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Heliotropism, a form of tropism, is the diurnal or seasonal motion of plant parts (flowers or leaves) in response to the direction of the Sun. The habit of some plants to move in the direction of the Sun, a form of tropism, was already known by the Ancient Greeks. They named one of those plants after that property Heliotropium, meaning "sun turn".
Leaves, stems, and green unripe fruit of the tomato plant also contain small amounts of the poisonous alkaloid tomatine, [36] although levels are generally too small to be dangerous. [36] [37] Ripe tomatoes do not contain any detectable tomatine. [36] Tomato plants can be toxic to dogs if they eat large amounts of the fruit or chew the plant ...
Sunflowers do not always point to the Sun. Flowering sunflowers face a fixed direction (often east) all day long, but do not necessarily face the Sun. [123] However, in an earlier developmental stage, before the appearance of flower heads, the immature buds do track the Sun (a phenomenon called heliotropism). Mature flowers face east. [124]
Poor plant uptake of a nutrient from the soil (or other growing medium) may be due to an absolute shortage of that element in the growing medium, or because that element is present in a form that is not available to the plant. [6] The latter can be caused by incorrect pH, shortage of water, poor root growth or an excess of another nutrient. [6]
Wildfires refer to an uncontrolled fire of vegetation where a decision is required whether to suppress it. [44] The UK has two fire seasons: spring and mid-late summer. Climate change is expected to significantly increase the number of days with a very high risk of wildfires, especially in the summer season.
Attempting ideological purity can be harmful. President Trump’s proposed tariffs would introduce new market distortions, as taxes always do. But other market imperfections are already present.
A potentially harmful phenomenon is making a resurgence this year, causing lakes to change color. NASA recently released overhead images of western Lake Erie and nearby Lake St. Clair turning ...
The reddish color of the Sun when it is observed through a thick atmosphere, as during a sunrise or sunset. This is because long-wavelength (red) light is scattered less than blue light. The red light reaches the observer's eye, whereas the blue light is scattered out of the line of sight.