The scientist who discovered the bacterium that causes tuberculosis is: MCQ with Answer and Explanation

Explanation:
The Competitive Exclusion Principle, formulated by G.F. Gause based on his experiments with Paramecium, states that two species with identical ecological niches (competing for the exact same limited resources) cannot coexist indefinitely in the same habitat. One species will inevitably have a slight reproductive advantage and will outcompete the other, leading to the local extinction or evolutionary shift (resource partitioning) of the inferior competitor.

Explanation:
The neuron is the nerve cell, the fundamental unit of the nervous system, responsible for receiving, processing, and transmitting electrochemical signals. It consists of a cell body (soma), dendrites, and axon. Axon and dendrite are parts of a neuron. Nephron is the unit of kidney. Neurons communicate via synapses using neurotransmitters.

Explanation:
B-lymphocytes (B cells) differentiate into plasma cells that secrete antibodies, providing humoral immunity. T-lymphocytes (T cells) are responsible for cell-mediated immunity, directly attacking infected or cancerous cells. Vaccines are prophylactic; they stimulate the immune system to develop memory and prevent future infections, but they do not cure active, ongoing viral infections. Thus, statements 1 and 2 are correct.