Science 7 - Second Quarter Test
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Questions and Answers

Which combination of cells includes only plant cells?

  • Cell C and D (correct)
  • Cell D only
  • Cell A and C
  • Cell A only

    • Which structures are found in both plant and animal cells?

  • Centriole, chloroplast, mitochondria
  • Cell wall, mitochondria, ribosome
  • Mitochondria, nucleus, ribosome (correct)
  • Cell wall, centriole, chloroplast

    • Which statement about cells X, Y, and Z is correct?

  • Cell Y and Z are animal cells.
  • Cell X is a plant cell.
  • Cells X, Y, and Z are animal cells.
  • Cell Z is a plant cell. (correct)

    • Which type of cell division is mainly responsible for growth in multicellular organisms?

    <p>Mitosis</p> Signup and view all the answers

    Which type of cell division leads to a reduction in chromosome number?

    <p>Meiosis</p> Signup and view all the answers

    Which cells likely contain chloroplasts?

    <p>Plant cells</p> Signup and view all the answers

    What structure is common to both plant and animal cells?

    <p>Nucleus</p> Signup and view all the answers

    In which type of organisms is meiosis primarily used?

    <p>Reproductive cells</p> Signup and view all the answers

    Where should a microscope be placed for storage to keep it in good condition?

    <p>in a dry, dust-free cabinet or case</p> Signup and view all the answers

    Which of the following is NOT a proper method for handling microscopes?

    <p>Carry the microscope with one hand.</p> Signup and view all the answers

    Which part of the microscope do you look through to observe the specimen?

    <p>the eyepiece lens</p> Signup and view all the answers

    If Maria needs to raise the body of the microscope to focus on her specimen using the low power objective, which part should she manipulate?

    <p>the coarse adjustment knob</p> Signup and view all the answers

    Which parts should Pedro hold when transferring the compound microscope properly?

    <p>the base and the arm</p> Signup and view all the answers

    Why does a student cover the onion specimen with a cover slip?

    <p>to protect the cells</p> Signup and view all the answers

    What is the purpose of using lens paper when cleaning the microscope's objectives?

    <p>to prevent scratching the lenses</p> Signup and view all the answers

    Which is the correct way to start focusing on a specimen under low power?

    <p>using the coarse adjustment knob first</p> Signup and view all the answers

    What type of cell division results in daughter cells that are genetically identical to the parent cell?

    <p>Mitosis</p> Signup and view all the answers

    Why is mitosis crucial for the growth and repair of tissues in multicellular organisms?

    <p>It creates identical cells that replace old or damaged cells.</p> Signup and view all the answers

    In the context of skin repair after an injury, why is mitosis significant?

    <p>Mitosis produces new cells identical to the damaged ones to replace them.</p> Signup and view all the answers

    If a potato (Solanum tuberosum) has a chromosome number of 24, how many chromosomes will each daughter cell have after mitosis?

    <p>24</p> Signup and view all the answers

    At which stage of meiosis does crossing over occur?

    <p>Stage C</p> Signup and view all the answers

    What event occurs during stage G of meiosis?

    <p>Sister chromatids separate and move to opposite poles.</p> Signup and view all the answers

    Which of the following statements about stage H of meiosis is INCORRECT?

    <p>Diploid cells are produced.</p> Signup and view all the answers

    What is the main purpose of meiosis in multicellular organisms?

    <p>To generate genetic diversity through gametes.</p> Signup and view all the answers

    What process results in the production of four daughter cells?

    <p>Meiosis</p> Signup and view all the answers

    What is the primary role of gametes in sexual reproduction?

    <p>To form zygotes</p> Signup and view all the answers

    How does fertilization conserve the chromosome number in offspring?

    <p>By combining two cells with half the chromosome number from each parent</p> Signup and view all the answers

    Which statement best describes a zygote?

    <p>A cell formed by the fusion of two gametes, restoring the chromosome number</p> Signup and view all the answers

    Why is it necessary for gametes to consist of half the chromosome number?

    <p>To ensure offspring receive an appropriate chromosome count upon fertilization</p> Signup and view all the answers

    How do offspring secure genetic material from both parents?

