Explanation

• The movement of water from higher water potential to lower water potential is called osmosis.
• It occurs through a semi-permeable membrane.
• Only water molecules move in osmosis.
• It is a passive process (no energy required).

Last verified on 18-06-2026

Explanation

• Macronutrients are the nutrients that are needed in the highest concentration by living organisms.
• They include carbohydrates, proteins, and fats, which provide energy and support growth and maintenance of tissues.

Last verified on 08-11-2026

Explanation

• Guard cells are specialized cells that surround each stoma and regulate its opening and closing.
• When guard cells absorb water and become turgid, the stomata open.
• When guard cells lose water and become flaccid, the stomata close.
• This process regulates gas exchange and water loss through transpiration.

Last verified on 08-11-2026

Explanation

• Vitamin K is essential for the production of blood-clotting proteins.
• Its deficiency reduces the blood's ability to clot, causing prolonged bleeding.
• It may lead to easy bruising, nosebleeds and excessive bleeding from wounds.
• Vitamin K is found in green leafy vegetables such as spinach, kale and broccoli.

Last verified on 02-11-2026

Explanation

• Observation is the first step in the scientific method, which is used to solve biological problems.
• Scientists make observations about the natural world, notice patterns or phenomena, and ask questions about what they have observed.

The correct order of the scientific method is:

• Observation
• Question
• Hypothesis
• Prediction
• Experimentation
• Data analysis
• Conclusion

Last verified on 28-10-2026