Educational worksheet with science questions on photosynthesis, heat, plant nutrition, and thermometers.

Let's solve each question one by one and provide explanations.

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SECTION A

FILL IN THE BLANKS

1. The presence of ________ in leaves indicates the occurrence of photosynthesis.

✔ Answer: *Starch*

🔹 Explanation: During photosynthesis, plants produce glucose, which is then converted into starch for storage. Starch can be tested using iodine solution (turns blue-black), so its presence confirms that photosynthesis has occurred.

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2. Substance that do not conduct heat are called ________.

✔ Answer: *Insulators*

🔹 Explanation: Insulators are materials that resist the flow of heat. Examples include wood, plastic, rubber, and air.

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3. Temperature is measured in degree ________.

✔ Answer: *Celsius* (or *Centigrade*)
(Other acceptable answers: Fahrenheit or Kelvin — but usually in school-level science, Celsius is expected.)

🔹 Explanation: Temperature is commonly measured in degrees Celsius (°C), though Fahrenheit (°F) and Kelvin (K) are also used in different contexts.

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4. Plants getting nutrition from dead and decaying matter are called ________.

✔ Answer: *Saprophytes*

🔹 Explanation: Saprophytic plants obtain nutrients from dead and decaying organic matter. They secrete digestive enzymes and absorb nutrients. Example: *Mushrooms* (though technically fungi, they are often discussed alongside such plants).

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WRITE - TRUE OR FALSE

5. Heat energy flows from one body to another due to temperature difference between the two bodies.

✔ Answer: *True*

🔹 Explanation: Heat always flows from a hotter object to a colder one until thermal equilibrium is reached. This is a fundamental principle of thermodynamics.

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6. The fluid at the bottom of the pitcher plant contains digestive juices that digest the insects.

✔ Answer: *True*

🔹 Explanation: Pitcher plants are carnivorous and trap insects in their modified leaves. The fluid inside contains digestive enzymes that break down the insect’s body to absorb nutrients like nitrogen.

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7. The clinical thermometer does not have kink near the mercury bulb.

✔ Answer: *False*

🔹 Explanation: Clinical thermometers do have a kink (a narrow constriction) near the mercury bulb. This prevents the mercury from falling back immediately after removal, allowing the user to read the temperature even after taking it out of the body.

> 🔍 So, saying "does not have kink" is false.

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8. Manures and fertilizers are used to replenish the nutrients in the soil.

✔ Answer: *True*

🔹 Explanation: Manures (organic) and fertilizers (inorganic) add essential nutrients (like nitrogen, phosphorus, potassium) to the soil, improving fertility and supporting plant growth.

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✔ Final Answers:

| Q.NO | Answer |
|------|--------|
| 1 | Starch |
| 2 | Insulators |
| 3 | Celsius |
| 4 | Saprophytes |
| 5 | True |
| 6 | True |
| 7 | False |
| 8 | True |

Let me know if you'd like this formatted as a printable answer sheet!