Why do the leaves of the ivy always point downwards? How does the ivy climb?

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1. Why do the leaves of ivy always face down?

2. How does a creeper climb?

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The reason why the leaves of the ivy always face downwards is that it climbs up the vertical wall one by one, and every time it climbs, its stems and leaves face upwards, so that the tips of its leaves will It naturally faces downwards due to gravity. And the leaves are evenly distributed, so they look straight down. The ivy climbs up one foot at a time through the suction cups on its feet. Every time it climbs, it clings to the wall and waits for new feet to grow out before continuing to climb up.

1. Why do the leaves of ivy always face down?

1. Why do ivy leaves face down?

The ivy leaves facing down are related to the direction in which the ivy climbs the wall. Because it climbs up one foot at a time, and when it grows one foot, it will firmly hold the wall and wait for new leaves to grow. Then it grows another foot and continues to climb up. Its feet are on the opposite side of the petiole. Once it climbs up, it will pull the entire stem upward, and the leaves will naturally point downward.

Every time a creeper climbs a step toward the wall, it will drive the stems and leaves, climbing the vertical facades. Over time, the leaves will turn their tips downward due to the earth's gravity.

Observation shows that the leaves of the ivy are not only facing down smoothly, but also distributed very evenly, with each leaf barely overlapping each other. This is actually a phenomenon called leaf mosaic. They will fill the gaps as much as possible to get more sunlight, and the leaves are staggered to ensure that all leaves receive relatively even light as much as possible. The mosaic effect of the leaves allows a larger area to receive sunlight, protects the rhizome, reduces water loss, maintains the humidity of the attached wall, and forms a good living environment suitable for its growth.

2. How does a creeper climb

< p>A creeper climbs up one foot at a time, rather than one foot at a time. There are tendrils on its branches, and there are sticky suckers on the top of the tendrils. These are its feet. When it encounters an object, it will stick to it and stay still. Every time it grows a foot, it will climb up, and then cling tightly to the wall without moving. Wait for new branches, leaves and new feet to grow, and then the new feet will continue to climb up in a relay manner. And it also branches, so there may be many feet climbing up at the same time.

2. How does a creeper climb?

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