Highly Resistant nature of endospore is due to the presence of... a) Dipicolinic acid and Ca2+ in Cortex or b) Cell membrane..... ???. answer with reason

The highly resistant nature of endospore is due to the presence of all of these :-

(i) Thick and impermeable spore coat
(ii) Low water content
(iii) Low metabolic activity
(iv) Calcium Dipicolinic acid (Ca-DPA complex)

Under favourable conditions, endospore absorbs water, becomes metabolically active, ruptures thick spore coat and the bacterium surrounded by thin cell wall emerges out.


Hope this will help...