The phenomenon by which plants lose water in the form of liquid droplets through hydathodes is:
A. Guttation
B. Transpiration
C. Bleeding
D. Translocation
Answer: Option A
Solution (By JKExamLibrary)
Guttation is the exudation of water droplets containing dissolved salts from hydathodes at leaf margins, occurring under high humidity and low transpiration, due to root pressure. Transpiration is loss of water vapor through stomata. Bleeding is oozing of sap from cut plant parts. Translocation is transport of organic solutes. Guttation is visible as morning dew drops.
Explanation:
About 70% of CO₂ is transported as bicarbonate (HCO₃⁻) ions in plasma. CO₂ reacts with water in RBCs, catalyzed by carbonic anhydrase, to form carbonic acid, which dissociates into H⁺ and HCO₃⁻. The rest is bound to hemoglobin or dissolved. Bicarbonate is the major transport form.
Explanation:
Phenylketonuria (PKU) is an autosomal recessive disorder due to deficiency of phenylalanine hydroxylase, leading to accumulation of phenylalanine, causing mental retardation if untreated. Albinism is tyrosinase deficiency, sickle cell HbS mutation, cystic fibrosis CFTR defect.
Explanation:
Type 1 diabetes mellitus is an autoimmune disease where beta cells of the pancreas are destroyed, leading to little or no insulin production. Patients require insulin injections. Type 2 involves insulin resistance. Diabetes insipidus involves ADH deficiency, Cushing's syndrome is cortisol excess.
No comments yet. Be the first to start the discussion!