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Plant Nutrients and Growth

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Plant Nutrients and Growth

Plant Nutrients and Growth

Plant with healthy green leaves showing proper nutrition

🌱 Part 1: Essential Plant Nutrients

1. Which four macronutrients are essential for optimum plant growth? Circle all correct answers:

Nitrates

Phosphates

Potassium

Magnesium

Sodium

Iron

2. What is the main function of nitrates in plants?

Energy transfer and root development

Formation of amino acids and proteins for leaf growth

Central component of chlorophyll

Enzyme activation and disease resistance

3. Match each nutrient with its primary function in plants:
1. Phosphates
2. Potassium
3. Magnesium
4. Nitrates
A. Central atom in chlorophyll for photosynthesis
B. Protein synthesis and leaf growth
C. Energy transfer and root development
D. Enzyme activation and disease resistance

🔬 Part 2: Nutrient Deficiency Symptoms

4. Complete the sentences about nutrient deficiency symptoms:

Plants lacking sufficient nitrates will show _____________ leaves and poor _____________ growth.

A deficiency in magnesium causes leaves to turn _____________ because chlorophyll production is affected.

Without enough phosphates, plants develop weak _____________ systems and poor _____________ transfer.

Insufficient potassium makes plants more susceptible to _____________ and reduces their ability to activate _____________.

5. Why do gardeners and farmers add fertilisers to soil? Explain in your own words:

🧪 Part 3: Practical Investigation Planning

6. You are designing an experiment to test the effect of nitrate deficiency on cress seed growth. Complete the experimental design:

Hypothesis: If cress seeds are grown without nitrates, then _________________________________

________________________________________________________________

Independent variable: ___________________________________________

Dependent variable: ____________________________________________

Three controlled variables:

1. ________________________________________________________________

2. ________________________________________________________________

3. ________________________________________________________________

7. What type of data would you collect to measure plant growth? Tick all appropriate methods:

Plant height (cm)

Number of leaves

Leaf colour observations

Root length (cm)

Plant mass (g)

Soil temperature (°C)

📊 Part 4: Data Interpretation

8. The graph below shows plant height data from a nutrient experiment. Analyse the results:

Imagine a bar chart showing: Complete nutrient solution (15cm), No nitrates (8cm), No phosphates (10cm), No potassium (12cm), No magnesium (9cm)

9. Based on the imaginary data above, which nutrient deficiency had the greatest impact on plant height?
10. Explain why accurate measurement and controlled variables are important in plant nutrition experiments:

🌍 Part 5: Applied Science Connections

11. How can understanding plant nutrition help farmers increase food production sustainably?
12. Research task: Name two common fertilisers and list their main nutrient components:

Fertiliser 1: ________________________

Main nutrients: ________________________________________________

Fertiliser 2: ________________________

Main nutrients: ________________________________________________

13. True or False? Circle the correct answer for each statement:

Plants can survive without any nutrients from soil. TRUE / FALSE

Micronutrients are needed in smaller quantities than macronutrients. TRUE / FALSE

All plants require exactly the same nutrient concentrations. TRUE / FALSE

Nutrient deficiencies always kill plants immediately. TRUE / FALSE

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