Explanation:
(d)The leaves in gymnosperms are well adapted to withstand extremes of temperature, humidity and wind. In conifers, the needle like leaves reduces surface area. Their thick cuticle and sunken stomata also help to reduce water loss.
Q 37. The heterosporous pteridophyte belonging to the class lycopsida is #[examname: NCERT Page-38 / N-32]#
(a.) Selaginella
(b.) Psilotum
(c.) Equisetum
(d.) Pteris
Ans: a
Exp: (a) Selaginella is a member of lycopsida, which produce two kinds of spores-macro (large) and micro (small) spores. Thus, known as heterosporous pteridophytes.
Q 38. Which of the following pteridophytes belong to class pteropsida? #[examname: NCERT Page-38 / N-32]#
(a.) Equisetum and Psilotum
(b.) Lycopodium and Adiantum
(c.) Selaginella and Pteris
(d.) Pteris and Adiantum
Ans: d
Exp: (d)Pteridophytes are classified into four classes: Psilopsida (Psilotum), Lycopśida (Selaginella, Lycopodium), Sphenopsida (Equisetum) and Pteropsida (Dryopteris, Pteris, Adiantum).