The body weight of offspring of bird species is range between 12 gm to 18 gm. In a laboratory experiment, species was subjected to selection pressure having influence on the offspring body weight. After many generations of experimental selection pressure, the body weight range between 16 gm to 24 gm. Which of the following natural selection operate on this species?

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#Question id: 4941

#Section 2: Evolution

Which of the factors below weaken the hypothesis of abiotic synthesis of organic monomers in early Earthʹs atmosphere?

1.  the relatively short time between intense meteor bombardment and appearance of the first life forms

2.  the lack of experimental evidence that organic monomers can form by abiotic synthesis

3.  Uncertainty about which gases comprised early Earthʹs atmosphere

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#Question id: 11931

#Section 1: Ecology

Sexual dimorphism may arise from: 

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#Question id: 9185

#Section 2: Evolution

Plants are affected by an array of pathogens. Which of the following is a plant defense against disease?

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#Question id: 10897

#Section 1: Ecology

When three species of sunfish with similar niches were all placed in the same experimental pond, each made use of resources that they did not exploit in the absence of the other species. This scenario is referred to as

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#Question id: 7453

#General Aptitude

What will be the angle between the hour and minute hands at 6 : 15 ?