6Th Grade Science 3Rd Benchmark Study Guideperiod: ______

Name: KEYDate: ______

6th Grade Science – 3rd Benchmark Study GuidePeriod: ______

1. What is the difference between a community and a population? A community is all of the species in the same area at the same time while a population is one of the species in the same area at the same time
2. Behaviors help animals do what? Either survive or reproduce
3. What is the purpose of building a nest? Have a place to lay eggs and keep them warm , a place to raise young and keep them safe from predators
4. Define pollination: the transfer of pollen from male reproductive part, (anther) to female reproductive part (stigma)
5. What attracts pollinators to flowers? Bright colored petals, sweet nectar, ETC.
6. Define abiotic factor and give an example : non-living; rock, water, air
7. Define biotic factor and give an example: living or once living; animals, plants, bacteria
8. Define niche: the way, job or role an organism interacts within its ecosystem to get food, shelter, and other needs to survive
9. CIRCLE the NICHE of the following organisms:

Catfish: “bottom feeder “or feeds off the surface of a pond

Bear: OMNIVORE! (MEAT & BERRIES --- OOPS NO OPTION FOR THAT!)

Bees: decomposeror pollinator

Birds: Live in forestsorbuild nests in trees

1. Define competition: occurs between organisms when resources are limited
2. Describe the relationship between the predator and the prey: predators hunt and eat prey; prey are the victims – prey cannot be a producer – occurs between two animals
3. Define producer: produce their own energy from sunlight – plants
4. Define decomposer: break down dead organisms and recycle matter in ecosystem
5. Define carnivore: eat other animals (consumers) to obtain energy
6. Define omnivore: eat animals (consumers)& plants (producers) to obtain energy
7. Define herbivore: eat plants (producers) to obtain energy

1. Explain the change in prey population size when predator population size increases prey population size will decrease because they will be eaten by the many predators

And when it decreases…. Prey population will increase because there are less predators eating prey

*NUMBERS 18-22 WERE REPEATS!

1. Define overpopulation and what does it lead to?: overpopulation is when a species within an area exceeds the carrying capacity of that habitat – it leads to spread of disease, damage to the ecosystem, and competition to resources
2. Define parasitism: one organism benefits, other is harmed
3. Define mutualism: both organisms benefit
4. Define commensalism: one organism benefits, the other not harmed nor benefitting
5. What would happen when the predators are removed from a food web? The food level below it will overpopulate (increase) and possibly cause its food source to decrease
6. What is the difference between a food web and a food chain? Food chain show the simple flow of energy from producer to decomposer – while food web show the many interconnecting food chains within an ecosystem *KNOW WHAT BOTH LOOK LIKE*
7. The force of gravity depends on mass and distance
8. Weight changes because of gravity. Does mass change? No the amount of matter in an object or substance never changes
9. Define friction: the force that one surface exerts on another when they rub against one another
10. Define sliding friction: one surface moves over another
11. Define static friction: when an object is not moving
12. Define fluid friction : involves friction with air or liquid
13. Define net force: the combination of all forces exerted on an object – add forces moving in the same direction, subtract forces moving in opposite directions
14. How do you determine if a force is balanced or unbalanced? A force is balanced when its net force equals to 0 N. A force is unbalanced when it is greater than 0 N.