krit.club logo

Plants are living things - Plants need water and right temperature

Grade 3Cambridge (IGCSE)

Review the key concepts, formulae, and examples before starting your quiz.

🔑Concepts

•

Plants are living things that need specific conditions to grow, stay healthy, and survive.

•

Water is essential for plants. It helps them stay upright (not wilt), moves nutrients from the soil to the leaves, and is used to make food.

•

When a plant does not get enough water, it loses its firmness and begins to wilt.

•

Temperature refers to how hot or cold the environment is. Most plants grow best in 'warm' temperatures, typically between 15∘C15^{\circ}\text{C} and 30∘C30^{\circ}\text{C}.

•

If the temperature is too cold (near 0∘C0^{\circ}\text{C}), plant growth slows down or stops. If it is too hot (above 40∘C40^{\circ}\text{C}), the plant may dry out and die.

•

Seeds require a 'right temperature' to begin growing, a process called germination.

📐Formulae

Healthy Plant=Water+Right Temperature+Light+Air\text{Healthy Plant} = \text{Water} + \text{Right Temperature} + \text{Light} + \text{Air}

Lack of Water→Wilting\text{Lack of Water} \rightarrow \text{Wilting}

Extreme Cold<0∘C→Frozen/Dormant\text{Extreme Cold} < 0^{\circ}\text{C} \rightarrow \text{Frozen/Dormant}

💡Examples

Problem 1:

Ali has two identical potted plants. He gives Plant A 100 ml100\text{ ml} of water every day. He gives Plant B no water at all. Both are kept at 25∘C25^{\circ}\text{C}. What will happen to Plant B after one week?

Solution:

Plant B will begin to wilt and its leaves will turn brown or droop.

Explanation:

Plants need water to keep their stems and leaves firm. Without water, the internal pressure (turgor) drops, causing the plant to lose its shape and eventually die.

Problem 2:

A scientist places some bean seeds in a refrigerator at 4∘C4^{\circ}\text{C} and another set of seeds in a warm room at 22∘C22^{\circ}\text{C}. Which seeds are more likely to germinate (grow)?

Solution:

The seeds in the warm room at 22∘C22^{\circ}\text{C}.

Explanation:

Germination requires the 'right temperature' to trigger the growth process inside the seed. 4∘C4^{\circ}\text{C} is too cold for most bean seeds to start growing; they remain dormant until it gets warmer.