Ok I need help with Science 10 1) The Concentration of a toxic pesticide is magn

Question

Ok I need help with Science 10

1) The Concentration of a toxic pesticide is magnified 10 times at each trophic level. What will be it's concentration in organgisms at the fouth trophic level if producerse store the pesticide at concentrations of 60 ppm?

a) 09ppm

b)600ppm

c)6000ppm

d)60 000ppm

Also when you doo #1, could you explain to me how you did it? Thanks guys

2) Foxes and owls living in the same habititat compete for rabbits as their food supply. Which of the following situations would lead to the greatest problem in their food supply

a)A decrease in the fox population

b) an increase in the fox population

c)a decrease in the owl population

d) an increase in the rabbit population

the answer to #1 is b, but could you guys explain me how?

3) What do you call the interactions of all living organisms with the non-living factors in a given area?
a) Photosynthesis

b) An environment

c)Abiotic factors

d) An ecosystem

4) Which act represent a sustainable ecosytem?

a)Declaring an area as a National Park in which hunting, fishing and logging is totally banned

b) Increasing level of hunting, fishing and logged to meet the needs of increasing populations

c) Managing resources to meet the needs of present generations while at the same time taking into account the needs of future generations

d) Take all the resources we need to meet the needs of current population and make a few dollars.

5: Which natural resource is non-renewable?

a) Fish

b) Forests

c) Oil

d) All of the above

6: Which statement is False?

a) populations compete for food, shelter and water

b) The biodiversity of an area can contribute to sustainability

c) A single population could not survive without some type of interaction with other populations

d) Monioculture populations contribute to biodiversity

7: Which statement is true regarding denitrification by bacteria?

a) Denitrifying bacteria grow best in soil that has been aerated

b) It occurs in oxygen rich soils

c) They provide more nutrients for plants

d) They consume nitrates in the soil and return nitrogen gas back to the atmosphere

8: The process of photosynthesis is described as

a) Caron Dioxide + Oxygen > Sugar + Water

b) Carbon Dioxide + sugar > Oxygen + Water

c) Carbon Dioxide + Water > Sugar + Oxygen

d) Sugar + Oxygen > Carbon Dioxide + Water

9: Which of the following best defines an ecosystem?

a) All the interactions between living things in a biome

b)All the interactions between non-living things in a biome

c) All interactions between trophic levels in a biome.

d) All of the interactions between living things and their environement in a biome

10: The carbon cycle is best responsible for

a) Rain

b) Respiration and Photosynthesis

c) Production of nitrates for plant and animal growth

d) Organic material decomposing and returning to the soil

11: The nitrogen cycle is most likely to contain which substances

a)CO; CO2; NA2CO3

b) C6H12O6 ; CO2; H2O

c) N2; NH3; NO3

d) H2O Vapour; Liquid H2O; CO2

12: Over four months, the elk population decrease by half of its original size. Which statement below best explains this change in elk population?

a) There is an increase in the population of the elk's predators

b)There was a sever drought

c) The elk population reached the carrying capacity of the region

d) All of the above are possible explanations

13: Extinction of a species

a) Has a positive impact on biodiversity

b) Can ural phenomenon like severe drought over many years

c) is due to human impact only

d) is never affected by human settlements

Thanks so much guys, greatly appreciate it.

Explanation / Answer

my answer is 1)C 2)A 3)A 4)C 5)D 6)B 7)A 8)C 9)B 10)C 11)D 12)C 13)B

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