Sperm is acidic in nature otherwise sperm could not be able to survive because when sperm is released before that cowper's gland and prostate gland secrete alkaline fluid which is very much essential for lubrication of of urinary tract so that the acidity effect of urine can be neutralize and sperm could be able to come out without degradation because sperm can't survive in the acidic medium
When 2 molecules unite without any elimination of smaller particle is called condensation.n hence the reaction got name e.g in aldol condensation there is formation of aldol which is alpha hydroxy aldehyde /ketone without any elimination and OH- which used initially given out in last.
Aldehyde/ketones having alpha hydrogen in presence of dilute base give aldol condensation reaction.Whereas ESTER having alpha hydrogen in presence of dilute base undergoes claisen condensation reaction.
OH- is used as catalyst in aldol condensation reaction.this reaction is given by aldehyde/ ketone having alpha hydrogen in presence of dilute base gives alpa hydroxy aldehyde/ketone.oh- act as base used first n in last step it exists .hence act as catalyst.
Since Blue green algae is prokaryotic organism ,it lacks true nucleas and membrane bound cell organelle .The peripheral region of BGA protoplast contains thylakoid.Thylakoids (Lamillisomes) contain photosynthetic pigments (chrolophyll a, xanthophylls, phycobilin) in their membranes and serve as site for photosynthesis. Hence opt B is correct
Thallium is found as a mineral in the elements crooksite, lorandite and hutchinsonite. It's also found as a trace element in iron pyrite and obtained from this ore by roasting the mineral. Small amounts of thallium are found in manganese nodules on the ocean floor.
I guess exam will be held on time ,bz the news has circulated the media that admit cards for Jee exams will be released very soon ,may be tomorrow, so we neet aspirants can also assume that our admit cards will also be released and exams may be held on time,anyways we shouldn't pay heed to any false rumours and we should keep our preparation going on .