Grade 8 – 4th Quarter (Living Things And Their Environment)

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  • 1/20 Questions

    What is the digestive process by which food is taken into the alimentary canal?

    • Ingestion
    • Absorption
    • Assimilation
    • Excretion
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About This Quiz

This Grade 8 quiz covers key processes in cell biology and human digestion, assessing understanding of mitosis stages and digestive functions. It aids students in grasping how living organisms manage cellular and digestive functions effectively.

Grade 8 4th Quarter (Living Things And Their Environment) - Quiz

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  • 2. 

    What is the digestive process by which components or chemicals from food are taken into the cells of the body after the food or beverage has been digested and absorbed?

    • Ingestion

    • Absorption

    • Assimilation

    • Excretion

    Correct Answer
    A. Assimilation
    Explanation
    Assimilation refers to the process by which components or chemicals from food are taken into the cells of the body after the food or beverage has been digested and absorbed. This process involves the absorption of nutrients and their conversion into forms that can be used by the body for energy, growth, and repair. It is an essential step in the digestive process as it ensures that the body receives the necessary nutrients from the food consumed.

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  • 3. 

    What digestive process is the uptake of fluids or other substances by the tissues of the body?

    • Ingestion

    • Absorption

    • Assimilation

    • Excretion

    Correct Answer
    A. Absorption
    Explanation
    Absorption is the correct answer because it refers to the process in which fluids or other substances are taken up by the tissues of the body. It occurs primarily in the small intestine, where nutrients from food are absorbed into the bloodstream and transported to the cells for energy and other functions. This process is essential for the body to obtain the necessary nutrients and maintain proper functioning. Ingestion refers to the intake of food, assimilation refers to the conversion of nutrients into usable forms, and excretion refers to the elimination of waste products.

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  • 4. 

    What digestive process is the elimination of metabolic waste products?

    • Ingestion

    • Absorption

    • Assimilation

    • Excretion

    Correct Answer
    A. Excretion
    Explanation
    Excretion is the correct answer because it refers to the process of eliminating metabolic waste products from the body. This includes the removal of substances such as carbon dioxide, urea, and excess water through organs like the lungs, kidneys, and skin. Ingestion is the process of taking in food, absorption is the process of absorbing nutrients into the bloodstream, and assimilation is the process of incorporating nutrients into cells and tissues. Therefore, excretion is the only option that accurately describes the elimination of waste products.

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  • 5. 

    What stage in mitosis when spindle fibers align the chromosomes along the middle of the cell nucleus?

    • Prophase

    • Metaphase

    • Anaphase

    • Telophase

    Correct Answer
    A. Metaphase
    Explanation
    During metaphase, the spindle fibers align the chromosomes along the equatorial plane of the cell nucleus. This alignment ensures that each chromosome is correctly positioned and ready for separation during the subsequent stage of mitosis, anaphase. The chromosomes are attached to the spindle fibers at their centromeres, which allows for equal distribution of genetic material to the daughter cells. Therefore, metaphase is the stage in mitosis when the chromosomes are aligned in the middle of the cell nucleus by the spindle fibers.

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  • 6. 

    What stage in mitosis happens before cytokinesis?

    • Prophase

    • Metaphase

    • Anaphase

    • Telophase

    Correct Answer
    A. Telophase
    Explanation
    Telophase is the stage in mitosis that occurs before cytokinesis. During telophase, the nuclear envelope reforms around the separated chromosomes, the spindle fibers disassemble, and the chromosomes begin to decondense. Cytokinesis, the division of the cytoplasm, follows telophase and completes the process of cell division. Therefore, telophase is the correct answer as it precedes cytokinesis in the sequence of events during mitosis.

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  • 7. 

    What is the proper steps of meiosis?

