DoAssignment study guide

F1.2 · Evaluate Canadian technologies for feeding growing populations

Learn to evaluate canadian technologies for feeding growing populations through clear examples and targeted practice.

Ontario Grade 12 Biology

Population Dynamics

A biology-based framework for weighing food production, environmental effects, and access

A technology may produce more food, use less land, or make production more reliable. It may also require substantial energy, equipment, or investment. For example, a greenhouse can extend the growing season in a Canadian climate, but heating it can use energy. Deciding whether it helps feed a growing population therefore requires more than asking how much food it produces. In this lesson, you will use biological knowledge and evidence to evaluate technologies in context. Evaluation means making a reasoned judgment by considering benefits, costs, and limits.

What you will learn

Explain how food technologies can affect crop or animal production.
Use ecological and biological ideas from SBI3U to identify possible benefits and costs.
Compare technologies using evidence rather than relying on a single claim.
Reach a qualified conclusion about whether a technology can help feed a growing population.

1. SBI3U bridge: food production is part of an ecosystem

In SBI3U ecology, you studied how organisms depend on resources and how energy moves through ecosystems. A crop needs light, water, nutrients, space, and suitable conditions to grow. Farm animals depend on food, water, and suitable care. These needs place limits on production.

A technology changes part of this system. Irrigation supplies water to crops. A greenhouse changes the growing environment. A storage or monitoring system can help protect food or support decisions about when to water. The technology does not remove every limit. Its effect depends on the crop or animal, local conditions, and how the system is managed.

Keep two outcomes distinct. Food production is the amount produced. Food security concerns whether people can obtain suitable food. A technology might raise production without making food affordable or available to every community. F1.2 asks you to evaluate technologies for feeding growing populations, so consider both production and the route from production to people.

Technologies affect biological systems by changing conditions or resource use.
More production does not automatically mean better access to food.
The effect of a technology depends on where and how it is used.

2. A system model: inputs, processes, and outcomes

A useful starting model has three parts. Inputs are resources or materials that enter a food-production system. Processes are the biological and practical activities that use those inputs. Outcomes include the amount and type of food produced, along with resource use and effects that may matter beyond the farm.

For a greenhouse, inputs can include seeds, water, nutrients, energy, and labour. Plants use light, water, and nutrients to grow. The greenhouse can help maintain growing conditions when outdoor conditions are unsuitable. The resulting food may be produced during a longer season, but heating, lighting, construction, or water use may also matter. These are questions to investigate, not outcomes that should be assumed in advance.

A technology can also affect organisms beyond the crop. For example, changing water or nutrient use may affect nearby environments if resources are not managed well. This is an ecological connection: organisms and their surroundings interact. Evaluation should ask what is measured, over what time period, and compared with which alternative.

Use the following model to organize questions. It is not a formula that predicts a result. It reminds you to examine the whole system rather than one attractive feature.

Inputs \rightarrow Processes \rightarrow Outcomes

Identify inputs, the production process, and several outcomes.
Compare the technology with a realistic alternative.
Separate measured results from possible effects that still need evidence.

3. Evidence and fair comparison

A claim such as “this technology saves water” needs evidence. Ask how water use was measured, what system it was compared with, and whether both systems produced a similar amount and type of food. A comparison is more useful when it reports both food output and resource use. A total water figure alone may not tell you how much food was produced with that water.

A fair comparison also considers location and time. Results from one crop, season, or region may not apply to another. Canadian farms and communities face different climates, growing seasons, infrastructure, and access to resources. A finding from one setting is evidence for that setting, not proof that the same technology will work equally well everywhere.

Look for the source and quality of evidence. A measured field comparison can tell you what happened under its conditions. A company claim may point to a possibility, but it should not replace independent evidence. A model or projection can help explore a question, but it is not the same as observing a real farm. State uncertainty clearly: explain what is known and what remains unknown.

