1. You observe that plants in a greenhouse grow faster when exposed to red light compared to blue light. What is the next best step in your investigation?

A. Increase the intensity of the blue light.
B. Decrease the intensity of the red light.
C. Grow plants in complete darkness.
D. Grow plants exposed to both red and blue light at equal intensities.

Correct answer: D

Rationale: The next best step in the investigation would be to grow plants exposed to both red and blue light at equal intensities. This will help determine if the observed growth difference is due to the specific wavelength of light (red vs. blue) or if it is related to the intensity of light. By exposing plants to both red and blue light at equal intensities, you can compare their growth rates and determine if one wavelength has a greater effect on plant growth.

2. Where should a semicolon be placed in the following sentence? "He loves reading comics, playing video games, and spending time with friends"?

A. He loves reading comics; playing video games, and spending time with friends.
B. He loves reading comics, playing video games; and spending time with friends.
C. He loves reading comics, playing video games and spending time with friends.
D. No semicolon needed.

Correct answer: B

Rationale: Semicolons can join three or more items in a list, especially when the items themselves contain commas. Option (b) is the correct placement.

3. What is the meaning of the idiom "to cross that bridge when we come to it"?

A. To deal with a problem immediately
B. To plan for the future in detail
C. To worry about potential problems prematurely
D. To avoid difficult situations

Correct answer: C

Rationale: The idiom suggests dealing with challenges as they arise, not before.

4. Rectangle: A picture frame measures 15cm by 20cm. What is its perimeter?

A. 30cm
B. 55cm
C. 65cm
D. 75cm

Correct answer: C

Rationale: Add the lengths of all sides: perimeter = 2 (length + width) = 2 (15cm + 20cm) = 65cm.

5. Which of the following is a MAJOR consequence of a stroke?

A. Irregular heart rhythm.
B. Rapid weight gain or loss.
C. Brain damage due to interrupted blood flow.
D. Chronic fatigue and muscle weakness.

Correct answer: C

Rationale: The correct answer is C: 'Brain damage due to interrupted blood flow.' A stroke occurs when there is a sudden interruption in the blood supply to the brain, leading to brain damage. This interruption can result in various consequences such as paralysis, speech and vision problems, cognitive impairments, and in severe cases, even death. Other options like 'Irregular heart rhythm' (A) and 'Chronic fatigue and muscle weakness' (D) can be associated with health conditions but are not direct consequences of a stroke. 'Rapid weight gain or loss' (B) is typically not a major consequence of a stroke compared to the significant impact of brain damage.