Megasporangium

(i) Draw a diagram of a section of a megasporangium of a flowering plant and label funiculus, micropyle, nucellus and embryo sac in it. (ii) Name the organic material exine of the pollen grain is made up of. How is this material advantageous to the pollen grain?

(a) As a senior biology student you have been asked to demonstrate to the students of secondary level in your school, the procedure(s) that shall ensure cross-pollination in a hermaphrodite flower. List the different steps that you would suggest and provide reasons for each one of them. (b )Draw a diagram of a section of a megasporangium of and angiosperm and label funiculus, micropyle, embryosac and nucellus.

Which of these plants is correctly matched with its reproductive characteristics ? (i) Sphagnum : Male sex organ called antheridium produce biflagellate antherozoids while the female sex organ called archesporium produces a single egg . (ii) sequoia : One of the megaspores enclosed within the megasporangium develops into a multicellular female gametophyte that bears two or more archegonia or female sex organs (iii) Wolffia : one of the male gametes fuses with the egg cell to from a zygote while the other male gamete fuses with the diploid secondary nucleus to produce the triploid primary endosperm nuclelus . (iv) polysiphonia . Sexual reproduction is oogamous with non-motile gametes and accompanied by complex post-fertilization developments

Consider the following statements regarding gymnosperms and choose the correct option. (A) In gymnosperms, the male and female gametophytes have an independent existence (B) The multicullar female gametophyte is retained with in the megasporangium (C) The gymnosperms are hetersoporous of these statements

Consider the following statements regarding gymnosperms (A) In gymnospers, the male and female gametophytes have an independent existence (B) The multicellular female gametophyte is retained within the megasporangium (C) The gymnosperms are heterosporous Of these statements.

Consider the following statements regarding gymnosperms and choose the correct option I. In gymnosperms, the male and female gametophytes have an independent existence II. The multicellular female gametophyte is retained within the megasporangium III. All gymnosperms are heterosporous. Of these statements :