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B4: Quiz 5 – Answers
B4: Quiz 5 – Answers
1) Any 3 from:
Your answers do not have to be as long as the ones below
2) When plants are grown in the optimal conditions, the crop yields are higher, which means that the farmer will make more money when selling the crops to market. The increase in money that the farmer will make from controlling the conditions will usually be greater than the increase in cost to control the conditions, which means that the farmer will make a greater profit. This is why farmers are willing to control these conditions
Your answers do not have to be as long as the ones below
- Temperature – a greenhouse traps the suns heat, which results in the temperature inside the greenhouse being higher than the temperature outside the greenhouse. This increases the rate of photosynthesis and ensures that temperature is not a limiting factor. In winter, gardeners may have heaters that increase the temperature of the greenhouse. Also, in the summer, the temperature inside the greenhouse may become too high and this could cause the enzymes in the plants to denature, which would result in the rate of photosynthesis falling. In order to ensure that the temperature inside greenhouses does not get too high, the farmer/ gardener will open windows and doors, which will bring in new air thus causing the temperature of the greenhouse to decrease.
- Light – commercial farmers may use artificial lights at night or during the evenings to increase the light intensity and therefore increase the rate of photosynthesis. It is only really commercial farmers that use artificial lights rather than amateur gardeners because the lights are expensive to purchase and run.
- Concentration of carbon dioxide – some farmers will increase the concentrations of carbon dioxide by using paraffin heaters. The burning of the paraffin produces carbon dioxide, which increases the concentration of carbon dioxide in the greenhouse. Carbon dioxide is one of the reactants in photosynthesis, so an increase in carbon dioxide increases the rate of photosynthesis if the concentration of carbon dioxide was the limiting factor. The burning of the paraffin also produces heat, which increases the temperature in the greenhouse.
- Water – plants are watered regularly to ensure that they have sufficient water. Also, the plants are not overwatered because too much water kills the plants because the roots will not be able to take in enough oxygen to be able to function properly.
- Pest control – a greenhouse keeps all of the plants enclosed, which means that fewer or no pests will enter the greenhouse. This means that fewer plants are eaten or lost to diseases, which increases the yield and profit for farmers.
- Minerals – farmers will usually fertilise the soil that the plants are growing in. They will usually use a fertiliser that contains nitrates or phosphates. Spreading fertilisers on the soil ensures that the plants have the necessary minerals for healthy growth.
2) When plants are grown in the optimal conditions, the crop yields are higher, which means that the farmer will make more money when selling the crops to market. The increase in money that the farmer will make from controlling the conditions will usually be greater than the increase in cost to control the conditions, which means that the farmer will make a greater profit. This is why farmers are willing to control these conditions
Questions
1) Give and explain 3 conditions that farmers can control to ensure that crop yields are as high as possible.
2) Controlling these conditions is expensive. Why are farmers willing to pay to control these conditions?
1) Give and explain 3 conditions that farmers can control to ensure that crop yields are as high as possible.
2) Controlling these conditions is expensive. Why are farmers willing to pay to control these conditions?