How do elms spread seeds?

question 1: how does elm spread its seeds? Ulmus pumila is the seed. When it matures and falls, it will float away with the wind, and it will germinate and grow where the soil is wet.

question 2: how does elm spread? The seeds of elm are samara, which are mainly spread by wind.

Elm (scientific name: Ulmus pumila L.): also known as Ulmus pumila and Ulmus pumila L., it is known as "Ulmus pumila" and is a deciduous tree of Ulmus pumila. The bark of young trees is smooth, grayish brown or light gray, and the bark of big trees is dark gray, irregular and deeply longitudinal, and rough. Branchlets are glabrous or hairy, without swollen cork layer and raised cork wings; Winter buds are nearly spherical or ovoid. The leaves are oval, oval, etc., the leaves are smooth and hairless, the back of the leaves is pubescent when they are young, then they become hairless or some veins have tufted hairs, and the petiole surface is pubescent. The flower leaves open first, and it is clustered in the leaf arc of the branch. Samara is sparsely obovate and round. The flowering and fruiting period is from March to June (later in Northeast China).

question 3: how does elm spread its seeds? 1 points. Hello, elm seeds are samara, which is mainly spread by wind.

question 4: how do coconut, elm and banyan spread seeds respectively? 1. Coconut, the fruit of coconut tree, is composed of a shell with outer layer of fiber, which provides coconut skin fiber and big nuts with edible thick meat. When the fruit is fresh, there is a clear liquid called coconut juice. Produced in the tropics.

use seeds to propagate. Fully mature coconuts will germinate in more than two months as long as there are proper temperature and humidity conditions. The method of accelerating germination by preparing nursery is widely used in Hainan. Choose a semi-shaded, well-ventilated and well-drained environment, remove the roots of weeds, plow to a depth of 15-2 cm, ditch with a width slightly wider than that of the fruits, and bury the fruits one by one at an angle of 45 degrees to the bottom of the ditch to half to two thirds of the fruits. When the bud is 1-15cm long, move the bud to a nursery with moderate shade

coconut

, and pay attention to watering, drainage, weeding and fertilization. Generally, about one year, the seedlings can be planted out of the nursery when they are about 1 meter high.

2. Deciduous trees, up to 25m. The trunk is upright, with many branches, and the crown is nearly spherical or oval. The bark is dark gray, rough and irregularly longitudinal. Simple leaves alternate, oval to elliptic-lanceolate, with multiple serrations. The flowers are bisexual, with early spring leaves blooming or flowers and leaves blooming together, purple-brown, and cymes clustered. Samara is nearly round, with a notch at the top. Flowering from March to April; The fruit ripening period is from April to May.

geographical distribution occurs in northeast, north, northwest and east China. There is natural distribution in this area. In the past, rural greening was widely used, and it was generally used in gardens and factories in cities. In recent years, it is basically not used for afforestation, and the natural germplasm resources have been seriously damaged, and the number has dropped sharply.

Ecological habits

Positive tree species are light-loving, drought-tolerant, cold-tolerant, barren-tolerant, and have strong adaptability. Developed root system, strong wind resistance and soil conservation. Strong germination and pruning resistance. Fast growth and long life. Not resistant to water and humidity. It has anti-pollution and strong dust retention ability on the leaves.

seedling cultivation

mainly adopts sowing propagation, and can also be propagated by tillering and cutting. Sowing should be carried out with picking. The picture of elm < P > weighs 7.7 grams, and the germination rate is 65% ~ 85%. The survival rate of cutting propagation is high, reaching about 85%, and the cutting seedlings grow fast. Extensive management.

3. Ficus microcarpa, a Ficus tree of Moraceae, is native to tropical Asia. Banyan is famous for its peculiar tree shape, lush foliage and huge crown. The aerial roots growing on the branches extend down into the soil to form a new trunk called "pillar roots". The banyan tree is 3 meters high and can stretch in all directions indefinitely. Its pillar roots and branches are intertwined, which looks like a dense jungle, so it is called "a single tree into a forest".

Propagation method: sowing, cutting, high pressure or grafting can be used.

