LEAP 2025/2026 Biology Practice Test
Questions and Correct Answers.
Which claim is supported by the information in Graph 1 and Graph 2? - Answer The number
of eggs and the mass of the eggs produced by sockeye Slamon depends on the amount of
matter stored by the female
Develop a model that can be used to explain the stages of growth and development that result
in a salmon fry. - Answer 1. Sperm fertilizes egg
2. Genetic material is evenly divided
3. Embryo changes from two to four cells
4. Cell differentiate
5. Specialized tissues and organs are produced
Based on the information in Graph 3, chum salmon fry are likely to eat prey that is__________
prey eaten by the pink salmon fry and______________prey eaten by the coho salmon fry. This
is because as a salmon's size increases, its matter intake needs_____________ - Answer 1.
larger than
2. smaller than
3. increase
Which statement best explains how salmon obtain and use matter to support their biological
functions? - Answer Salmon break bonds in complex food molecules to release the carbon,
oxygen, and hydrogen atoms needed for the formation of other molecules
Which claim is best supported by the information about scales and feathers? - Answer
changes in placodes over time allowed for the development of different structures
Which statement best explains what caused some theropods to develop feathers?
Which information is evidence that best supports the answer to Part A? - Answer a mutation
in DNA affected the types of proteins produced by placodes
the DNA of mdoern-day vertabrates codes for the proteins in placodes
, Which evidence best supports the claim that birds evolved from dinosaurs? - Answer the
same sequences are found in the genetic information of theropods and birds
Mammals did not descend directly from dinosaurs, but mammals embryos have placodes, as
show in Figure 3. - Answer Mammals and dinosaurs descended from a common ancestor.
This ancestor must have had placodes and passed them down through generations. Figure 2
shows that dinosaurs and mammals have a common ancestor.
Which statement best explains the results shown in Table 1? - Answer trees from site 1 grow
less rapidly than trees from ste 2 because the trees have slower rates of cellular respiration at
site 1 than at site 2
Which claim about the transfer of energy in the tonewood ecosystem is best supported by data?
- Answer more energy is available to transer from the trophic level occupied by the red deer
at lower elevations than from the same trophic level at higher elevations
Tonewood trees are most likely to be produced as a result of___________temperatures
and_____________precipitation.
Which statements are evidence that supports the answer to Part A? - Answer 1. higher-than-
average
2. lower-than-average
1. in the year with the lower-than-average precipitation, the rate of cellular respiration in trees
at both sites was lower than average
2. in the year with the above-average temperatures and average precipitation, the rate of
growth at ste 2 decreased
Scientists have noted a difference in the concentration of atmospheric gases available to
Norway spruce trees at site 1 and site 2. Use Table 1 and Figure 2 to describe the difference in
atmospheric gases at each site. Explain how the flow of matter and energy differs in these two
locations as a result of the concentration difference. Use evidence from any of the tables or
figures to support your answer. - Answer When it rains, the trees are able to get nutrients
and can quicken their photosynthesis. This produces more glucose. In table 2, you can see that
trees with more rain have a greater diameter. An increase in diameter shows that more glucose
is being created in the areas with more rainfall.
Which questions could be answered using the results of this investigation? - Answer 1. is hair
length in german sheperds a dominant or recessive trait?
Questions and Correct Answers.
Which claim is supported by the information in Graph 1 and Graph 2? - Answer The number
of eggs and the mass of the eggs produced by sockeye Slamon depends on the amount of
matter stored by the female
Develop a model that can be used to explain the stages of growth and development that result
in a salmon fry. - Answer 1. Sperm fertilizes egg
2. Genetic material is evenly divided
3. Embryo changes from two to four cells
4. Cell differentiate
5. Specialized tissues and organs are produced
Based on the information in Graph 3, chum salmon fry are likely to eat prey that is__________
prey eaten by the pink salmon fry and______________prey eaten by the coho salmon fry. This
is because as a salmon's size increases, its matter intake needs_____________ - Answer 1.
larger than
2. smaller than
3. increase
Which statement best explains how salmon obtain and use matter to support their biological
functions? - Answer Salmon break bonds in complex food molecules to release the carbon,
oxygen, and hydrogen atoms needed for the formation of other molecules
Which claim is best supported by the information about scales and feathers? - Answer
changes in placodes over time allowed for the development of different structures
Which statement best explains what caused some theropods to develop feathers?
Which information is evidence that best supports the answer to Part A? - Answer a mutation
in DNA affected the types of proteins produced by placodes
the DNA of mdoern-day vertabrates codes for the proteins in placodes
, Which evidence best supports the claim that birds evolved from dinosaurs? - Answer the
same sequences are found in the genetic information of theropods and birds
Mammals did not descend directly from dinosaurs, but mammals embryos have placodes, as
show in Figure 3. - Answer Mammals and dinosaurs descended from a common ancestor.
This ancestor must have had placodes and passed them down through generations. Figure 2
shows that dinosaurs and mammals have a common ancestor.
Which statement best explains the results shown in Table 1? - Answer trees from site 1 grow
less rapidly than trees from ste 2 because the trees have slower rates of cellular respiration at
site 1 than at site 2
Which claim about the transfer of energy in the tonewood ecosystem is best supported by data?
- Answer more energy is available to transer from the trophic level occupied by the red deer
at lower elevations than from the same trophic level at higher elevations
Tonewood trees are most likely to be produced as a result of___________temperatures
and_____________precipitation.
Which statements are evidence that supports the answer to Part A? - Answer 1. higher-than-
average
2. lower-than-average
1. in the year with the lower-than-average precipitation, the rate of cellular respiration in trees
at both sites was lower than average
2. in the year with the above-average temperatures and average precipitation, the rate of
growth at ste 2 decreased
Scientists have noted a difference in the concentration of atmospheric gases available to
Norway spruce trees at site 1 and site 2. Use Table 1 and Figure 2 to describe the difference in
atmospheric gases at each site. Explain how the flow of matter and energy differs in these two
locations as a result of the concentration difference. Use evidence from any of the tables or
figures to support your answer. - Answer When it rains, the trees are able to get nutrients
and can quicken their photosynthesis. This produces more glucose. In table 2, you can see that
trees with more rain have a greater diameter. An increase in diameter shows that more glucose
is being created in the areas with more rainfall.
Which questions could be answered using the results of this investigation? - Answer 1. is hair
length in german sheperds a dominant or recessive trait?
