a primary producer. This is because plants are able to produce their own food through the process of photosynthesis, using sunlight, water, and carbon dioxide to produce glucose and oxygen. They are at the beginning of the food chain, as they serve as a source of energy for other organisms. Therefore, the correct answer is "producer".

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  • 6. 

    Food chains - 
    • Plant - primary producer
    • _________ - primary consumer

    Correct Answer(s)
    herbivore
    Explanation
    In a food chain, plants are considered primary producers as they are able to produce their own food through photosynthesis. The next level in the food chain is occupied by primary consumers, which are organisms that directly consume plants for their energy and nutrients. Herbivores are a type of primary consumer as they exclusively feed on plant material. Therefore, herbivores are the correct answer for the missing term in the given question.

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  • 7. 

    Food chains - 
    • Plant - primary producer
    • Herbivore - primary consumer
    • _______ - secondary consumer

    Correct Answer(s)
    carnivore
    Explanation
    In a food chain, the primary producer is the plant that produces its own food through photosynthesis. The herbivore is the primary consumer that feeds on the plants. Therefore, the missing term would be the secondary consumer, which is the carnivore that feeds on the herbivores. Carnivores are animals that primarily eat meat, completing the food chain by consuming the primary consumers.

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  • 8. 

    Food chains - 
    • Plant - primary producer
    • Herbivore - primary consumer
    • Carnivore - secondary consumer
    • Carnivore - _________ consumer

    Correct Answer(s)
    tertiary
    Explanation
    In a food chain, the primary producer is the plant that produces its own food through photosynthesis. The herbivore is the primary consumer that feeds on the plants. The carnivore is the secondary consumer that feeds on the herbivore. Therefore, the next consumer in the food chain after the carnivore is the tertiary consumer.

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  • 9. 

    Food chains - 
    • Plant - primary producer
    • Herbivore - primary consumer
    • Carnivore - secondary consumer
    • Carnivore - tertiary consumer
    • ___ carnivore - quaternary consumer

    Correct Answer(s)
    top
    Explanation
    The term "top" is used to describe the position of an organism in a food chain or food web. In this context, a "top carnivore" refers to an organism that is at the highest trophic level and feeds primarily on other carnivores or omnivores. These organisms are typically large predators and have no natural predators of their own. They play a crucial role in regulating the populations of lower trophic levels and maintaining the balance of the ecosystem.

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  • 10. 

    Wet mass = 

    • A.

      Total mass when wet

    • B.

      Total mass including water

    • C.

      Total mass after rain

    • D.

      Mass of water in organism

    Correct Answer
    B. Total mass including water
    Explanation
    The term "wet mass" refers to the total mass of an object or organism when it is wet, which includes the mass of the water present. It is important to consider the water content when measuring the wet mass of something, as water can significantly contribute to the overall weight. Therefore, the correct answer is "total mass including water".

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  • 11. 

    Dry mass = 

    • A.

      Mass after rain

    • B.

      Mass when normal - not wet

    • C.

      Total mass exluding water

    Correct Answer
    C. Total mass exluding water
    Explanation
    The correct answer is "total mass excluding water." This refers to the mass of an object or substance without the presence of water. It represents the dry weight or mass of the material after any water content has been removed. This measurement is often used in various scientific and industrial applications to determine the true weight or mass of a sample without the interference of water.

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  • 12. 

    Respiration is the breakdown of _________ to release energy

    Correct Answer
    glucose
    Explanation
    Respiration is the process by which glucose is broken down to release energy. Glucose is a carbohydrate molecule that serves as the primary source of energy for cells. Through a series of biochemical reactions, glucose is oxidized, releasing energy in the form of ATP (adenosine triphosphate). This energy is then used by the cell for various metabolic processes, such as muscle contraction, active transport, and synthesis of molecules. Therefore, glucose is the correct answer for the given question.

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  • 13. 

    Energy losses are mainly due to...
    • _____ products - faeces and urine - not all food is digested and absorbed, some is lost in waste

    Correct Answer
    waste
    Explanation
    Energy losses are mainly due to waste products such as faeces and urine. Not all food is fully digested and absorbed by the body, so some of it is lost in the form of waste. This means that the energy contained in the undigested food is not utilized by the body and is instead excreted. Therefore, waste products contribute to energy losses in the overall system.

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  • 14. 

    Energy losses are mainly due to...
    • waste products - faeces and urine - not all food is digested and absorbed, some is lost in waste
    • _____ production - in warm blooded animals - produced by respiration

    Correct Answer
    heat
    Explanation
    The energy losses mentioned in the question are mainly due to waste products such as faeces and urine, which are not fully digested and absorbed by the body. However, in warm-blooded animals, another significant energy loss is through the production of heat, which is generated through the process of respiration. This heat production is necessary for maintaining a constant body temperature, but it also represents an energy loss that is not fully utilized by the organism.

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  • 15. 

    Energy losses are mainly due to...
    • waste products - faeces and urine - not all food is digested and absorbed, some is lost in waste
    • heat production - in warm blooded animals - produced by energy from respiration
    • m________ in animals - requires energy from respiration

    Correct Answer
    movement
    Explanation
    Animals require energy from respiration for movement. Movement involves the contraction and relaxation of muscles, which requires energy. This energy is produced through respiration, where glucose is broken down to release ATP, the energy currency of cells. Therefore, movement contributes to energy losses in animals.

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  • Current Version
  • Aug 24, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Nov 26, 2011
    Quiz Created by
    Izzy_
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