The conversion of milk to curd is primarily caused by which microorganism?
A. Lactobacillus
B. Saccharomyces cerevisiae
C. Penicillium notatum
D. Aspergillus niger
Answer: Option A
Solution (By JKSSB Mock Tests)
The conversion of milk to curd (yogurt) is a fermentation process primarily caused by lactic acid bacteria (LAB), such as Lactobacillus. These bacteria ferment the lactose (milk sugar) into lactic acid. The lactic acid lowers the pH, causing the milk protein (casein) to coagulate and solidify, forming curd. It also improves the nutritional value by producing Vitamin B12.
Explanation:
Skeletal muscle, attached to bones, is striated and under conscious (voluntary) control. Smooth and cardiac muscles are involuntary. Skeletal muscles are responsible for locomotion and posture.
Explanation:
The loop of Henle creates a concentration gradient in the medulla, enabling water reabsorption and concentrated urine. Urine is formed in kidneys, the unit is nephron, ureter connects kidney to bladder.
Explanation:
The thymus gland is a primary lymphoid organ where T lymphocytes mature and become self-tolerant. Bone marrow is where B cells mature; spleen and lymph nodes are secondary.
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