    • Telophase I - anaphase I - metaphase I - prophase I - telophase II - anaphase II - metaphase II - prophase II

    • Anaphase I - prophase I - metaphase I - telophase I - anaphase II - prophase II - metaphase II - telophase II

    • Prophase I - anaphase I - telophase I - metaphase I - prophase II - anaphase II - telophase II - metaphase II

    • Prophase I - metaphase I - anaphase I - telophase I - prophase II - metaphase II - anaphase II - telophase II

    Correct Answer
    A. Prophase I - metaphase I - anaphase I - telophase I - prophase II - metaphase II - anaphase II - telophase II
    Explanation
    The correct answer is prophase I - metaphase I - anaphase I - telophase I - prophase II - metaphase II - anaphase II - telophase II. This is the correct sequence of steps in meiosis. During prophase I, homologous chromosomes pair up and exchange genetic material through crossing over. Metaphase I is when the pairs of homologous chromosomes line up at the center of the cell. Anaphase I is when the homologous chromosomes separate and move to opposite ends of the cell. Telophase I is when the chromosomes reach the opposite ends of the cell and the cell starts to divide. Prophase II, metaphase II, anaphase II, and telophase II are similar to the corresponding stages in mitosis, resulting in the formation of four haploid cells.

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  • 8. 

    How many daughter cells meiosis produced?

    • 4 haploid cells

    • 2 diploid cells

    • 2 haploid cells

    • 4 diploid cells

    Correct Answer
    A. 4 haploid cells
    Explanation
    Meiosis is a type of cell division that occurs in sexually reproducing organisms. It involves two rounds of division, resulting in the formation of four daughter cells. These daughter cells are haploid, meaning they have half the number of chromosomes as the parent cell. Therefore, the correct answer is 4 haploid cells.

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  • 9. 

    What is/are the possible phenotype of purple pea plant flowers' offsprings if the parents are pp x PP?

    • All homozygous purple

    • All heterozygous purple

    • 3 homozygous purple, 1 heterozygous purple

    • 2 homozygous purple, 2 heterozygous purple

    Correct Answer
    A. All heterozygous purple
    Explanation
    When the parents are pp x PP, one parent is homozygous recessive (pp) and the other parent is homozygous dominant (PP). In this case, all the offspring will be heterozygous (Pp) because they inherit one dominant allele (P) from the dominant parent and one recessive allele (p) from the recessive parent. This results in all the offspring having the purple phenotype.

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  • 10. 

    What is the term used to describe the physical appearance of a particular trait?

    • Recessive

    • Dominant

    • Genotype

    • Phenotype

    Correct Answer
    A. Phenotype
    Explanation
    Phenotype refers to the physical appearance or characteristics of a particular trait. It is the observable expression of an individual's genetic makeup (genotype). The term "phenotype" is used to describe the visible traits or characteristics that can be observed or measured, such as hair color, eye color, or height. In contrast, genotype refers to the genetic composition or combination of alleles that an individual possesses. The terms "recessive" and "dominant" are used to describe the inheritance patterns of traits, but they do not specifically refer to the physical appearance of a trait.

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  • 11. 

    What Mendel's law of inheritance by which a dominant allele completely masks the effects of a recessive allele?

    • Segregation

    • Independent assortment

    • Dominance

    • Multiple allele

    Correct Answer
    A. Dominance
    Explanation
    The correct answer is dominance. Mendel's law of dominance states that when a dominant allele is present, it completely masks the effects of a recessive allele. This means that even if an individual has one dominant allele and one recessive allele for a particular trait, the dominant allele will be expressed and the recessive allele will be hidden. This is why some traits are only seen in individuals who have two copies of the recessive allele.

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  • 12. 

    What Mendel's law of inheritance by which alleles on different chromosomes is distributed randomly to individual gametes?

    • Segregation

    • Independent assortment

    • Dominance

    • Multiple allele

    Correct Answer
    A. Independent assortment
    Explanation
    Mendel's law of independent assortment states that alleles on different chromosomes are distributed randomly to individual gametes. This means that the inheritance of one trait is not dependent on the inheritance of another trait. This law explains how different traits can be inherited independently of each other, leading to genetic variation in offspring.

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  • 13. 

    Which of the taxonomic category is often defined as the largest group of organisms capable of interbreeding and producing fertile offspring?

    • Species

    • Family

    • Class

    • Kingdom

    Correct Answer
    A. Species
    Explanation
    Species is often defined as the largest group of organisms capable of interbreeding and producing fertile offspring. This taxonomic category is used to classify organisms that share similar characteristics and can reproduce with one another. The concept of a species is important in understanding the diversity and relationships between different organisms in the natural world.

