Question 1 of 10
The relationship between a bee and a flower is an example of:
Apredation
Bmutualism
Ccommensalism
Dparasitism
Explanation
📌 Mutualism: both benefit. Bee gets nectar (food), flower gets pollinated.
Parasitism: one benefits, other harmed. Commensalism: one benefits, other unaffected.
Parasitism: one benefits, other harmed. Commensalism: one benefits, other unaffected.
Question 2 of 10
In the food chain: Grass → Cricket → Frog → Snake → Hawk, which organism is a tertiary consumer?
AHawk
BSnake
CFrog
DCricket
Explanation
📌 Trophic levels:
Grass = Producer
Cricket = Primary consumer (1°) — eats plants
Frog = Secondary consumer (2°) — eats primary consumer
Snake = Tertiary consumer (3°) — eats secondary consumer
Hawk = Quaternary consumer (4°)
Grass = Producer
Cricket = Primary consumer (1°) — eats plants
Frog = Secondary consumer (2°) — eats primary consumer
Snake = Tertiary consumer (3°) — eats secondary consumer
Hawk = Quaternary consumer (4°)
Question 3 of 10
Which process in the water cycle is shown by arrow X?
AEvaporation
BCondensation
CPrecipitation
DRunoff
Explanation
📌 Arrow X shows water rising from the surface to the clouds → Evaporation
Evaporation = liquid water → water vapor (gas) due to heat from the sun.
Complete cycle: Evaporation → Condensation (clouds form) → Precipitation (rain) → Runoff → Collection
Evaporation = liquid water → water vapor (gas) due to heat from the sun.
Complete cycle: Evaporation → Condensation (clouds form) → Precipitation (rain) → Runoff → Collection
Question 4 of 10
Natural selection can BEST be described as:
AEvery organism in a population has an equal chance of surviving and breeding
BOrganisms changing their DNA intentionally
COrganisms choosing their mates
DOrganisms with favorable traits surviving and reproducing more
Explanation
📌 Natural selection = organisms with favorable traits survive and reproduce more, passing those traits to offspring. 'Survival of the fittest.'
Question 5 of 10
In an energy pyramid, which level has the MOST energy?
APrimary consumers
BSecondary consumers
CTertiary consumers
DProducers
Explanation
📌 Producers (bottom level) have the most energy. Only ~10% transfers to each higher level. This is the 10% rule.
Question 6 of 10
In a food chain, which organism is the primary consumer?
AFox
BRabbit
CGrass
DEagle
Explanation
📌 Primary consumer = herbivore = eats producers (plants).
Producers → Primary consumers → Secondary consumers → Tertiary consumers
Producers → Primary consumers → Secondary consumers → Tertiary consumers
Question 7 of 10
Which of the following is a biotic factor?
AWater
BTemperature
CBacteria
DSunlight
Explanation
📌 Biotic = living things (plants, animals, bacteria).
Abiotic = non-living (temperature, water, sunlight, soil).
Abiotic = non-living (temperature, water, sunlight, soil).
Question 8 of 10
Use the Punnett square to determine the probability of offspring with the homozygous recessive (aa) genotype.
A0
B1/4 (25%)
C1/2 (50%)
D3/4 (75%)
Explanation
Aa × Aa cross: AA, Aa, Aa, aa. Only one box (aa) shows the homozygous recessive: 1/4 = 25%.
Question 9 of 10
In the food web below, what would happen if all the frogs were removed?
AThe whole food web stays exactly the same and nothing changes at all
BInsect population increases and snake population decreases
CSnake population increases
DEvery organism in the entire food web quickly dies off completely
Explanation
📌 If frogs are removed:
• Insects (grasshoppers) they ate would INCREASE (no predator)
• Snakes that ate frogs would DECREASE (less food)
• This demonstrates how removing one species affects the entire food web. Snakes lose a food source so they cannot increase, the web does not stay unchanged, and it does not wipe out every organism.
• Insects (grasshoppers) they ate would INCREASE (no predator)
• Snakes that ate frogs would DECREASE (less food)
• This demonstrates how removing one species affects the entire food web. Snakes lose a food source so they cannot increase, the web does not stay unchanged, and it does not wipe out every organism.
Question 10 of 10
For AA × aa, what is the genotype of all offspring?
AAll Aa
BAll AA
C1 AA : 2 Aa : 1 aa
DAll aa
Explanation
Each parent contributes a different homozygous allele → 100% Aa heterozygous.