(1) Cutting propagation When a large number of seedlings are raised in South China and Southwest China, cuttings are often carried out on open seedbeds in rainy season, and the survival rate can reach over 95%. In the north, one-year-old full branches can be picked in pots, wooden boxes or seedbeds in early May. Cut the branches in three sections, keep 1-2 leaves at the tip and insert them into the plain sand; Shade maintenance, spray water 1-2 times a day to improve the air humidity. It is not necessary to cover with plastic film, but pay attention to wind protection. After 2 days, it can take root one after another, and after 45 days, it can be planted in pots.

(2) layering propagation In order to cultivate large seedlings, layering can be carried out by using the soft characteristics of the big branches of the lattice tree. First, put a big flowerpot near the mother plant, and fill it with pot soil. Then, choose a big lateral branch with good shape and bend it down and bury it in the flowerpot, and press stones on it. The buried part can take root without carving. After two months, cut it off from the mother plant to form a larger potted plant. You can also select a few thick lateral branches on the crown of the mother plant for high-pressure propagation, which is not only quick to form, but also simple to operate.

cultivation management:

Ficus microcarpa is strong in nature, and the selection of cultivation soil is not strict. As long as the soil is well drained but not sticky, it can grow. If the soil is fertile, it will naturally flourish. The cultivation place needs good sunshine, likes high temperature and humidity, and is extremely drought-tolerant. Spring to autumn is the peak growth period, and the suitable growth temperature is 23 ~ 32 degrees Celsius. It has strong adaptability and can grow normally under extensive cultivation conditions. When the seedlings are raised, they should be brought with intact soil. When potted, they should be put in pots with alkali-free culture soil, and the pots should be turned over and changed once every 2-3 years. When watering, master the principle of watering rather than drying, and don't suffer from drought; Fertilization should not be too much, and it should not be planted in large pots, so as to prevent the branches from growing in vain and making the tree shape out of control. Top-dressing liquid fertilizer can be used 3-5 times a year. In winter, you can enter the medium-temperature greenhouse for wintering, and you should see more sunshine. The furnishings in the general family room will not be frozen.

The main purpose of potted Ficus microcarpa is to make tree bonsai, and a large potted plant can cultivate one 1.5-2 ... >; >

Question 5: How do the seeds of elm spread? The seeds of elm are elm money, and when the seeds mature, they are of course spread by wind.

Question 6: How do banyan trees spread seeds? The fruit of banyan is one of the favorite foods for some birds, especially Pulsatilla chinensis and green hydrangea, but the indigestible seeds travel around with their droppings. The banyan seeds that pass through the birds' intestines and stomach are particularly easy to germinate, and they settle in Geng wherever they fall.

Question 7: How do poplars and willows spread their seeds? The willows spread their seeds far away to settle down. Also flying are the seeds of poplar and dandelion.

question 8: what kind of seeds spread? When fruits and seeds mature, they usually spread by wind, water and animals.

seeds or fruits spread by the wind are very light in structure. For example, the round wings around the elm fruit and the double wings of the maple tree are all adapted to wind propagation. Dandelion achenes are very small, with crown hairs on the top, like a parachute. When it is mature, it will fly as long as the wind blows gently and go to the distance to "settle down".

Some activities of people and animals often help plants spread seeds intentionally or unintentionally. For example, the seeds of Bidens bipinnata, Xanthium sibiricum and other plants have hooks or thorns, which can be hooked on animal fur and people's clothes and taken to a distant place. Some birds often like to eat the fruits of some plants. The seed coats of these plants are hard and difficult to digest, so when birds excrete feces, the seeds come out and sprout and grow in new places.

water flow is also a way to spread seeds and fruits. After heavy rain, many fruits and seeds are often washed to other places. Coconut is not afraid of flooding, but also can float. It can cross the ocean, so it grows on tropical islands and coasts.

Some plants spread seeds by their own special functions. For example, when the pods are ripe, they will crack and pop out the seeds. This way is called self-propagation.

