Which of the following is considered the defining property of living organisms? MCQ with Answer and Explanation

Explanation:
In angiosperms, the pollen tube must enter the ovule to deliver the male gametes to the embryo sac. The most common and typical pathway is through the micropyle (the small opening at the tip of the integuments), which is called porogamy. In some plants (like Casuarina, Juglans), the pollen tube enters through the chalaza (the base of the nucellus), which is called chalazogamy. Entry through the integuments is called mesogamy. Apogamy is the formation of a sporophyte without fertilization.

Explanation:
Iodine solution (iodine in potassium iodide) gives a blue-black color with starch due to the formation of a polyiodide chain complex with amylose. Benedict's tests for reducing sugars, Biuret for proteins, Sudan III for lipids. The iodine test is specific and sensitive for starch.

Explanation:
Histoplasmosis is a respiratory fungal infection caused by inhaling spores of Histoplasma capsulatum, often found in bird or bat droppings. It can be severe in immunocompromised.