A compact evaluation can ask about food output, resource use, environmental effects, cost and access, and suitability for the intended place. These criteria help structure judgment. They do not have to receive equal weight in every decision. Explain which criteria matter most and why.

Compare similar systems and report the conditions of the comparison.
Check whether evidence is measured, projected, or claimed.
Acknowledge uncertainty and limits before drawing a conclusion.

4. From evidence to a qualified decision

There is rarely one technology that solves every food challenge. A technology can be promising for a particular crop or location while being unsuitable elsewhere. A strong evaluation links evidence to a conclusion: it names the benefit, considers costs or trade-offs, and sets out the conditions under which the judgment applies.

A trade-off is a gain in one area that may come with a cost in another. A greenhouse might support production in a longer season, while energy needs affect its overall value. Irrigation might support crop growth where water is available, while water demand could be a concern in places with limited supply. These examples identify questions for evaluation; they do not establish that one technology is always better.

Keep the population question in view. A technology can help increase or stabilize food production, but feeding more people also depends on whether food reaches them. Consider distribution and affordability when evidence is available. Avoid claiming that a production technology alone will end hunger or guarantee food security.

State a conclusion that fits the evidence and its limits.
Explain trade-offs instead of treating a technology as wholly good or bad.
Connect production to access when judging contribution to feeding people.

Questions for evaluating a food-production technology

Criterion	Question to ask
Food production	What food is produced, and how much?
Resources	What water, energy, materials, or land are used?
Environmental effects	What effects are measured or reasonably expected, and what evidence supports them?
Cost and access	Who can use the technology, and can the food reach people?
Fit and uncertainty	Which crop, place, and conditions does the evidence cover?

Worked example

Example 1: Does greenhouse growing help in a Canadian setting?

A community is considering a greenhouse to produce vegetables for a longer part of the year. What should its biology class examine before recommending the project?

Name the system
Identify the crop, location, season, and current alternative. The comparison might be with outdoor production or with vegetables brought from another region. The alternative matters because a technology can only be judged against a clear reference.
List biological needs and inputs
Plants need light, water, and nutrients to grow. Ask how the greenhouse provides suitable conditions and what energy, water, materials, and labour it requires. These inputs help reveal both how the system could work and what it may cost.
Request relevant evidence
Look for measured information about the amount of vegetables produced, the period of production, and resource use. Check the crop and location in the evidence. A result for a different crop or climate may not transfer directly.
Make a conditional judgment
The greenhouse may help provide vegetables over a longer season if its production and resource needs suit the community. Without evidence about output, energy, costs, and access, a firm recommendation would be premature.

Answer: Treat the greenhouse as a possible way to extend production, not as an automatic solution. Recommend it only if local evidence supports its production benefits and the community can manage its resource and access needs.

Check: The conclusion names a possible benefit while identifying evidence still needed.

Worked example

Example 2: Comparing two irrigation approaches

A farm compares two ways of supplying water to the same crop. In one season, Approach A uses 120 units of water and produces 600 units of crop. Approach B uses 90 units of water and produces 450 units of crop. These are invented classroom values, not reported farm data. Which approach used less water per unit of crop in this comparison, and what can the result support?

Calculate water per crop unit
Divide water used by crop produced for each approach. This makes the comparison relative to output, rather than comparing water totals alone.
Compare the results
Approach A uses 0.20 water units per crop unit. Approach B uses the same amount per crop unit. Although B uses less water in total, it also produces less crop, so the values do not show lower water use per unit of crop.
Limit the conclusion
The calculation describes only these invented values for one season. It does not show whether either approach is better across other seasons, crops, or locations. A recommendation would also need evidence about practical costs, environmental effects, and food access.

Answer: Neither approach used less water per crop unit in this comparison. Both used 0.20 water units per crop unit. The result does not establish which approach is preferable overall.

Check: The units in the division are water units divided by crop units, so the comparison accounts for different production amounts.

Worked example

Example 3: Weighing a monitoring technology

A farm is considering a device that monitors growing conditions and helps workers decide when to water. The supplier says it could reduce unnecessary watering. What evidence and reasoning would support a careful evaluation?

