Which hormone regulates water reabsorption in the kidney collecting ducts? MCQ with Answer and Explanation

Explanation:
Lymph is interstitial fluid that has entered lymphatic capillaries. When lymph vessels are blocked (e.g., filariasis), lymph accumulates, causing swelling (lymphedema). Plasma is blood fluid, synovial in joints, serum is plasma without clotting factors.

Explanation:
The stratospheric ozone layer acts as a vital shield, absorbing the majority of the sun's harmful ultraviolet (UV-B and UV-C) radiation, protecting life on Earth. Greenhouse gases (like CO2, methane, water vapor) absorb and re-emit infrared radiation, trapping heat in the troposphere and maintaining Earth's temperature (the greenhouse effect). Acid rain, containing sulfuric and nitric acids, is highly detrimental; it leaches essential nutrients from the soil, releases toxic aluminum, and damages plant life, reducing soil fertility. Thus, statements 1 and 2 are correct.

Explanation:
Reflex actions are rapid, involuntary responses to stimuli, primarily coordinated by the spinal cord without immediate brain involvement. The reflex arc includes receptor, sensory neuron, interneuron (in spinal cord), motor neuron, and effector. The brain is later informed. Examples: withdrawal of hand on touching a hot object. The medulla controls autonomic functions like breathing. The cerebrum handles conscious thought, cerebellum coordination.