Write several methods for plants to spread seeds

Methods for spreading seeds

1. Animal spread

Those who spread seeds by animals Plants include cocklebur, tribulus, thorngrass, mountain grape, pine, cherry, pine nut, chestnut, etc. Seeds such as Pseudomonas aeruginosa and Xanthium angustifolia have stinging hairs and barbs on the outside, which will adhere to the fur of animals with just a light touch. Most plants such as cherries and wild grapes have fleshy fruits. After the fruits of these plants are eaten by birds, the seeds pass through the digestive tract and are excreted everywhere. Chestnuts, pine nuts, etc. will be moved home and stored by squirrels. Some of them will be eaten, and the rest will take root and sprout next year.

Please click to enter the image description

2. Wind spread

Plants that rely on wind to spread seeds include dandelions, willows, poplars, maples, etc. These plants Seeds are usually light in weight and can be suspended in the air, and the wind can carry them to the ends of the earth. The seeds of some plants also develop special structures suitable for flying with the help of wind, such as the fine villi on cotton and willow seeds, the umbrella-like pappus on dandelion fruits, and the wing-like structures on pine, maple, and elm seeds.

Please click to enter the image description

3. Water dispersal

Plants growing in or near water usually use water to spread their seeds, such as coconuts Trees, water lilies, etc. After the fruit of the coconut tree matures, the outer shell is hard and like a small boat drifting with the sea water, new coconut trees will grow after being washed ashore by the waves. When the water lily fruit matures, it will fall into the water and slowly rot. The seeds covered with a spongy outer seed coat will float, drift with the current on the water surface, and finally sink to the bottom of the water to take root and germinate.

Please click to enter the picture description

4. Ejection propagation

Ejection propagation means popping the seeds out like cannonballs. Common ones include rape, mustard, Peas, soybeans, mung beans, sorrel, impatiens, etc. After the seeds of these plants mature, the dry and hard peels often burst with a "pop" sound under the baking sun, and the seeds will fly out of the barrel of a gun. The bullet was ricocheted into the distance. The most interesting one is a plant called "Spray Melon". When the melon is mature, it will fall off at the slightest touch and spray the seeds inside the melon from the top in an instant.

Please click to enter the image description

5. Humans

Humans will also be used to help plants spread seeds. For example, when we eat fruit, we throw away the core. When the seeds inside meet suitable conditions, they will germinate and grow into fruit trees, such as the seeds of apples and pears.

Please click to enter the image description

6. Birds

Most of the seeds spread by birds are fleshy fruits, such as berries, stone fruits and cryptozoos. Flowers and fruits. Birds peck at the seeds of Lauraceae plants and spit out the seeds. After the fruit is eaten, the seeds pass through the digestive tract and are excreted at will. Plants that rely on birds to spread seeds are a relatively advanced group, because birds can spread seeds the furthest distance among all methods.

Please click to enter the image description

Web link

How plants spread seeds in the second grade of elementary school

How plants spread seeds in the second grade of elementary school Methods include: spreading by water, spreading by birds or other animals, spreading by wind, and spreading seeds by machinery.

Plants that spread their seeds by water power have their seeds covered with a thick and light protective layer filled with air. For example, coconut, water lily, water hyacinth, lotus pod.

Plants that spread their seeds through animal fur have hooks on their seeds. For example, cocklebur. A plant that spreads its seeds through the ingestion and defecation of animals. Its fruits are sweet and delicious, and the seeds are wrapped in a hard shell that is not easily digested. For example, cherries, apples, and persimmons.

There are two ways for plants to spread their seeds by animals. One is that after animals eat the fruits, they excrete the undigested seeds out of the body. One is that plants attach to animal fur and spread through animal movement.

Plants that rely on wind to spread their seeds will grow appendages that look like wings or feathers from their seeds. Such as poplar, willow, elm, maple, pine.

Mechanical dispersal means: after the fruit matures, the outer shell bursts and the seeds are ejected. For example, impatiens, peas, and sesame seeds.

Cherry, wild grape, wild ginseng: The seeds are eaten by birds or other animals. Since they cannot be digested, they are excreted in the feces and spread in all directions.

Pine nuts: They are taken away by squirrels when they store food for the winter.

Red willow: The seeds are spread far away by the flying catkins.