Turn the claim into a testable comparison
Compare use of the device with the farm’s usual approach under similar crop and growing conditions. Record water use and crop production. If conditions differ greatly between the comparisons, it may be difficult to tell whether the device made the difference.
Check more than the supplier's claim
Ask for measured results and details about where and how they were obtained. Consider whether the device can be used by the farm, what it costs to install and operate, and whether workers can act on the information it provides.
Balance possible benefit and limitation
If a fair comparison shows less water use while maintaining suitable crop production, that would support a benefit in that setting. The result would not prove the device works equally well for every crop or farm.

Answer: The device is worth considering if suitable evidence shows that it reduces unnecessary water use without undermining production, and if its costs and use fit the farm. The supplier's statement alone is not enough to establish these points.

Check: A careful evaluation tests the claim against a comparison and limits its conclusion to the conditions studied.

Common mistakes and how to avoid them

Assuming that higher production automatically means the technology feeds more people.

Correction: Consider whether the food is accessible and affordable, as well as how much is produced.

Comparing total resource use without considering how much food each system produces.

Correction: When useful, compare resource use relative to production and state the units.

Treating one farm's result as proof that a technology will work everywhere in Canada.

Correction: Check the crop, location, season, and conditions. Keep the conclusion within the evidence.

Repeating a supplier's claim as though it were an independent result.

Correction: Look for measured comparisons and explain who produced the evidence and what it covers.

Lesson summary

Food technologies change inputs or conditions in biological production systems.
Evaluate production alongside resource use, environmental effects, cost, access, and local suitability.
Use fair comparisons and distinguish measured evidence from claims or projections.
Make a qualified judgment that states both the possible benefit and the limits of the evidence.

Check your understanding

Question 1

A technology produces more crop in one trial, but the trial does not report water use or cost. Which conclusion is best supported?

The technology is the best option for every Canadian farm.
The technology produced more crop in that trial, but further evidence is needed to judge its overall value.
The technology guarantees that more people will have affordable food.
The technology has no environmental effects.

Show answer and explanation

The technology produced more crop in that trial, but further evidence is needed to judge its overall value.

The trial supports a limited statement about crop production under its conditions. It does not establish resource use, cost, access, or effects elsewhere.

Question 2

Why might a comparison of water totals alone be misleading when two systems produce different amounts of crop?

Water use should never be measured.
The system producing less crop must always be more efficient.
The comparison does not show how much water was used relative to the food produced.
Crop production cannot be compared between systems.

Show answer and explanation

The comparison does not show how much water was used relative to the food produced.

A relative measure can show water use per amount of crop. Total water use alone does not account for different production amounts.

Question 3

Which statement is the most careful evaluation of a new monitoring device?

It must work because a supplier says it saves water.
It cannot help because farms already produce food.
It may help if a fair local comparison supports the claim and its costs and limits are manageable.
It will solve food insecurity wherever it is installed.

Show answer and explanation

It may help if a fair local comparison supports the claim and its costs and limits are manageable.

This conclusion identifies a possible benefit, requires relevant evidence, and recognizes that usefulness depends on local conditions and costs.

Key terms

Food production: The amount and type of food produced by a system.
Food security: Whether people can obtain suitable food.
Input: A resource or material used by a production system.
Trade-off: A gain in one area that may come with a cost in another.
Evidence: Information used to support or challenge a claim.

Continue through SBI4U

View the complete SBI4U Ontario Grade 12 Biology curriculum and lessons

About this lesson and its review

Published by DoAssignment. This reviewed lesson follows Ontario Grade 12 Biology (SBI4U), expectation F1.2. It is a study resource, not an official curriculum publication.

Before publication, content is checked for structure, mathematical or chemical notation, calculations, course boundaries, and readability. Errors can still occur, so corrections are welcomed.

Official curriculum reference

Report a correction or ask a question