The hormone that increases the heart rate and blood pressure in stress is: MCQ with Answer and Explanation

Explanation:
Transformation involves the uptake and incorporation of naked DNA fragments from the surrounding medium by competent bacteria. Conjugation requires cell-to-cell contact via a pilus, transduction is gene transfer by bacteriophages, binary fission is asexual reproduction. Griffith's experiment demonstrated transformation.

Explanation:
The pineal gland is a small endocrine gland in the brain that secretes melatonin, a hormone that regulates circadian rhythms and sleep-wake cycles. Melatonin production is influenced by light exposure: it increases in darkness and decreases in light. The pituitary is the master gland, thyroid regulates metabolism, adrenal secretes adrenaline.

Explanation:
Cholera is an acute diarrheal disease caused by the bacterium Vibrio cholerae, typically transmitted through contaminated water and food. Polio (poliomyelitis) is a highly infectious viral disease caused by the poliovirus, which can invade the nervous system and cause paralysis. Ringworm (dermatophytosis) is a common superficial fungal infection of the skin, hair, or nails caused by dermatophytes like Microsporum, Trichophyton, and Epidermophyton. All three statements correctly identify the causative agents.