Question

explain with the help of a diagram how the structure of dandelion seeds helps them to disperse

Answer 1

Answer:

Here is your answer

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Explanation:

Following are the various methods of seed dispersal:

Dispersal by Wind:

Seeds of some plants are light-weight and some hair-like or wing-like structures are present on them. Such seeds float on air and are thus dispersed by wind. Example: Dandelion, maple, drumstick, etc.

Dispersal by Water:

Dispersal by water takes place in some aquatic plants and in some which grow near a water body. Seeds of water lily float and thus dispersed by water. The coconut seed has a tough fibrous covering which has plenty of air inside. This helps the coconut seeds in floating on water.

Dispersal by Animals:

Some seeds have spine-like structures on them. They get stuck to the fur of animals and thus get spread to different places. Examples; Beggar tick, Xanthium, etc. Some seeds are swallowed by birds and animals along with fruits. These seeds get dispersed with bird or animal droppings.

Dispersal by Bursting: Some fruits burst open when they mature. The force of bursting is enough to spread the seeds. Examples; Ladyfinger, castor, balsam, etc.

Dispersal by Humans:

Human beings also help in dispersal of seeds, especially during farming.

Answer 2

Answer:

The pappus, which resembles a windsail, opens and closes in reaction to moisture.

Explanation:

• Although there are various ways for plants to disperse their seeds, the majority of these methods fall under the headings of gravity, wind, water, and animal dispersal.
• Each dandelion seed is linked to a pappus, which gets its name from the ancient Greek word for grandfather because of how much it resembles a beard and consists of about 100 fluffy bristles.
• By dragging on the air almost like a parachute, this structure delays the drop of seeds, allowing horizontal breezes to help move the seeds further.
• In warm, dry, windy conditions, some dandelion seeds may travel more than a kilometer, but the majority likely settle within 2 meters of their parent blooms.
• There are many other plants besides dandelions that employ the wind to help spread their seeds.

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