During  a  field  trip,  an  instructor  touched  a  moth  resting  on  a  tree  trunk.  The  moth  raised  its  forewings  to  reveal large eyespots on its hind wings. The instructor asked why the moth lifted its wings. One student answered that sensory  receptors  had  fired  and  triggered  a  neuronal  reflex  culminating  in  the  contraction  of  certain  muscles.  A second student responded that the behaviour might frighten predators. Which statement best describes these explanations?

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#Question id: 11571

#Unit 7. System Physiology – Animal

Which of the following is the most likely explanation for hypothyroidism in a patient whose iodine level is normal?

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#Question id: 7245

#Unit 5. Developmental Biology

Gradients of Wnt are essential for normal regeneration of a head and a tail by planaria. Which one of the following statement is incorrect?

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#Question id: 5311

#Unit 11. Evolution and Behavior

Which of the following conclusions has led to the comparison between the number of human genes and those of other animal species?

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#Question id: 19126

#Unit 12. Applied Biology

A successful biosensor must have some of the following features such as.

1. Should be highly specific for the analyte 

2. Reaction used should be independent of factors like stirring, pH, temperature, etc. 

3. Response should be linear over a useful range of analyte concentrations

Which of the following above statements are correct?

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#Question id: 12428

#Unit 10. Ecological Principles

Flycatcher birds that migrate from Africa to Europe feed their nestlings mostly with moth caterpillars. The data presented show the mean dates of egg laying, hatching, and fledging of flycatcher young, and the 1980 and 2000 peak mass of caterpillars.

Why are ecologists  concerned about the shift in  date from May 28 in  1980 to May 15 in  2000 of the caterpillar peak mass?