Middle School Science Quiz: Traits Improve Survival

What this quiz covers

This quiz focuses on Traits Improve Survival, giving you a quick way to practice the rules, question types, and explanations that matter most for Middle School Science.

How to use this quiz

Try each quiz question before looking at the correct answer. Use the explanations to review missed ideas, then come back to similar questions until the pattern feels familiar.

Question 1

1. Non-waxy leaves are the best trait because plants with that trait are more noticeable.
2. Waxy leaves are associated with higher reproduction (more plants reaching at least 10 seeds) in this dry environment. (correct answer)
3. Because the environment was dry, all plants had the same reproduction regardless of leaf trait.
4. Waxy leaves guarantee that every plant will produce at least 10 seeds.

Question 2

1. Green shell color, because green is a brighter color.
2. Brown shell color, because a larger number survived in the brown group under the same conditions. (correct answer)
3. Green shell color, because inherited traits guarantee success.
4. Neither trait matters; survival is only controlled by the forest and not by traits.

Question 3

1. Long ears are required for survival, because the long-eared group had many survivors.
2. Short ears are associated with slightly higher survival than long ears under these conditions. (correct answer)
3. Long ears are associated with higher survival because long ears look more impressive.
4. The data prove ear length does not affect survival in any environment.

Question 4

1. Thick shells guarantee higher survival in every environment because shell thickness is inherited.
2. Thick shells are associated with higher survival in the high-calcium tank, but not in the low-calcium tank, showing that a trait's effect can depend on conditions. (correct answer)
3. Thin shells are always best because they are lighter.
4. Because predators were the same in both tanks, shell traits cannot be linked to survival differences.

Question 5

1. All mice survived or died mainly because hawks were present, so coat color does not matter.
2. Dark brown coat color guarantees survival because it is an inherited trait.
3. Light tan coat color is associated with higher survival than dark brown coat color in this grassland. (correct answer)
4. The mice with dark brown coats survived more because they were stronger.

Question 6

1. Thick beaks, because a higher number of thick-beaked adults produced chicks under the same conditions. (correct answer)
2. Neither beak shape is related to reproduction because reproduction depends only on luck, not inherited traits.
3. Narrow beaks, because all individuals that reproduce must have the same trait, so variation is not needed.
4. Narrow beaks, because narrow beaks look more pointed and pointed traits lead to more reproduction.

Question 7

1. No trait is linked to reproduction because the data are averages and averages cannot be used as evidence.
2. Short antennae are associated with higher reproduction because they are shorter and shorter traits are always more efficient.
3. Long antennae will appear in every single insect in the next generation because the trait caused higher reproduction.
4. Long antennae are associated with higher reproduction in generations 2 and 3 because adults with long antennae had more offspring per adult under the same conditions. (correct answer)

Question 8

1. Waxy leaves are a good trait because wax is useful, so waxy plants must survive more.
2. The environment stayed consistent, so traits cannot be linked to survival differences.
3. The plants with waxy leaves had a higher survival fraction ($140/200$) than plants with non-waxy leaves ($80/200$) under the same conditions. (correct answer)
4. Non-waxy leaves survived less because smaller plants always die first, regardless of leaf trait.

Question 9

1. Both traits will have exactly the same survival because survival depends only on the river, not traits.
2. Striped fish are likely to have a higher survival rate than plain fish under the same conditions because striped fish had higher survival in the first 12 weeks. (correct answer)
3. Plain fish will have higher survival because the model must alternate outcomes each time period.
4. Plain fish will all die because the trait caused lower survival in the first 12 weeks.

Question 10

1. The claim cannot be evaluated using the data because trait labels do not provide any evidence about survival.
2. The claim is not supported because thick shells are associated with higher survival, but the data show that not all thick-shelled snails survived. (correct answer)
3. The claim is supported because thick shells had more survivors, so the trait guarantees survival.
4. The claim is supported because thin shells are a harmful trait, and harmful traits always disappear immediately.

Question 11

1. Ear length does not matter because some of both types survived, so the trait cannot affect survival.
2. Short ears guarantee survival because they had the higher number of survivors.
3. Long ears are associated with higher survival because long ears are larger and survival equals size.
4. Short ears are associated with higher survival in this winter environment because more short-eared rabbits survived out of the same starting number. (correct answer)

Question 12

1. Brown shell color is associated with higher survival in this environment because a larger fraction of brown beetles remained alive. (correct answer)
2. Green shell color guarantees survival because some green beetles were still alive after 6 months.
3. Survival was caused only by the environment, so shell color traits did not affect survival outcomes.
4. The beetles that were strongest survived, so shell color is not linked to survival.

Question 13

1. Long legs are associated with higher reproduction because a greater fraction of long-legged adults produced offspring under the same conditions. (correct answer)
2. Short legs are associated with higher reproduction because short legs require less energy, so they must reproduce more.
3. All long-legged lizards reproduced because long legs are a successful trait.
4. Reproduction depends only on the season, so inherited traits cannot be linked to reproductive outcomes.

Question 14

1. Pairs with deep beaks will, on average, produce more chicks than pairs with narrow beaks in the same environment. (correct answer)
2. Pairs with narrow beaks will always produce more chicks because smaller traits reproduce faster.
3. Beak shape cannot be linked to reproduction because only short-term survival counts as evidence.
4. If one deep-beak pair produced 0 chicks, then deep beaks do not affect reproduction at all.

Question 15

1. Brown fur, because mice with brown fur produced more total offspring in the same environment. (correct answer)
2. White fur, because the model means every white-fur mouse will produce more offspring than every brown-fur mouse.
3. White fur, because fur color is only an appearance and cannot affect reproduction.
4. Either fur color, because no variation in traits is needed for reproduction differences.

Question 16

1. Large insects survived more because survival mainly depends on being bigger.
2. Small insects are associated with higher survival than large insects under these constant conditions. (correct answer)
3. Because both groups were exposed to pesticide, traits do not affect survival.
4. The data show that size determines survival for every individual insect.

Question 17

1. Some inherited traits can increase survival in a particular environment, as shown by the different survival numbers.
2. The rough-toe-pad trait increased survival for every single lizard in the rough-toe-pad group. (correct answer)
3. The evidence compares groups under the same conditions, which helps link the trait to survival outcomes.
4. Rough toe pads are associated with higher survival than smooth toe pads on this rocky hillside.

Question 18

1. Light-colored skin is associated with higher survival in this desert habitat. (correct answer)
2. Dark-colored skin is associated with higher survival because darker colors are stronger.
3. The habitat alone caused survival outcomes, so inherited traits cannot affect survival.
4. Because 35 dark-skin lizards survived, the dark-skin trait guarantees survival.

Question 19

1. Both varieties will produce the same number of seeds because the field conditions are the only cause of reproduction.
2. Variety R will likely have a higher proportion of plants producing at least 20 seeds than Variety N under the same disease conditions. (correct answer)
3. All Variety R plants will produce at least 20 seeds because disease resistance guarantees reproduction.
4. Variety N will produce more seeds because it looks healthier at the start of the season.

Question 20

1. Both traits have the same survival because frogs live in the same pond, so trait differences cannot affect outcomes.
2. Smooth skin is associated with higher survival because more smooth-skinned frogs survived from the same starting number under the same conditions. (correct answer)
3. Rough skin is associated with higher survival because rough skin looks tougher and toughness determines survival.
4. Smooth skin guarantees survival because it had the higher number of survivors.