Dandelion: The achene of dandelion, a plant in the Asteraceae family, expands its pappus when mature, like a parachute, flying in the wind and spreading its seeds far away.

10 ways of plant propagation

Ejection mechanism, dynamic propagation, self-adhesion, thrust of water flow, animal propagation, wind blowing catkins, nectar attracting insects, self-elasticity Spread, propagated by wind.

Xanthium spp. rely on their own adhesion to adhere to animal fur or human clothing to spread their seeds.

The waxy surface of water-borne seeds does not stick to water, the peel contains air cells, and the specific gravity is lower than water. They can float on the water and spread through streams or ocean currents.

The seed coat of such seeds is often rich in fiber, which can prevent the seeds from rotting or sinking due to soaking and absorbing water. Examples of these seeds, such as chessboard leg, Heliconia truncatula and Terminalia elata, have typical water-borne diseases. of seeds.

Plants that spread seeds by animals include cockleburs, pine trees, cherries, oranges, tangerines, loquats, mountain grapes, etc. There are stinging hairs on cockleburs, which can easily stick to animals and then follow the animals to spread. The fruits of pine trees are stored by squirrels as winter food, thus completing the spread. When cherries, oranges, tangerines, loquats and other fruits are eaten by animals, the seeds fall to the ground, or are eaten into the stomachs of animals, and are then excreted in feces and spread.

Autotransmission: spread by the plant itself and does not rely on other communication media. The fruit or seed itself has weight. When mature, the fruit or seed will fall directly to the ground due to gravity; or when the fruit matures and cracks, ejection force will be generated to eject the seeds.

Second grade imitation of seed propagation

The imitation is as follows:

1. The doll of mother water lily will sink into the water as long as it is blown lightly with water. After the peel rots, the dolls settle in and make their homes.

2. What Mother Impatiens gives to her babies is like a time bomb. As soon as the sun shines, the babies will jump away from their mother.

3. The pine nut mother equips her child with weapons. As long as he hangs on the squirrel's fur, he can walk to the fields and mountains.

4. Do you know the secret of flying catkins in spring? If you grab a ball of catkins and observe carefully, you will find that there are some small particles inside, which are the seeds of the willow tree. The willow tree relies on the flying catkins to spread the seeds to distant places and settle down. There are also seeds of poplar trees and dandelions that can also fly.

5. Some plants disperse their seeds mechanically, and wood sorrel is one of them. It is a very common wild weed with small yellow or red flowers. After the flowers, there is a five-sided capsule. When mature, the fruit splits along the back of the chamber, the shell curls up, and the seeds pop out.

The main types of imitation sentences:

1. Specified format and topic:

The format specified for this type of imitation sentence questions is sentence structure or rhetoric, and the specified topic It can be a word or a clause. This type of imitation sentence questions have a consistent format and clear topics. When answering, you should first clarify the topic and maintain the unity of the topic when copying.

2. Specify the format, but do not specify the topic:

This type of imitation sentence questions mainly imitates sentence patterns and rhetorical methods, and creates sentences on topics of your own choice. The requirements for this type of imitated sentence are looser than the first type, that is, the format is consistent and the topic is not restricted.

Methods for sunflower seeds to spread

The methods for sunflower seeds to spread include natural spread, wind spread, water spread, animal spread, and mammal spread.

Autogenous propagation: When the sunflower is fully mature, it does not need to be propagated through other media. When the sunflower seeds or fruits reach a certain weight, they will naturally fall off the plant, and then the seeds will be propagated. Function, if the sunflower grows on a mountain or a relatively steep terrain, its seeds will spread farther by rolling down after falling. Wind dispersal: Sunflower seeds can also be spread by wind. The weight of sunflower seeds themselves is very light, and the effect of wind can carry them to other places, causing the sunflowers to take root and achieve the purpose of spreading seeds. .

This is also one of the ways sunflowers spread their seeds. Water spread: If the sunflower grows near a water source, then when the sunflower is fully mature, it will fall down due to its own weight and roll into the water. Then it will reach other places with the water source, so that it can be spread. The role of seeds. Bird dispersal: Seed dispersal by birds is efficient because it spreads the furthest.

Mammal transmission: Some mammals also feed on the fruits of plants, such as squirrels, macaques and other animals. They not only feed on the fruits of plants, but also like to pick the seeds of plants. In the process of storage, animals such as squirrels and macaques become the medium for sunflower seeds to spread.