Which of the following organelles is surrounded by a single membrane? MCQ with Answer and Explanation

Explanation:
Cellular respiration breaks down glucose and other nutrients in the presence of oxygen to produce ATP. Photosynthesis builds glucose, fermentation is anaerobic energy production, transpiration is water loss.

Explanation:
Immunoglobulin A (IgA) is the primary antibody found in mucosal secretions, including saliva, tears, nasal secretions, breast milk (colostrum), and the respiratory and gastrointestinal tracts. It plays a crucial role in mucosal immunity by preventing the attachment of pathogens to epithelial cells, a process known as immune exclusion. IgG is the most abundant in blood, IgM is the first to be produced in an infection, and IgE is involved in allergies.

Explanation:
Guttation occurs when root pressure forces water out through special pores (hydathodes) at leaf tips/margins, forming droplets, usually at night or early morning. Transpiration is vapor loss, evaporation from wet surfaces, precipitation is rain.