STD 11 - 5. Morphology flowering plants — NEET STD 11 Science — Question

Reproduction means....

Cellulose, starch and glycogen are the polysaccharides having.......monosaccharide unit:

Divergent multicostate reticulate venation is found in leaves of

Read the following statements :
(i) All events-from pollen deposition on the stigma until pollen tubes enter the ovule-are together referred to as pollen-pistil interaction.
(ii) Pollen-pistil interaction is a dynamic process involving pollen recognition followed by promotion or inhibition of the pollen.
(iii) Artificial hybridisation is achieved by emasculation and bagging techniques.
(iv) Removal of anthers from the flower bud before the anther dehisces referred to as bagging.
(v) Since two types of fusions, syngamy and triple fusion take place in an embryo sac the phenomenon is termed double fertilisation.
Of above statements which one is correct ?

Physiological heterospory is seen in

Selaginella and Salvinia are considered to represent a significant step toward evolution of seed habit because