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Vegetable Features and Cultivation Techniques

Vegetables are grouped by the part we eat: leaf, stem, root, flower, fruit or seed. Growth needs the right temperature, light, water and soil. Farmers control these with shade, cover, mulch and irrigation. New plants come from seeds, cuttings or grafting; breeders make better varieties and hybrids.

🎬 Step-by-step story

  1. Here is one plant with all its parts: root, stem, leaf, flower and fruit. Each part can be a vegetable.
  2. The leaf is glowing. Leaf vegetables like spinach and cabbage are leaves. We eat them while they are green and soft.
  3. Now the root is glowing. Carrot and radish are roots that store food under the soil.
  4. Now the fruit is glowing. Tomato and brinjal are fruits. Tap the other buttons to see flower, stem and seed vegetables.
  5. Watch the temperature. At 8 degrees the plant grows little. At about 22 it grows best. At 38 it is stressed and shrinks.
  6. Your turn. Tap a part to see its vegetables. Slide the temperature to find the best growing range.

Tip: drag the 3D scene to turn it. Use two fingers to zoom.

🤔 Common doubts, cleared

Is a tomato a fruit or a vegetable?

In botany it is a fruit because it holds seeds and grows from a flower. In the kitchen we call it a vegetable. Tap Fruit to see it.

Why do leaf vegetables turn bitter when they flower?

The plant moves its energy to flowers and seeds and the leaves toughen. So we pick leaf crops before flowering.

Is a root vegetable the same as the plant's root?

Yes. Carrot and radish are swollen roots that store food. Potato is different: it is a stem.

Why does the plant shrink at 38 degrees?

Heat makes the plant lose water faster than roots can supply it, so it wilts and growth stops. See the plant shrink.

Which temperature is best for all vegetables?

There is no single one. The slider shows a best range for this plant, and each crop has its own.

Types and features of vegetables

The easiest way to sort vegetables is by the part we eat.

We can also sort by season: cool-season crops (spinach, carrot, cabbage) and warm-season crops (tomato, brinjal, okra).

How vegetables grow

A seed sprouts into a small plant. Leaves make food using sunlight (photosynthesis). The plant then grows bigger (vegetative growth), makes flowers (flowering) and fruits (fruiting). For leaf vegetables we harvest during vegetative growth. For tomato we need flowers and then fruit. If a leaf crop flowers too early (bolting), the leaves turn tough and bitter.

Roots take up water and minerals. Water moves up through the stem. The plant breathes through tiny holes in leaves called stomata.

Environment and growth control

Growth depends on temperature, light, water, air and soil. Each crop has a best temperature. Too cold slows growth; too hot makes flowers drop and plants wilt. Farmers adjust the environment with shade nets in summer, plastic tunnels in winter, mulch to keep soil moist, and drip irrigation for steady water. They also control growth by pruning, staking, thinning and balanced fertiliser.

Breeding and propagation

Propagation means making new plants. Most vegetables come from seeds. Some use cuttings (sweet potato vines), tubers (potato pieces with an eye), division or grafting (joining a good top to a strong root, used for tomato and brinjal). Tissue culture grows many clean plants in a lab.

Breeding selects plants with good traits such as taste, yield and disease resistance. A hybrid is made by crossing two parent lines; its first generation is strong and even.

Try it

Soak 10 bean or pea seeds overnight. Plant five in a cup kept in a warm spot and five in a cup kept in a cooler spot. Measure the sprouts for a week. Predict first which cup wins, then check. Compare with the temperature slider in the 3D.

Key formulas and definitions

Worked examples

1. Classify: carrot, spinach, cauliflower, peas, tomato, potato.

Carrot is a root; spinach is a leaf; cauliflower is a flower; peas are seeds; tomato is a fruit; potato is an underground stem.

2. A farmer wants spinach in summer, but 38 degrees stresses it. Give two ways to help.

Use a shade net to lower heat and light, and use mulch plus drip irrigation to keep roots cool and moist. Or choose a heat-tolerant leafy crop.

3. Why is a farmer advised to buy new hybrid seed each year instead of saving seed?

The strong, even traits of a hybrid show in the first generation. Seed saved from it mixes the parent traits again, so plants vary and yield drops.

Common mistakes

Practice quiz

1. Carrot is which type of vegetable?
2. Potato is an underground:
3. Growing a good top on a strong root is called:
4. Which helps keep soil moist and cool?
5. Too much heat usually makes a plant:

Practice: answer these yourself

Type or choose your answer, then press Check. Use a hint if you are stuck; the full solution appears after you answer.

Frequently asked questions

How are vegetables classified?

The simplest way is by the part we eat: leaf, stem, root, flower, fruit or seed vegetables. They can also be grouped by season: cool-season or warm-season.

Which temperature is best for vegetables?

It depends on the crop. Many leafy and root crops like about 15 to 25 degrees; many fruit vegetables like 20 to 30 degrees.

What is a hybrid vegetable?

A plant made by crossing two selected parents so that the first generation is strong and uniform. Seed is usually bought fresh each year.

Where this is taught

Japan高校（専門学科）1〜3年Vegetables

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