100+ Free Puerto Rico CRECE Science — Grade 10 Practice Questions

Prepare for the Cernimiento, Revisión y Evaluación Continua del Estudiante (CRECE) — Science (Ciencias), Grade 10 exam with instant access — no signup required.

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DEPR reported island-wide 54% proficiency in Ciencias for the 2025-2026 administration; DEPR does not publish a separate rate per grade, and CRECE has no pass mark. Pass Rate

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Key Facts: Puerto Rico CRECE Science — Grade 10 Exam

Puerto Rico Department of Education (DEPR)

Exam Administrator

DEPR Division of Assessment

Grade 10 High School

Target Grade Level

PRCS 2022 Standards

PRCS 2022 (Estándares de Puerto Rico)

Standard Alignment

DEPR Curriculum Framework

100 Practice Questions

Question Count

OpenExamPrep Bank

No pass mark; four levels: Principiante, Aprendiz, Proficiente and Sobresaliente

Passing Tier

DEPR Performance Descriptors

CRECE Grade 10 Science is a biology assessment: DEPR reports one category, Biología, aligned to the grade 10 Biología course on cells and energy, body systems, taxonomy and reproduction, ecosystems, DNA and heredity, and evolution. OpenExamPrep's 100-question practice bank is an English-language MCQ study adaptation and is not an official-format simulation or a translation of the official DEPR CRECE assessment.

Sample Puerto Rico CRECE Science — Grade 10 Practice Questions

Try these sample questions to test your Puerto Rico CRECE Science — Grade 10 exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Which organelle is primarily responsible for converting glucose into ATP during aerobic cellular respiration in eukaryotic cells?

A.Mitochondrion

B.Ribosome

C.Golgi apparatus

D.Lysosome

Explanation: The mitochondrion is known as the powerhouse of the eukaryotic cell because it carries out aerobic cellular respiration (Krebs cycle and electron transport chain), converting chemical energy stored in glucose into usable adenosine triphosphate (ATP). Ribosomes synthesize proteins, the Golgi apparatus packages proteins, and lysosomes contain digestive enzymes.

2Which set of structures is present in plant cells but absent in animal cells?

A.Cell membrane and cytoplasm

B.Cell wall and chloroplast

C.Mitochondria and nucleus

D.Ribosomes and endoplasmic reticulum

Explanation: Plant cells possess a rigid cell wall composed of cellulose for structural support and chloroplasts containing chlorophyll for photosynthesis. Animal cells lack both chloroplasts and cell walls, possessing only a flexible cell membrane.

3What are the primary chemical reactants required for photosynthesis to occur in green plants?

A.Glucose and oxygen

B.Carbon dioxide and water

C.Carbon dioxide and oxygen

D.Glucose and carbon dioxide

Explanation: In photosynthesis, plants take in carbon dioxide (CO2) from the air and water (H2O) from the soil, utilizing sunlight captured by chlorophyll to produce glucose (C6H12O6) and release oxygen gas (O2). The balanced overall equation is 6 CO2 + 6 H2O + light energy -> C6H12O6 + 6 O2.

4What happens when a substrate binds to the active site of a biological enzyme?

A.The enzyme lowers the activation energy required for the chemical reaction to proceed

B.The enzyme is permanently consumed and destroyed during the chemical reaction

C.The enzyme raises the total enthalpy of the product molecules

D.The substrate changes the chemical composition of the enzyme permanently

Explanation: Enzymes are biological catalysts that speed up chemical reactions by lowering the activation energy barrier. When a substrate binds to the enzyme's active site, the enzyme stabilizes the transition state without being permanently altered or consumed in the process.

5What is the primary biological purpose of mitosis in multicellular organism eukaryotic somatic cells?

A.Growth, tissue repair, and asexual cell replacement

B.Production of haploid gametes for sexual reproduction

C.Reduction of chromosome number by half

D.Generating genetic variation through crossing over

Explanation: Mitosis produces two genetically identical diploid daughter cells from a single diploid parent cell. In multicellular organisms, mitosis functions in body growth, wound healing, and replacing damaged or worn-out somatic cells. Gamete formation and genetic recombination occur during meiosis.

6A student places freshwater Elodea plant leaf cells into a 10% saltwater solution. Under a microscope, the cytoplasm shrinks away from the cell wall. What osmotic mechanism causes this plasmolysis?

