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Plants are living things - Questions

Grade 3Cambridge (IGCSE)

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

🔑Concepts

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The Roots: They anchor the plant in the soil and absorb water and minerals. They act like straws to suck up nutrients from the ground.

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The Stem: It supports the plant, holding up the leaves and flowers. It also transports water from the roots to the rest of the plant.

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The Leaves: These are the 'food factories' of the plant. They capture sunlight to turn water and air into energy (food).

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The Flower: This is the reproductive part of the plant. It produces seeds so that new plants can grow.

📐Formulae

Sunlight+Water+Carbon Dioxide(CO2)→Food (Glucose)+Oxygen(O2)\text{Sunlight} + \text{Water} + \text{Carbon Dioxide} (CO_2) \rightarrow \text{Food (Glucose)} + \text{Oxygen} (O_2)

Plant Needs=Water+Light+Air+Nutrients+Space\text{Plant Needs} = \text{Water} + \text{Light} + \text{Air} + \text{Nutrients} + \text{Space}

💡Examples

Problem 1:

Which part of the plant is responsible for absorbing water from the soil? A)A) Stem, B)B) Leaves, C)C) Roots, D)D) Flower.

Solution:

C)C) Roots

Explanation:

The roots grow underground and have tiny hairs that absorb water and minerals from the soil to help the plant grow.

Problem 2:

If a plant is placed in a dark cupboard for two weeks, what is likely to happen and why?

Solution:

The plant will turn yellow and eventually die.

Explanation:

Plants need light to make food through photosynthesis. Without light, the plant cannot produce the energy it needs to survive, represented by the equation: No Light=No Food\text{No Light} = \text{No Food}.

Problem 3:

True or False: All plants start their life cycle as a seed.

Solution:

True (for most flowering plants).

Explanation:

Most plants we study in Grade 3 start as a seed. When the conditions are right (Warmth, Oxygen, and Water — often remembered as W.O.W.W.O.W.), the seed germinates.

Problem 4:

A scientist measures a seedling's height. On Day 1, it is 2 cm2 \text{ cm}. On Day 10, it is 12 cm12 \text{ cm}. How much did it grow?

Solution:

12 cm−2 cm=10 cm12 \text{ cm} - 2 \text{ cm} = 10 \text{ cm}

Explanation:

Growth is a life process. We calculate the total growth by subtracting the initial height from the final height using the formula: 12−210\begin{array}{r} 12 \\ - 2 \\ \hline 10 \end{array}