    <p>By receiving half of their chromosomes from each parent through gametes</p> Signup and view all the answers

    Which characteristic is true for asexual reproduction?

    <p>Involves a single parent creating genetic clones</p> Signup and view all the answers

    If an organism reproduces by splitting into two identical copies, what type of reproduction is occurring?

    <p>Asexual reproduction</p> Signup and view all the answers

    What is true about offspring produced through sexual reproduction?

    <p>It will exhibit unique traits due to genetic variation.</p> Signup and view all the answers

    Which method should be used to propagate a strawberry plant while keeping its genetic traits identical?

    <p>Take a cutting from a healthy runner of the original plant.</p> Signup and view all the answers

    Which statement accurately differentiates asexual and sexual reproduction?

    <p>Asexual reproduction produces new individuals from a single parent.</p> Signup and view all the answers

    Which of the following pairs reproduce sexually?

    <p>Humans and flowering plants</p> Signup and view all the answers

    What characterizes offspring from asexual reproduction compared to sexual reproduction?

    <p>Offspring are clones of the parent organism.</p> Signup and view all the answers

    How do flowering plants typically reproduce?

    <p>By pollination, involving sex cells.</p> Signup and view all the answers

    What inference can be made about animals that reproduce sexually?

    <p>Offspring will have a genetic combination from both parents.</p> Signup and view all the answers

    Which of the following is NOT a characteristic of asexual reproduction?

    <p>It involves the fusion of gametes.</p> Signup and view all the answers

    Which of the following can be inferred from the information in the table?

    <p>Only organism N reproduces through sexual reproduction.</p> Signup and view all the answers

    If multiple kinds of fish live together in a lake, which level of biological organization does this represent?

    <p>Community</p> Signup and view all the answers

    If a cell is damaged, which higher levels of biological organization could potentially be affected?

    <p>Tissues, organs, and organ systems</p> Signup and view all the answers

    In the human body, muscles are made up of cells working together. This arrangement is an example of which level in biological organization?

    <p>Tissue</p> Signup and view all the answers

    In a forest, many kinds of plants and animals interact with the nonliving components like sunlight, water, soil, and air. Which of the following BEST represents this level?

    <p>Ecosystem</p> Signup and view all the answers

    As energy flows up the food pyramid, what happens to the amount of available energy at each trophic level?

    <p>It decreases.</p> Signup and view all the answers

    In a food pyramid, why are there generally fewer organisms at higher trophic levels than at lower ones?

    <p>The energy available decreases at each level, supporting fewer organisms.</p> Signup and view all the answers

    Which level of biological organization represents groups of the same species living in a specific area?

    <p>Population</p> Signup and view all the answers

    Study Notes

    Science 7 - Second Quarter Test

    • General Instructions: Answer questions by writing the capital letter of the correct answer in the space before each item.

    • Question 1: Where should a microscope be stored for optimal condition?

      • A dry, dust-free cabinet or case.

    • Question 2: Which microscope handling method is NOT proper?

      • Carry the microscope with one hand.

    • Question 3: Which microscope part do you look through to view specimens?

      • The ocular lens (item 1)

    • Question 4: What part of the microscope should Maria adjust to raise the microscope body for low-power viewing?

      • Item 7 (coarse adjustment knob)

    • Question 5: Which parts of the microscope should Pedro hold when transferring it to another room?(reference diagram)

      • Items 2 and 4 (base and arm)

    • Question 6: Why is a cover slip placed over a specimen on a slide?

      • To keep the cells flat and provide a better view.

    • Question 7: What technique is best for focusing on a cell structure?

      • Starting with the low power, then switching to high power objective

    • Question 8: Based on the image, identify the observed cell part.

      • Centriole

    • Question 9: What additional structure would Dahlia likely see in the onion cell?

      • Cytoplasm

    • Question 10: Identify the correct labels for parts X and Y of the plant cell.

      • X (nucleus), Y (cell wall)

    • Question 11: Characteristic of multicellular organisms

      • Made up of many specialized cells

    • Question 12: Why are multicellular organisms more complex?