A.Water diffuses out of the cell because the external solution is hypertonic relative to the cytoplasm

B.Salt molecules actively diffuse into the vacuole to raise internal osmotic pressure

C.Water enters the cell rapidly because the external solution is hypotonic

D.Proteins in the plasma membrane actively pump water out of the cell against its concentration gradient

Explanation: A 10% saltwater solution has a higher solute concentration (and lower water potential) than the plant cytoplasm, making it hypertonic. Water diffuses out of the central vacuole down its concentration gradient via osmosis, causing the cell membrane to shrink away from the rigid cell wall (plasmolysis).

7In aerobic cellular respiration, which stage takes place in the cytoplasm and does not directly require molecular oxygen (O2)?

A.Glycolysis

B.Krebs cycle (Citric Acid Cycle)

C.Electron transport chain

D.Oxidative phosphorylation

Explanation: Glycolysis is the initial anaerobic pathway of cellular respiration that occurs in the cell cytoplasm. It splits one 6-carbon glucose molecule into two 3-carbon pyruvate molecules, yielding a net 2 ATP and 2 NADH without requiring oxygen.

8When a student exercises under humid conditions in Ponce, bodily core temperature rises. Sweat glands secrete sweat, which evaporates to cool the skin and lower internal core temperature back toward 37°C. This physiological response is an example of:

A.A negative feedback mechanism maintaining homeostasis

B.A positive feedback loop amplifying internal disturbance

C.Passive diffusion of cellular waste products

D.Anaerobic metabolic compensation

Explanation: Negative feedback loops counteract physiological deviations from a set point (such as body temperature or blood glucose), initiating mechanisms that reverse the initial change and restore internal stability (homeostasis).

9When a human enzyme that operates optimally at 37°C is heated to 65°C, its catalytic reaction rate drops to zero. What structural alteration explains this loss of biological activity?

A.High thermal energy disrupts hydrogen and ionic bonds, denaturing the 3D tertiary structure of the active site

B.Excess heat breaks covalent peptide bonds, converting the protein back into individual amino acids

C.High temperature converts the enzyme into a competitive lipid inhibitor

D.Heat causes the enzyme's mRNA template to degrade permanently inside the nucleus

Explanation: Elevated temperatures cause extreme molecular vibration, breaking weak non-covalent interactions (hydrogen bonds, ionic interactions) stabilizing the enzyme's 3D tertiary structure. This denatures the protein and distorts the active site so substrates can no longer bind.

10How are phospholipid molecules arranged within a eukaryotic plasma membrane according to the fluid mosaic model?

A.Hydrophilic phosphate heads face outward toward aqueous environments, while hydrophobic fatty acid tails face inward away from water

B.Hydrophobic phosphate heads face outward toward water, while hydrophilic fatty acid tails face inward

C.Phospholipids form a single rigid monolayer with embedded starch polymers

D.Hydrophilic tails point outward into the extracellular fluid, while hydrophobic heads touch the cell wall

Explanation: Phospholipids are amphipathic. In an aqueous environment, they spontaneously assemble into a double layer (bilayer) where polar hydrophilic phosphate heads face the aqueous intracellular and extracellular fluids, and nonpolar hydrophobic fatty acid tails face inward toward each other.

About the Puerto Rico CRECE Science — Grade 10 Exam

The Cernimiento, Revisión y Evaluación Continua del Estudiante (CRECE) Grade 10 Science assessment is reported under a single official category, Biología, because grade 10 in the Puerto Rico Core Standards 2022 is the Biología course. It covers cell structure and processes and human body systems (ES.B1); classification, structure, function, growth and reproduction (ES.B2); ecosystem interdependence, matter and energy cycling and biodiversity (ES.B3); DNA, heredity and variation (ES.B4); evolution and natural selection (ES.B5); and science and engineering practices (ES.B.IT1 and ES.B.IT2). OpenExamPrep's 100-question practice bank is an English-language MCQ study adaptation and is not an official-format simulation or a translation of the official DEPR CRECE assessment.

Assessment

DEPR reports CRECE Ciencias at grade 10 under these official categories: Biología. Under the Puerto Rico Core Standards 2022 the grade 10 science course is Biología. DEPR does not publish per-category item counts or weights. This bank is an English-language MCQ study adaptation distributed across those categories and does not simulate the official format, its Spanish or English delivery language, or its open-response tasks.

