In the human body, the 'Thymus gland' is most active during childhood and plays a crucial role in the maturation of: MCQ with Answer and Explanation

Explanation:
An Electrocardiogram (ECG or EKG) is a graphical record of the heart's electrical activity. The 'P' wave represents the depolarization of the atria, which leads to atrial contraction. The QRS complex represents ventricular depolarization, and the 'T' wave represents ventricular repolarization, which leads to ventricular relaxation.

Explanation:
DNA fingerprinting analyzes unique patterns in an individual's DNA (VNTRs) and is widely used in forensics for identifying criminals or establishing paternity. Human insulin (Humulin) was the first genetically engineered therapeutic protein, produced in E. coli in 1982. Bt brinjal is genetically modified to express Bt toxin for resistance against specific insect pests (like the fruit and shoot borer), not herbicides. Thus, statements 1 and 2 are correct.

Explanation:
According to Lindeman's 10% law, only about 10% of the energy from one trophic level is transferred to the next; the rest is lost as heat through respiration. Producers (Trophic Level 1) have 10,000 kcal. Primary consumers (Level 2) get 10% of 10,000 = 1,000 kcal. Secondary consumers (Level 3) get 10% of 1,000 = 100 kcal. Tertiary consumers (Level 4) get 10% of 100 = 10 kcal.