Quizbee Questions Science 7 from Sto. Cristo National High School, Republic of the Philippines.

The image you've uploaded contains a Science 7 Quizbee from Sto. Cristo National High School in the Philippines, with questions categorized as "Easy" and "Average." The quiz includes multiple-choice questions with provided answers. Below is a detailed explanation of each question and its correct answer, based on scientific principles.

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✔ EASY QUESTIONS

#### 1. Which statement describes the solute?
Answer: C. It is the component of a solution in smaller amount

Explanation:
In a solution, the solute is the substance that dissolves in the solvent. For example, in saltwater, salt (NaCl) is the solute because it's present in a smaller amount compared to water (the solvent). The solvent is the component present in the larger amount. So, option C correctly defines the solute.

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#### 2. Calcium chloride is a compound of the two elements calcium and chlorine. Which of the following statements is TRUE?
Answer: B. The symbol for calcium chloride includes Ca and Cl

Explanation:
- A. False — Compounds like calcium chloride (CaCl₂) are not listed in the periodic table; only elements are.
- B. True — The chemical formula for calcium chloride is CaCl₂, which includes the symbols Ca (calcium) and Cl (chlorine).
- C. False — Chlorine is an element and cannot be broken down further by chemical means.
- D. False — Calcium is in Group 2 (alkaline earth metals), while chlorine is in Group 17 (halogens).

So, B is correct.

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#### 3. The organ systems of plants consist of the root and shoot systems. Why is it important for these organ systems to work together?
Answer: A. To grow and survive

Explanation:
- The root system absorbs water and nutrients from the soil.
- The shoot system (stems, leaves) performs photosynthesis and transports materials.
- Together, they support growth, nutrient uptake, and reproduction.
- While avoiding pests or surviving disasters (options B, C, D) may be side benefits, the primary reason both systems must work together is to grow and survive.

Thus, A is the best answer.

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#### 4. If the chloroplasts of plant cell are damaged, which will it be unable to do?
Answer: C. Excrete waste materials

Wait — this seems incorrect. Let’s analyze:

Chloroplasts are responsible for photosynthesis, where plants make their own food using sunlight, CO₂, and water.

Let’s evaluate the options:
- a. Protect the cell → That's the function of the cell wall and membrane, not chloroplasts.
- b. Make food for the cell → This is correct — chloroplasts produce glucose via photosynthesis.
- c. Excrete waste materials → This is done by vacuoles or other organelles, not chloroplasts.
- d. Give instruction for cell to reproduce → That's the nucleus.

But the given answer is C, which is wrong. The correct answer should be b. Make food for the cell.

✘ Error in the quiz: The correct answer should be B, not C.

> ⚠️ Correction: If chloroplasts are damaged, the plant cannot perform photosynthesis, so it can't make food. Therefore, answer should be B, not C.

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#### 5. A sperm cell unites with an egg cell to form a zygote. Which process is taking place?
Answer: B. Fertilization

Explanation:
- Fertilization is the fusion of male and female gametes (sperm and egg) to form a zygote.
- Pollination (A) is transfer of pollen, not fusion.
- Asexual reproduction (C) involves one parent without gametes.
- Vegetative propagation (D) is a type of asexual reproduction.

✔ So, B is correct.

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✔ AVERAGE QUESTION

#### 1. Compared to a thin string of the same length and tightness, a thick string produces sounds of ________.
Answer: B. Lower pitch

Explanation:
Pitch depends on the frequency of vibration. Thicker strings have more mass, so they vibrate more slowly (lower frequency), producing a lower pitch.

- Thin strings → faster vibrations → higher pitch
- Thick strings → slower vibrations → lower pitch

This principle applies to musical instruments like guitars or violins.

✔ So, B is correct.

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✘ Summary of Errors:

- Question 4 (Easy) has an incorrect answer marked: C is listed, but the correct answer should be B ("Make food for the cell").

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✔ Final Answers with Corrections:

| Question | Correct Answer | Explanation |
|--------|----------------|-----------|
| 1 | C | Solute is the smaller component in a solution |
| 2 | B | Formula of CaCl₂ includes Ca and Cl |
| 3 | A | Root and shoot systems work together for growth and survival |
| 4 | B (not C) | Chloroplasts make food via photosynthesis |
| 5 | B | Fertilization forms a zygote |
| Average 1 | B | Thicker strings = lower pitch |

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If this is a quiz being used for teaching, it’s recommended to correct Question 4 to avoid misleading students.

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