Plant shoots exhibit positive phototropism by growing towards the light, while their roots exhibit negative phototropism by growing away from light. The hormone auxin directs this process. Auxin increases in concentration on the side of the shoots and the roots that faces away from the light. Auxin has different effects in each of these locations.

What is the best explanation of how auxin directs phototropism in plant shoots?

Use this dichotomous key for insect identification to identify the insect shown. 1. a. insect has one pair of wings. order diptera b. insect has two pairs of wings. go to #2 2. a. front wings thicker in texture than hind wings go to #3. b. front and hind wings are same texture throughout. go to #4 3. a. front wings are short order dermaptera b. front wings cover entire abdomen order coleoptera 4. a. wings with scale on all parts of their area. order lepidoptera b. wings without scales go to #5. 5. a. hind wings smaller than front wings. order ephemeroptera b. front and hind wings nearly equal in size. order odonata the insect pictured is in the order diptera. ephemeroptera. coleoptera. odonata.