Plant Nutrition Quiz 13th

What do plants mainly get from the soil through their roots?

• Water

• Sunshine

• Nutrients

• Air

Which of the following is NOT a nutrient that plants need to grow?

• Nitrogen

• Phosphorus

• Sunshine

• Water

Why might soil not have enough nutrients for plants?

• The soil is bad

• There has been a lot of rain washing away the nutrients

• The plants don’t have roots

• Both a and b

What is fertilizer compared to in the reading?

• Extra sunshine

• A special food for plants

• A type of water

• A kind of air

Why do farmers often put down more fertilizer than they need?

• Because fertilizer is cheap

• Because the soil is the same everywhere

• Because it’s hard to know exactly how much fertilizer a field needs

• Because fertilizer is always good for plants

What happens to extra fertilizer that gets washed away by rain or irrigation?

What is an “algal bloom”?

• When algae grow really fast and cover the water

• When algae die and sink to the bottom

• When algae disappear from the water

• When algae produce oxygen

Why can an algal bloom be harmful to lakes and oceans?

• It increases the amount of sunlight that reaches the plants at the bottom

• It decreases the amount of oxygen in the water

• It makes the water cleaner

• It helps fish grow faster

What is eutrophication?

• The process of plants growing too much and then dying

• The process of adding nutrients to the soil

• The process of water running out of oxygen due to too many nutrients

• The process of algae producing food for fish

How can cutting down too many trees contribute to eutrophication?

• Trees produce too much fertilizer

• Trees keep the nutrients in the soil

• Trees block the sunlight

• Trees absorb all the oxygen in the water