King, let's knock this out.

1. (a)

• A: Cotton fruit
• B: Mango
• C: Maize grain

1. (b)

• I: Protects the seed
• II: Stores food for the germinating seedling
• IV: Develops into a new plant

1. (c)

• A. i. Has hairy outgrowths (tufts) that catch the wind. ii. Light in weight.
• B. i. Has fleshy, sweet pulp that attracts animals. ii. Has a hard stone (endocarp) that protects the seed from being digested.
• C. i. Light in weight. ii. Small in size.

2. (a)

• A: No change; the balloon remains flat.
• B: No change; the balloon remains flat.
• C: The balloon inflates.
• D: No change; the balloon remains flat.

2. (b)

• B: The water was boiled, which killed the yeast cells, so no fermentation occurred and no gas was produced.
• C: The yeast was alive and active in warm water with sugar, so it fermented the sugar and produced carbon dioxide gas which inflated the balloon.
• D: The ice-cold water lowered the temperature, so the yeast became inactive and no fermentation occurred.

2. (c)

• Carbon dioxide gas

2. (d)

• Pass the gas into limewater. If it turns milky, it confirms the presence of carbon dioxide.

2. (e)

• Flask A