Plan an investigation that learners should conduct in the form of worksheet. Yhe worksheet should include the following:

Question

Apparatus that will be used
Conducting the experiment
Controlling variables
Recording of results
Replication of result

Answer 1

Title: Investigating the Effect of Fertilizer on Plant Growth

Objective: To determine the impact of different types of fertilizers on the growth of plants.

Apparatus:
1. Four identical potted plants
2. Three different types of fertilizers (e.g., organic fertilizer, chemical fertilizer, no fertilizer)
3. Measuring tape or ruler
4. Watering can or spray bottle
5. Notebook or worksheet for recording observations and data

Conducting the Experiment:
1. Start by labeling each potted plant as A, B, C, and D.
2. Determine the amount of each fertilizer to be used. Follow the instructions provided on the packaging for each type of fertilizer.
3. For Plant A, use organic fertilizer according to the specified amounts. For Plant B, use chemical fertilizer according to the specified amounts. For Plant C, do not use any fertilizer, only water the plant normally. Plant D will be the control plant with no fertilizer and regular watering.
4. Water the plants simultaneously using the same amount of water each day.
5. Place the plants in a well-lit area such as near a window or under a grow light.
6. Ensure that the room temperature and lighting conditions remain consistent throughout the investigation.
7. Water the plants regularly, keeping the soil moist but not overly saturated.
8. Monitor and record the growth of the plants daily or weekly for a set period of time (e.g., four weeks). Observe changes in height, number of leaves, color, etc.
9. Take photographs or draw sketches to document the plant's growth and appearance for a visual representation of the data.

Controlling Variables:
1. Ensure that all plants are the same species and similar in size, preferably from the same seed batch.
2. Use the same size pots and potting soil for all plants.
3. Water all plants using the same volume of water each day.
4. Maintain consistent lighting conditions and room temperature.
5. Position the plants equidistant from each other to receive equal amounts of light.

Recording of Results:
Record observations and data in a table or on a worksheet. Include the following details:
- Plant label (A, B, C, D)
- Date of observation
- Height of the plant (cm/inches)
- Number of leaves
- Color of leaves
- Overall appearance

Replication of Results:
To ensure the reliability of the investigation, the experiment should be conducted multiple times, preferably with a larger sample size. Replicating the investigation helps to determine if the results are consistent and reliable. It is recommended to repeat the experiment at least three times using different sets of identical plants. Record observations and data for each replication separately.

Note: The investigation can be modified or expanded to explore additional factors such as different types of plants or varying amounts of fertilizers.