What Happened to Plants lesson plan

Plants are constantly changing, some of which are more noticeable and some of which are not.

The changes in plants are manifested in various aspects, mainly in germination, growth, flowering, fruiting, etc.

Changes in plants are one of the characteristics of living organisms.

It is mainly about germination, growth, flowering, and fruiting.

Why is this question labeled Emotion...

1.Lack of light in plants: manifested as elongation and pale leaf color.

2.Lack of fertilizer: the color of the leaves becomes abnormal, reddish (except for some that are already red), light, yellow markings appear (some plants themselves have, to distinguish them), the growth is not vigorous, and the leaves are small.

3.Fertilizer: Scorched leaves.

4.Excessive light: the leaves are yellowing and scorched.

5.Dehydration: Leaves shrink.

6.Waterlogging: The roots are rotten and smelly, and the leaves are yellow and rotten.

7.Diseases: There are many types, large or small black spots, there are yellow spots around the black spots, and the leaves turn yellow and rot and are soft.

8.Pests: Leaves are mutilated, holes, leaves inexplicably appear white and yellow spots but do not rot (red spiders, you have to look carefully to see) 9

In autumn, the leaves become dormant this year: the leaves turn red and yellow as a whole, and stop growing. 10.

Spring enters the growth season: budding.

<> "What Plants Change Wonderfully.

1. Giant flower konjac.

The inflorescence of the giant flower konjac can be more than three meters high, and when it blooms, it will emit a smell similar to the smell of corpses, so it is also called corpse flowers, and it likes loose and fertile soil, mainly distributed in the tropical rainforests of Indonesia.

2. Baobab tree.

Also known as the bottle tree, the baobab tree has very smooth stems, branches and leaves mainly grow at the top, and the plant is tall, about 10-20 meters high, the biggest feature of the baobab tree is that it can store 300 liters of water.

3. Dracaena tree.

After being injured, the dragon's blood tree will flow out of a blood-colored liquid, which is a kind of resin, dark red, which can be used as a preservative or a raw material for painting jujube kai, and the dragon's blood tree likes a semi-shady growth environment, and is not resistant to strong light, otherwise the leaves will wither yellow.

4. Mimosa.

Mimosa is also called induction grass, drinking grass, its leaves are very sensitive, as long as you touch or shake it with your hand, the leaf early rock will roll inward or droop, even if a gust of wind blows, the mimosa will also appear this situation, a few minutes later, the leaves will open again.

Mainly leaves. Most trees sprout in the spring and slowly develop new leaves, and in the summer they are luxuriant, and some trees will bloom and bear fruit. In autumn, the leaves will slowly turn yellow, and in late autumn, there will be a group of fallen leaves.

In winter, only the branches remain, and the leaves are almost all gone. Some trees are evergreen, meaning they are green all year round and do not lose their leaves.

For example, the willow tree in spring has just grown small green buds, and from a distance, it seems to be a green silk thread. In summer, the willow tree has lush foliage, like a large dark green umbrella.

In autumn, the leaves of the willow trees begin to turn yellow and finally fall like butterflies. The golden leaves spread all over the earth, like a golden carpet. In winter, the leaves of the willow tree have fallen away, and only the gray branches are left to sway in the cold wind.

Changes in the growth of plants.

The beginning of a new life for plants.

Objective]: Scientific concept: The seeds of different plants have different external characteristics such as shape, size, color, etc.; Seeds have their own special structure and can germinate and grow into a plant under the right conditions.

Process and Methods: Observe the external morphological characteristics of seeds with sensory and magnifying glasses; According to the prior knowledge of plant growth, the internal structure of plant seeds.

Affective Attitude Values: Arouse interest in paying attention to changes in plant growth.

Focus: Lead students to ask questions and think positively, to be able to express their understanding clearly in an appropriate way, and to find ways to prove whether their guesses are correct.

Difficulty]: Observe the seeds of various plants.

Preparation] :(teacher prepares) cats to nurse kittens**, mother chickens take chicks to eat**, sunflower seedlings**, seeds of various plants (sunflowers, peanuts, green beans, pumpkin, wheat, corn, mung beans, etc.), white paper, magnifying glass. (Students prepare) seeds, white paper, and magnifying glasses for various plants.

