Use the following diagram of a hypothetical food web to answer the following questions. The arrows represent the transfer of food energy between the various trophic levels.

Which letter represents an organism that could be a producer?

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#Question id: 12532

#Unit 6. System Physiology – Plant

In Arabidopsis some brassinosteroid mutants given below;

a) 3-week-old light-grown homozygous bri1 mutant shown a severe dwarf plant while heterozygous bri1 mutant exhibits wild-type morphology

b) 3-week-old light-grown homozygous cpd (constitutive photomorphogenisis and dwarfism) mutant exhibits a wild-type phenotype while heterozygous mutant shown a dwarf phenotype

c) The dark-grown det2 mutant has short, thick hypocotyls and expanded cotyledons while the dark-grown wild type has long, thin hypocotyl 

d) The dark-grown det2 mutant has exhibits a wild-type phenotype

Which of the following given mutants of brassinosteroid is correct?

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#Question id: 12533

#Unit 10. Ecological Principles

If the flow of energy in an arctic ecosystem goes through a simple food chain, perhaps involving humans, starts from seaweeds to fish to seals to polar bears, then which of the following could be true?

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#Question id: 12534

#Unit 10. Ecological Principles

Which of the following statements is correct about biogeochemical cycling?

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#Question id: 12535

#Unit 10. Ecological Principles

If you were tracking a nutrient molecule through an ecosystem, which of the following statements would you expect to verify?

TLS Online TPP Program

#Question id: 12536

#Unit 10. Ecological Principles

Which of the following properly links the nutrient to its reservoir?

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#Question id: 12537

#Unit 10. Ecological Principles

In terms of nutrient cycling, why does timber harvesting in a temperate forest cause less ecological devastation than timber harvesting in tropical rain forests?