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How far does Selaginella one of the living members of Lycopodiales (pteridophytes ) fall short of seed habit?

Wha is menat by free energy of a system? How is it related to enthalpy and entropy of the system? How is it useful for predicting the feasibility of a process?

How do organisms like fungi, zooplanktons and bears overcome the temporary short-lived climatic stressful conditions? Explain.

Use of potentiometer to measure the internal resistance of a cell. (i) When the key K is open, how does the balance point change,if the current from the driver cell decreases ? (ii) When the key K is closed, how does the balance point change if R us increased, keeping the current from the driver cell constant ?

How do potential energy and K.E. of a spring vary with displacement ? Is this variation different from variation in potential energy and K.E. of a body in free fall ?

A metal 'M' is found in nature as its carbonate. It is used in the galvanization of iron. Identify 'M' and name its ore. How will you convert this ore into free metal ?