1. The ever evolving world of science

"Question" that leads to it.

• Answer: Because the cat’s teeth were crooked.

  • Question: Why did the kitten need to visit a veterinary orthodontist?

• Answer: Just add some milk.

  • Question: How can you make a cup of strong black tea taste smoother and look lighter?

• Answer: Don’t panic, I have my towel.

  • Question: What is the first thing you should say if you are caught in the rain without an umbrella but have a gym bag?

• Answer: 42.

  • Question: If you multiply the number of legs on a spider by five and then add two, what is the result?

Practice Questions & Answers

1. What does it mean to "think like a scientist"?

   Answer: It means being curious, asking "how" and "why" things happen, and being open to exploring the unknown.

2. Why is science considered an "ever-evolving" field?

   Answer: Because it is an ongoing process of discovery where new questions are constantly being asked and old ideas are refined.

3. What is the primary function of chlorophyll in plants?

   Answer: Chlorophyll captures the energy from sunlight to help plants prepare their own food.

4. Name the four essential requirements for photosynthesis.

   Answer: Chlorophyll, sunlight, carbon dioxide, and water.

5. How do plants obtain carbon dioxide from the air?

   Answer: They take it in through tiny pores on the surface of their leaves called stomata.

6. What is an autotroph?

   Answer: An organism, like a green plant, that can synthesize its own food from simple substances.

7. Define heterotrophs with an example.

   Answer: Organisms that cannot make their own food and must depend on plants or other animals for nutrition, such as humans or lions.

8. What happens to a turmeric stain when it is washed with soap?

   Answer: The stain turns red because of a chemical reaction between the turmeric and the soap.

9. What are insectivorous plants?

   Answer: Plants that supplement their nutrition by trapping and digesting insects, such as the Pitcher plant.

10. What is a "Physical Change"?

    Answer: A change where no new substance is formed, and the material usually retains its basic properties, like melting ice.

11. Define "Chemical Change."

    Answer: A change in which one or more new substances with different properties are formed, like burning wood.

12. What causes day and night on Earth?

    Answer: The rotation of the Earth on its own axis.

13. How long does it take for the Earth to complete one revolution around the Sun?

    Answer: Approximately 365 days (one year).

14. What is the relationship between fungi and algae in a lichen?

    Answer: They live in a symbiotic relationship where the fungus provides shelter and minerals, while the alga provides food.

15. Why do farmers add fertilizers to the soil?

    Answer: To replenish essential nutrients like nitrogen, potassium, and phosphorus that plants deplete during growth.

16. What is the role of Rhizobium bacteria in the soil?

    Answer: They convert atmospheric nitrogen into a soluble form that plants can easily absorb.

17. What can be used to test if a material is a conductor of electricity?

    Answer: A simple circuit consisting of a battery, a lamp, and connecting wires.

18. What is saprotrophic nutrition?

    Answer: A mode of nutrition where organisms take in nutrients from dead and decaying matter, such as fungi.

19. What are the tiny units that make up the bodies of living organisms?

    Answer: Cells.

20. Why is science important for a sustainable future?

    Answer: It helps us understand our impact on the environment and develop ways to protect the natural world for the future.