2. Have you wondered how temperature changes with altitude? For example, at the cruising altitude of most jet aircrafts (between 9,000 and 12,000 m) the air temperature ranges from -40 °C to -57 °C. It can be approximated that every 100 m going up, the air temperature drops by about 1 °C. A group of tourists start its hike at the bottom of the Alatau mountain on a sunny day, when the temperature is 32 °C.
3. Phototropism combines the Greek photo, or "light," and tropism, "a turning". Put together the term phototropism refers to the movement of organisms towards light. In plants, phototropism helps to get the maximum amount of available energy by turning and growing in the sun’s direction. Auxin is the plant hormone that is responsible for phototropism. This hormone is concentrated in the head of the stem. Some students want to check the action of the auxin and put caps on the head of the stems. First cap is transparent (transmits the light), the second cap is opaque (does not transmit the light).
Which of the following diagrams best reflects the observations that will be made after a couple of
5. You are playing angry birds. Your goal is to send the bird as far as you can: