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  Homeostasis in Humans – 25 Most Important and Repeated MCQs with Answers Homeostasis is the process through which the human body maintains a stable internal environment despite changes in the external environment. It involves excretion, osmoregulation, temperature regulation, and hormonal balance . For exam preparation (like MDCAT, PPSC, and other biology tests), here are 25 most important and repeated MCQs on Homeostasis in Humans with answers. MCQs on Homeostasis in Humans 1. The process of maintaining a stable internal environment in the body is called: a) Metabolism b) Homeostasis c) Assimilation d) Anabolism ➡️ Answer: b) Homeostasis 2. The functional unit of the kidney is: a) Alveolus b) Nephron c) Neuron d) Bowman’s capsule ➡️ Answer: b) Nephron 3. Which organ plays the main role in excretion of nitrogenous waste? a) Liver b) Lungs c) Kidney d) Skin ➡️ Answer: c) Kidney 4. In humans, urea is formed in the: a) Kidney b) Liver c) Lungs d) Hear...

  Homeostasis in Plants – Most Important MCQs with Answers Homeostasis in plants refers to the ability of plants to maintain stable internal conditions such as water balance, gas exchange, and temperature regulation despite changes in the environment. This concept is highly important for exam preparation (MDCAT, PPSC, NEET, USMLE, etc.). Below are the 25 most repeated and important MCQs with answers. ✅ Multiple Choice Questions on Homeostasis in Plants 1. Which process helps plants maintain water balance? A) Photosynthesis B) Transpiration C) Respiration D) Osmosis Answer: D) Osmosis 2. The opening and closing of stomata is controlled by: A) Root hairs B) Guard cells C) Xylem D) Phloem Answer: B) Guard cells 3. Which plant hormone induces stomatal closure during drought stress? A) Auxin B) Gibberellin C) Cytokinin D) Abscisic Acid (ABA) Answer: D) Abscisic Acid (ABA) 4. In xerophytes, water loss is reduced mainly by: A) Large intercellular spaces B) Sunken ...