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

Explanation

• Newton’s First Law of Motion is also called the Law of Inertia.
• It states that an object remains at rest or continues moving at a constant velocity in a straight line unless acted upon by an unbalanced external force.
• Inertia is the tendency of an object to resist changes in its state of rest or motion.
• Proposed by: Sir Isaac Newton in Principia Mathematica (1687).

Last verified on 15-10-2026

Explanation

• Displacement is the straight-line change in position from an initial point to a final point.
• It is a vector quantity, having both magnitude and direction.

Last verified on 31-10-2026