      • Specialized cells working together

    • Question 13: Which chart correctly differentiates unicellular and multicellular organisms?

      • The chart showing that multicellular organisms have many cells and can reproduce asexually or sexually.

    • Question 14: Which parts are present in plant cells but not animal cells?

      • Cell wall and chloroplasts

    • Question 15: Which option represents a plant cell (refer to the table)

      • Cell C and D (as per the information provided in the table)

    • Question 16: Structures present in both plant and animal cells?

      • Mitochondria, nucleus, and ribosomes

    • Question 17: Which statement is correct regarding the information about the three cells (X, Y, and Z)?

      • Cell Z is a plant cell (based on the provided table)

    • Question 18: Primary cell division for growth and repair in multicellular organisms?

      • Mitosis

    • Question 19: Cell division that reduces the chromosome number by half?

      • Meiosis

    • Question 20: Cell division resulting in genetically identical daughter cells?

      • Mitosis

    • Question 21: Importance of mitosis for skin repair?

      • Produces cells identical to the damaged ones

    • Question 22: Importance of mitosis after injury? - Creates identical cells to replace damaged ones.

    • Question 23: If a potato (chromosome number 24) undergoes mitosis, how many chromosomes are in each daughter cell?

      • 24

    • Question 24: Stage of meiosis where crossing over occurs

      • Stage C (referring to depicted diagram)

    • Question 25: Event occurring during stage G (refer to diagram)

      • Homologous chromosomes separate and migrate to opposite poles.

    • Question 26: Which statement is incorrect about stage H (refer to diagram)

      • Diploid cells are produced.

    • Question 27: Combining of genetic material in sexual reproduction

      • Fertilization

    • Question 28: Main function of gametes in sexual reproduction

      • To form zygotes

    • Question 29: How does fertilization restore the chromosome number?

      • By combining two cells with half the chromosome number (from each parent)

    • Question 30: Definition of a zygote

      • A cell formed by the fusion of gametes.

    • Question 31: Importance of gametes having half the chromosome number?

      • To allow fertilization to restore the full chromosome number.

    • Question 32: How do offspring receive genetic information from parents?

      • They receive half of their chromosomes from each parent.

    • Question 33: Which is true of asexual reproduction?

      • Involves only one parent.

    • Question 34: Characteristics of offspring from asexual reproduction

      • Genetically identical to the parent

    • Question 35: Features of sexually reproducing animals' offspring

      • Genetically unique combinations of traits

    • Question 36: Method for maintaining identical genetic traits of a strawberry plant

      • Taking a runner (stem cutting) of the parent plant

    • Question 37: Which statement is correct regarding asexual and sexual reproduction?

      • Asexual reproduction doesn't use sex cells.

    • Question 38: Which organisms reproduces asexually?

      • Hydra (budding) and mushrooms (spores)

    • Question 39: Which type of reproduction do organisms M, N, and O exhibit from the table?

      • Organism M is asexual, N is asexual, and O is sexual.

    • Question 40: Biological organization level exemplified by a group of fish living together in a lake

      • Community

    • Question 41: If a cell is damaged, which biological organizational levels can be impacted?

      • Tissues, organs, and organ systems

    • Question 42: Example of a tissue-level organism organization

      • Muscles made up of cells.

    • Question 43: Representing plants and animals interacting with nonliving components.

      • Ecosystem

    • Question 44: Effect of energy flow in the food pyramid.

      • Energy decreases at each level or reduces

    • Question 45: Reasoning for fewer organisms at higher trophic levels?

      • Decreasing energy available at each level.

    • Question 46: Why are grass and shrubs considered producers?

      • They convert sunlight energy into chemical energy (glucose)

    • Question 47: Organism containing highest energy of the given food web/pyramid.

      • Grass

    • Question 48: Trophic level of a snake

      • Secondary consumer

    • Question 49: Energy flow from snake to eagle in the food pyramid

      • The eagle receives a fraction of the energy, not 100%

    • Question 50: Percentage of energy transferred in a food web from prey to predator

      • 10%

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