Majority of pteridophytas are homosporous i.e. they produce similar kind of spores. Give one example of a heterosporus pteridpphyte.

The modern theory of aromaticity was advanced by E. Huckel : Give one example of heterocyclic aromatic compound and two examples of cyclic icons which are aromatic

In some lower and higher plants offspring are produced shows greater similarity and it occurs mainly through asexual reproduction,in higher plants the process ocuurs through vegetative propagation. a) What is vegetative propagation? b) Give two suitable examples.

Read the following statements and find out the incorrect statements. a. Ovules generally differentiate a single megaspore mother cell (MMC) in the chalazal region of the nucellus. b. The MMC undergoes reduction division and produces four megaspores. c. In a majority of angiosperms, one of the megaspore is degenerated while the other three remains functional. d. The nucleus of the functional megaspore divides mitotically three times and form 2-nucleate, 4-nucleate and later 8-nucleate stages of the embryo sac. e. These mitotic division are strictly free nuclear, that is, nuclear division are immediately followed by cell wall formation.

Lithium and Magnesium belong to 1st and 2nd groups in the periodic table. They resemble each other in many respects.(i) Name such relationship.(ii) Give any one similarity between Li and Mg.