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  • 14. 

    Which of the taxonomic category is the highest rank, grouping together all forms of life having certain fundamental characteristics in common?

    • Species

    • Family

    • Class

    • Kingdom

    Correct Answer
    A. Kingdom
    Explanation
    The highest taxonomic category is the kingdom. It is the broadest and most inclusive rank that groups together all forms of life that share certain fundamental characteristics in common. Kingdoms represent the largest classification level in the Linnaean system of taxonomy and are further divided into smaller categories such as phylum, class, order, family, genus, and species.

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  • 15. 

    What are organisms of an ecological food chain receive energy by consuming other organisms?

    • Producers

    • Consumers

    • Detrivores

    • Predators

    Correct Answer
    A. Consumers
    Explanation
    Consumers are organisms in an ecological food chain that receive energy by consuming other organisms. They are classified as primary, secondary, or tertiary consumers based on their position in the food chain. Primary consumers, also known as herbivores, feed directly on producers (plants) for energy. Secondary consumers are carnivores that feed on herbivores, while tertiary consumers are carnivores that feed on other carnivores. Consumers play a crucial role in transferring energy and nutrients through the food chain, ultimately sustaining the entire ecosystem.

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  • 16. 

    What consumers eat both plants and animals?

    • Herbivores

    • Carnivores

    • Omnivores

    • Scavengers

    Correct Answer
    A. Omnivores
    Explanation
    Omnivores are consumers that eat both plants and animals. They have a varied diet and can obtain nutrients from both sources. This allows them to adapt to different environments and maximize their chances of survival. Examples of omnivores include humans, bears, and pigs. They have the ability to digest and extract nutrients from a wide range of food options, making them highly versatile in their eating habits.

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  • 17. 

    What organisms make their own food?

    • Producers

    • Consumers

    • Detrivores

    • Predators

    Correct Answer
    A. Producers
    Explanation
    Producers are organisms that have the ability to make their own food through the process of photosynthesis or chemosynthesis. They convert sunlight or inorganic compounds into organic molecules, such as glucose, which can be used as a source of energy. Examples of producers include plants, algae, and some bacteria. Consumers, detrivores, and predators, on the other hand, obtain their energy by consuming other organisms.

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  • 18. 

    What consumers eat only plants?

    • Herbivores

    • Carnivores

    • Omnivores

    • Scavengers

    Correct Answer
    A. Herbivores
    Explanation
    Herbivores are consumers that only eat plants. They do not consume meat or other animal products. They obtain their nutrients and energy solely from plant-based sources. This dietary preference distinguishes them from carnivores, which eat only meat, omnivores, which consume both plants and animals, and scavengers, which feed on dead animals or decaying matter. Herbivores have specialized digestive systems that allow them to break down and extract nutrients from plant material efficiently. They play a crucial role in ecosystems by helping to control plant populations and serving as a food source for other organisms.

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  • 19. 

    What do animals give off into the atmosphere?

    • Sulfur

    • Nitrogen

    • Carbon dioxide

    • Oxygen

    Correct Answer
    A. Carbon dioxide
    Explanation
    Animals give off carbon dioxide into the atmosphere through the process of respiration. During respiration, animals take in oxygen and release carbon dioxide as a waste product. This carbon dioxide is then released into the atmosphere where it plays a role in the Earth's carbon cycle. Carbon dioxide is a greenhouse gas that contributes to global warming and climate change.

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  • 20. 

    What do plants give off into the atmosphere?

    • Sulfur

    • Nitrogen

    • Carbon dioxide

    • Oxygen

    Correct Answer
    A. Oxygen
    Explanation
    Plants give off oxygen into the atmosphere through a process called photosynthesis. During photosynthesis, plants use sunlight, water, and carbon dioxide to produce glucose and release oxygen as a byproduct. Oxygen is essential for the survival of many organisms, including humans, as it is necessary for respiration. Therefore, the correct answer is oxygen.

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Quiz Review Timeline (Updated): Nov 29, 2024 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Nov 29, 2024
    Quiz Edited by
    ProProfs Editorial Team
  • Apr 23, 2016
    Quiz Created by
    Marcelomarisol

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