California Science Test (CAST) Practice Exam
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About this Exam
Prepare with the California Science Test (CAST) Practice Exam practice quiz. This question bank includes 10 questions covering term, describes, light, organisms, and called. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.
Sample Questions
Question
1
What term describes a classification grouping that contains similar, closely related organisms?
Explanation:
Grouping similar and closely related organisms is described by a genus, a rank in biological classification. Genus sits above species and below family, and it collects species that share strong similarities and a common evolutionary history. For example, many species that look alike and behave in related ways are placed in the same genus. This helps scientists organize biodiversity in a systematic way. Prokaryote and eukaryote describe cellular organization—whether organisms have a nucleus and other cellular features—rather than grouping closely related organisms. A solution is just a mixture of substances and isn’t a biological classification term.
Question
2
An upside-down image formed where light rays meet is called a
Explanation:
A real image is formed when light rays actually converge to a point in space. Because the rays cross, the image you’d see (or project onto a screen) is inverted relative to the object. This contrasts with a virtual image, which is formed by diverging rays that only appear to originate from a point and cannot be projected, and is usually upright. The focal point is simply where rays converge after reflection or refraction, the optical axis is just the reference line through the system, and a lens is the device that bends the light, not the image itself. So an upside-down image formed where light rays meet is a real image.
Question
3
Which term describes the process of selecting a few organisms with desired traits to serve as parents of the next generation?
Explanation:
Selective breeding is choosing individuals with desirable traits to serve as parents for the next generation. By selecting those organisms that display the traits we want and allowing them to reproduce, those traits are more likely to appear in their offspring, and, over generations, become more common in the population. This is driven by humans, using natural variation that already exists. This differs from hybridization, which involves crossing individuals to combine traits and often involves different varieties or species; cloning, which creates an exact genetic copy of one organism; and genetic engineering, which directly alters genes using laboratory techniques. An example of selective breeding is choosing cows that produce a lot of milk and breeding them to increase milk yield in the herd.
Question
4
What term describes a large organic molecule made from amino acids?
Explanation:
Molecules built from amino acids that become large and functional are proteins. Proteins are polymers formed when many amino acids link together through peptide bonds to create long chains that fold into specific three‑dimensional shapes. Those shapes enable a wide range of jobs in the cell, from speeding up chemical reactions (enzymes) to providing structure (collagen) and carrying substances (hemoglobin). The term here points to a particular kind of polymer that specifically consists of amino acids and has biological roles, which is why protein is the best answer. A general polymer is a large molecule made of repeating units, but it doesn’t name the specific type made from amino acids. A monomer is a single amino acid, not the entire molecule. An ester is a chemical group, not the large biomolecule described.
Question
5
Which term describes a diagram that shows how a trait is passed through generations?
Explanation:
A pedigree is the diagram that shows how a trait is passed from one generation to the next. In pedigrees, males are usually squares and females are circles; a horizontal line connects spouses, and vertical lines link parents to their offspring across generations. Shading or other marks indicate who has the trait, making it easy to see inheritance patterns, such as whether a trait tends to appear in every generation or skip generations. This focus on inheritance across generations distinguishes it from a general family tree, which maps relationships without emphasizing how traits are transmitted. So the term that fits best is pedigree.
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California Science Test (CAST) Practice Exam
This practice set contains 10 questions from the matching question bank and focuses on term, describes, light, organisms, and called. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.
This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.
Frequently Asked Questions
This quiz contains a total of 10 practice questions carefully selected to test your knowledge on this subject.
Yes, you will have exactly 0 minutes to complete the exam. A countdown timer will be visible once you start.
Yes, you can retake this practice test as many times as you need. The questions and options may be randomized on subsequent attempts to ensure comprehensive learning.
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