for variable. periods. The developmtent of the fygotes into youthp thein thie thaies the seed habit consiclered an important step in evolutins
The pteridophytes are further classified into four classes: Psilg, cells of the n (Psilotum): Lycopsida (Selaginella, Lycopodium). Sphenopsida (Equb. lopes and and Pteropsida (Dryopteris, Pteris, Adiantum.
3.4 GYMNOSPERMS
The gymnosperms (gymnos : naked, sperma: seeds) are plants in whastophyte the ovules are not enclosed by any ovary wall and remain exposed, pale sex or before and after fertilisation. The seeds that develop post-fertilisation so retair not covered, i.e., are naked. Gymnosperms include medium-sized, Unlike or tall trees and shrubs (Figure 3.4). One of the gymnosperms, the ginospel redwood tree Sequoia is one of the tallest tree species. The roots lot hav generally tap roots. Roots-in some genera have fungal association in form of mycerriziza (Pinus). while in some others (Cycas) small speciaf rophy roots called cacalloid roots are associated with N2 - fixing cyanobacte rosp in The stems are unbranched ( Cycas) or branched (Pinus, Cedrus). The lest ine may be simple or compound. In Cycas the pinnate leaves persist for afe g years. The leaves in gymnosperms are well-adapted to withstand extrem d of temperature, humidity and wind. In conifers, the needle-like leathe reduce the surface area. Their thick cuticle and sunken stomata a help to reduce water loss.

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for variable. periods. The developmtent of the fygotes into youthp thein thie thaies the seed habit consiclered an important step in evolutins
The pteridophytes are further classified into four classes: Psilg, cells of the n (Psilotum): Lycopsida (Selaginella, Lycopodium). Sphenopsida (Equb. lopes and and Pteropsida (Dryopteris, Pteris, Adiantum.
3.4 GYMNOSPERMS
The gymnosperms (gymnos : naked, sperma: seeds) are plants in whastophyte the ovules are not enclosed by any ovary wall and remain exposed, pale sex or before and after fertilisation. The seeds that develop post-fertilisation so retair not covered, i.e., are naked. Gymnosperms include medium-sized, Unlike or tall trees and shrubs (Figure 3.4). One of the gymnosperms, the ginospel redwood tree Sequoia is one of the tallest tree species. The roots lot hav generally tap roots. Roots-in some genera have fungal association in form of mycerriziza (Pinus). while in some others (Cycas) small speciaf rophy roots called cacalloid roots are associated with N2​ - fixing cyanobacte rosp in The stems are unbranched ( Cycas) or branched (Pinus, Cedrus). The lest ine may be simple or compound. In Cycas the pinnate leaves persist for afe g years. The leaves in gymnosperms are well-adapted to withstand extrem d of temperature, humidity and wind. In conifers, the needle-like leathe reduce the surface area. Their thick cuticle and sunken stomata a help to reduce water loss.

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Question Text	for variable. periods. The developmtent of the fygotes into youthp thein thie thaies the seed habit consiclered an important step in evolutins The pteridophytes are further classified into four classes: Psilg, cells of the n (Psilotum): Lycopsida (Selaginella, Lycopodium). Sphenopsida (Equb. lopes and and Pteropsida (Dryopteris, Pteris, Adiantum. 3.4 GYMNOSPERMS The gymnosperms (gymnos : naked, sperma: seeds) are plants in whastophyte the ovules are not enclosed by any ovary wall and remain exposed, pale sex or before and after fertilisation. The seeds that develop post-fertilisation so retair not covered, i.e., are naked. Gymnosperms include medium-sized, Unlike or tall trees and shrubs (Figure 3.4). One of the gymnosperms, the ginospel redwood tree Sequoia is one of the tallest tree species. The roots lot hav generally tap roots. Roots-in some genera have fungal association in form of mycerriziza (Pinus). while in some others (Cycas) small speciaf rophy roots called cacalloid roots are associated with $N_{2}$ - fixing cyanobacte rosp in The stems are unbranched ( Cycas) or branched (Pinus, Cedrus). The lest ine may be simple or compound. In Cycas the pinnate leaves persist for afe g years. The leaves in gymnosperms are well-adapted to withstand extrem d of temperature, humidity and wind. In conifers, the needle-like leathe reduce the surface area. Their thick cuticle and sunken stomata a help to reduce water loss.
Updated On	Oct 4, 2022
Topic	Structural Organisation in Plants and Animals
Subject	Biology
Class	Class 12
Answer Type	Video solution: 1
Upvotes	58
Avg. Video Duration	6 min

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