Consider the following statements about blood: 1. Red blood cells transport oxygen. 2. White blood cells are involved in immunity. 3. Platelets help in blood clotting. Which of the above is/are correct? MCQ with Answer and Explanation

Explanation:
Auxin produced at the shoot apex inhibits lateral bud growth, a phenomenon called apical dominance. Removing the tip promotes branching.

Explanation:
The cardiac conduction system ensures coordinated heartbeats. The sinoatrial (SA) node generates the electrical impulse, acting as the natural pacemaker. The impulse reaches the atrioventricular (AV) node, which delays it slightly to allow the atria to fully contract and empty into the ventricles. The impulse then travels down the Bundle of His to the Purkinje fibers, which rapidly distribute it throughout the ventricular myocardium, causing ventricular contraction. All statements are correct.

Explanation:
DNA replication is semiconservative, producing two identical copies from a template. Transcription makes RNA, translation makes protein.