The science teacher gave us a few impatiens seeds and told us to go back and plant them in the soil to observe their growth and changes.

After school, I planted a few impatiens seeds in a pot on my balcony. After watering, the seeds greedily suck the water and nutrients from the soil, and within a few days, they burst out of the darkness and into the light, sprouting buds.

The freshly grown impatiens buds are extremely green, and the leaves and petioles are tender green, which is very cute. When a gust of wind blows, the leaves ripple, and they are very beautiful. As time changes, the tiny impatiens shoots grow day by day and turn green.

In about a month and a half, the impatiens can grow to a height of 40 centimeters, and the impatiens begin to break the flower bones.

The flowers of impatiens are purple-red and are generally about one centimeter in diameter. The impatiens flower has three petals, and the middle resembles a small yellow lamp. Although the flower of the impatiens is not as elegant as the orchid and not as fragrant as the rose, it has a function that the orchid cannot match. Impatiens can kill insects, detoxify ......

Impatiens are very honest, and if they have a few flower bones, they will bloom a few flowers. In general, a single impatiens plant can produce many flowers. Growing impatiens purple red.

Dotted like jewels among the green leaves. The mouth of the impatiens is expanded outward, and the fruits are brown, and these fruits are the seeds of the impatiens, so don't touch it, or your hands may be pricked very painfully.

There are many ways to use impatiens, plus alum wrapped in paper and attached to the nails, after a few days, the nails will be like gemstones, and the vivid fuchsia color shines brightly on our eyes.

I love the beautiful impatiens.

Today, I saw the endless desert on TV. Suddenly I saw a few cacti, and two questions came to my mind: 1, the cactus asked what can survive in the desert, 2, what is the function of the cactus's thorns.

I ran over to my dad and he said, "You can find out for yourself." So I bought a cactus and observed it myself for 10 days, but I still didn't find anything. Mom came up and said, "Why don't you look up the books?" "This proposal struck me. ”

I found the encyclopedia, oh it turned out that the cactus asked what can survive in the desert because the climate in the desert is hot and the rain is scarce. The temperature difference between day and night is large, and many plants cannot grow here. The reason why the cactus can survive in the desert is that its roots are very deep in the sand, which absorbs water, and second, its stalks become fleshy and can store a lot of water.

The third is to degenerate the leaves into needles to reduce water evaporation, so they can survive in the desert.

What does the cactus spine do because the cactus thorn is a degraded cactus leaf, it protects the plant from being eaten by herbivores, and it also absorbs water from the air, and if it rains, it can also absorb rain constantly.

I've learned that as long as you use your brain, you can solve problems, and you can't look up books.

Plants change differently throughout the year. In the spring season, many plants quickly enter the growth period, germinating, growing, flowering... At this point, the children already have a certain life experience.

For them, the most impressive thing about autumn should be that the fruits are ripe, the trees are falling, and the grass is withering and yellow. It is easy for children to name the obvious changes, so they can observe the changes in the leaves and infer the growth and change of a leaf from the different sizes, softness and hardness of the leaves of a tree; From the process of changing the color of a leaf, the student learns that the leaf will senesce and die. The connection between these two observations actually shows the process of leaf growth, maturation, senescence, and death, and it is easier to derive the growth changes of the leaves.

Observing other changes in plants, such as what happens to plants in the field, roadside, and at home, in the fall, and including more plants in the scope of observation is conducive to the establishment of students' concept of changing plants, and it is also necessary for students' concept development. Students deeply understand that plant change is one of the characteristics of living organisms. However, for some insignificant changes, which need to be measured and recorded, can be found in the comparison, and this part, for the third grade students, the duration of the activity is too long, and it is more difficult to choose a tree or a grass to observe their changes in autumn and winter, and to observe and record them once a month.

Therefore, this lesson is a great challenge for students to understand and master scientific concepts well, but it is a great challenge for students to observe the changes of a tree or a grass in autumn and winter, which points to scientific skills.