Question 9: How do plants spread seeds? Teaching objective: Knowledge objective: Understand several common ways of spreading seeds, understand the relationship between the structure of seeds and fruits and the ways of spreading seeds, and gain direct knowledge about plant diversity, plants and animals, and human beings. Ability goal: let students go through the inquiry process of finding evidence and verifying speculation by means of observation, hypothesis, measurement and experiment; Emotion, attitude and values: stimulate interest in exploring plant seeds and fruits; Teaching emphasis: guide students to carry out activities such as observation, experiment and discussion, and understand the four modes of plant transmission: wind transmission, water transmission, animal transmission and self-transmission. Difficulties in teaching: Guess and guess how different plants spread seeds to distant places. Teaching preparation: teacher preparation: ① pea pods, amaranth fruits and seeds, morning glory fruits and seeds, dandelion fruits, Datura stramonium fruits and seeds, Bidens bipinnata and Xanthium sibiricum; ② Ruler, Petri dish, magnifying glass and record sheet; Students' preparation: Investigate, consult and surf the Internet to collect information about seed spread and collect dandelion fruits. Teaching process: (1) Stimulate interest and reveal topics: 1. Play slides: show plants such as flowers and plants growing in the wild, houses, walls and rock crevices. 2. Question: How do plants grow in these places? (Design intention) Use questions to arouse students' interest in research, guide students to pay attention to common natural phenomena around them, actively think about problems and explore the mysteries of nature. 3. Students report and communicate. 4. Students really know a lot. In fact, there are many ways to spread seeds of plants. In this lesson, let's explore how plants spread seeds. (Writing on the blackboard:) (2) Watch the video and learn something new. Let's see how plants in nature spread their seeds. (Play video materials) (3) Observation and discussion, experimental verification 1. Show the pictures of dandelion, Bidens bipinnata, Xanthium sibiricum, pea pods, morning glory fruits and seeds, Datura stramonium and lotus. Teacher asked: Do you know these plants? Their fruits are ripe. How do they spread their seeds? Is the method the same? Let's verify it together. 2. Please see the experimental requirements: (1) Observe dandelion seeds with and without villi removal and Xanthium sibiricum seeds with and without barbs removal with a magnifying glass. (2) Blow dandelion seeds with and without villi removal to see their movement. (3) Touch Xanthium sibiricum with clothes, and then shake the clothes or jump. (4) Have a look, touch and talk about the external characteristics of pea pods. Its seeds are wrapped in pods. How can it spread? Twist or smash the pea pod, and the pod will burst suddenly, thus ejecting the pea seeds. ) Hold the pea pod with your hand, stand it on the table and crack it, see how the seeds move and measure how far it is; Then lift the pod to crack it and see how far the seeds run. (5) Hold the handle of the morning glory fruit, poke the fruit on the table (put a piece of paper on the table), and measure how far the seed can jump. 3. Please carry out activities according to the requirements, and then guess and talk about the structural characteristics of the seeds of dandelion (Xanthium sibiricum), amaranth, pea pods, morning glory and Datura. How will it spread? And record the findings in observation and communication on the Experimental Record Sheet. I hope the group leader will control the volume, assign students to record while doing experiments, and tidy up the appliances and experimental record sheets after the experiments, so as to prepare the report. The name of the plant, the characteristics of seeds (fruits), the mode of transmission, dandelion Xanthium Datura pea pods Petunia Bidens 4. Students report and exchange observation results. Teacher: Which group will report its findings? 5. Student report: Dandelion seeds are light and fluffy. Blow them gently with your mouth or fan them with your hand, and the seeds will fly into the air with the wind, float around and finally fall to the ground. When you touch Xanthium sibiricum with clothes, Xanthium sibiricum will hang on the clothes, shake the clothes and jump without falling. 6. Teacher's summary: The fruits and seeds of many plants walk in the wind. They are generally small and light, and can be suspended in the air and blown far away by the wind. The fruits and seeds of some plants are spread by animals and humans. These fruits and seeds are covered with bristles, barbs or mucus secretion, which can be hung on or adhered to animals' hairs, feathers or people's clothes, and they are inadvertently spread to distant places with the activities of animals and people. Aquatic and swamp plants, fruits and seeds are often transported by water. Lotus fruit, commonly known as lotus. It is in the shape of an inverted cone, with loose tissue and light weight. It floats on the water surface, travels everywhere with the water, and spreads the seeds far and wide. Like dandelion, elm, maple and amaranth, it is spread by wind ... > >