Year 7 Science · Unit 1 · Lesson 15
Foundation Worksheet
Learning Goals
True or False? Fix the false ones
Circle T or F for each statement. If the statement is false, rewrite it correctly on the line below.
1. In mutualism, both organisms benefit from the relationship.
Correct it:
2. Parasites always kill their host quickly to get the most nutrients.
Correct it:
3. Intraspecific competition is competition between two different species fighting over the same resource.
Correct it:
4. When prey populations crash, predator populations eventually crash too because their food source is gone.
Correct it:
5. Commensalism means one organism benefits from the relationship while the other organism is harmed.
Correct it:
Fill the gap
Choose the correct word from the word bank to complete the passage. Each word may only be used once. Two words in the bank are not needed.
Symbiosis describes a close, long-term relationship between two species. In , both species — for example, bees collect nectar from flowers and carry pollen at the same time, helping the flower reproduce. In , only one species benefits while the other is — barnacles attach to a whale's skin and are carried through nutrient-rich water, but the whale does not notice. In , one species benefits by feeding on or living inside a , causing that organism — a tapeworm living inside a human body is a well-known example.
1. Name one example of mutualism and explain how each organism benefits from the relationship.
2. In the lynx and snowshoe hare predator-prey cycle, why do lynx numbers start to fall after hare numbers have already fallen — not at the same time?
Wrap Up
In one sentence, what was the main idea of this lesson?