Time Limit

Not published by DEPR. CRECE is administered in scheduled school sessions during the spring window (the grade-10 online window ran 13 April to 1 May in 2026).

Passing Score

No pass or fail score. DEPR reports one of four performance levels per subject: Principiante, Aprendiz, Proficiente and Sobresaliente; the combined Proficiente and Sobresaliente share is reported as proficiency.

Exam Fee

Free — no candidate fee; CRECE is funded and administered by DEPR for enrolled students. (Puerto Rico Department of Education (DEPR); delivered by Pearson)

Puerto Rico CRECE Science — Grade 10 Exam Content Outline

Not published

Biología

Biology, the single reporting category for grade 10. Grade 10 in the Puerto Rico Core Standards 2022 is Biología, covering cells and their processes (ES.B1), classification, structure, function and reproduction (ES.B2), ecosystems and biodiversity (ES.B3), DNA and heredity (ES.B4), evolution and natural selection (ES.B5), and science and engineering practices (ES.B.IT1, ES.B.IT2).

How to Pass the Puerto Rico CRECE Science — Grade 10 Exam

What You Need to Know

Passing score: No pass or fail score. DEPR reports one of four performance levels per subject: Principiante, Aprendiz, Proficiente and Sobresaliente; the combined Proficiente and Sobresaliente share is reported as proficiency.
Assessment: DEPR reports CRECE Ciencias at grade 10 under these official categories: Biología. Under the Puerto Rico Core Standards 2022 the grade 10 science course is Biología. DEPR does not publish per-category item counts or weights. This bank is an English-language MCQ study adaptation distributed across those categories and does not simulate the official format, its Spanish or English delivery language, or its open-response tasks.
Time limit: Not published by DEPR. CRECE is administered in scheduled school sessions during the spring window (the grade-10 online window ran 13 April to 1 May in 2026).
Exam fee: Free — no candidate fee; CRECE is funded and administered by DEPR for enrolled students.

Keys to Passing

Work through all 100 available questions
Review every answer and explanation
Track weak areas and revisit them
Use our AI tutor for tough concepts

Puerto Rico CRECE Science — Grade 10 Study Tips from Top Performers

1Work from the cell outward: organelle functions, the fluid mosaic membrane, diffusion, osmosis and active transport, then enzymes, photosynthesis and cellular respiration including anaerobic pathways.

2Learn how human organ systems interact — respiratory with circulatory, excretory with homeostasis, nervous with muscular — rather than memorising each system in isolation.

3Practise Linnaean classification, binomial nomenclature and the three domains, and contrast asexual with sexual reproduction and complete with incomplete metamorphosis.

4For ecology, follow both matter and energy: trophic levels and the roughly ten per cent transfer, decomposers and biogeochemical cycles, symbiosis, carrying capacity, and local cases such as invasive mongoose and coral bleaching.

5For genetics and evolution, practise Punnett squares including incomplete dominance, transcription and translation with three-base codons, and the evidence for evolution from fossils, homologous and vestigial structures and molecular comparisons.

Frequently Asked Questions

What is the DEPR CRECE Grade 10 Science assessment?

The Cernimiento, Revisión y Evaluación Continua del Estudiante (CRECE) Grade 10 Science test is a standardized assessment administered by the Puerto Rico Department of Education (DEPR) to monitor academic progress and master key Grade 10 science standards.

Is OpenExamPrep's practice bank an official test simulation?

No. OpenExamPrep's 100-question practice bank is an English-language MCQ study adaptation and not an official-format simulation or translation of the official DEPR CRECE assessment.

What scientific domains are assessed on CRECE Grade 10 Science?

DEPR reports this test under the following official categories: Biología. Under the Puerto Rico Core Standards 2022 the grade 10 science course is Biología. DEPR does not publish weights for these categories.

How is student performance scored on CRECE?

CRECE has no pass mark. DEPR reports one of four performance levels for each subject: Principiante, Aprendiz, Proficiente and Sobresaliente. Reports combine Proficiente and Sobresaliente into a single proficiency figure, and results are delivered through the Pearson ADAM platform to schools, regions and families.

How can students effectively prepare for the Grade 10 CRECE Science exam?

Students should review key biology principles, chemical reactions, physics equations, Caribbean earth science phenomena, and practice scientific data analysis and hypothesis evaluation using targeted multiple-choice practice questions.

100+ Free Puerto Rico CRECE Science — Grade 10 Practice Questions

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