Differentiate between Mnetaphse-I and Metapase-II. State the role of meiosis in genration of variation.

State the features of Meiosis II.

(a) Draw a labelled diagram of a sectional view of humen seminiferous tubule. (b) Differentiate between gametogenesis in humen males and females on the basis of (i) time of initation of the process. (ii) Products formed at the end of the process.

State the general role of Ca, P, Fe, I and N.

Differentiate between the following:- (i) red algae and brown algae (ii) liverworts and moss (iii) homosporous and heterosporous pteridophyte (iv) syngamy and triple fusion

Meiosis II fails after completion of meiosis I. The phenomenon is

This question has Statement I and Statement II. Of the four choices given after the Statements, choose the one that best describes the two Statements. Statement -1 :At critical state the meniscus between gas and liquid disappears. Statement - II : Surface tension of liquid is zero at critical state.

(i) What is the difference betweenn the enthalpy of formation and the enthalpy of reaction? Explain with proper explain. (ii) what do you understand by the standard state of liquid benzene at 25^(@)C ?

A short phase may intervene between Meiosis I and Meiosis II. It is called

Mention of role of : (i) NO, (ii) CFC in the formation of ozone hole.