By Campbell, Reece
Biology: Nasta variation [Hardcover]
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Additional resources for Biology: Nasta Edition (PART 2 of 2)
E. stimulating the development of root hairs. 9. We would expect the greatest difference in plant health between two groups of plants of the same species, one group with mycorrhizae and one group without mycorrhizae, in an environment a. where nitrogen-fixing bacteria are abundant. b. that has soil with poor drainage. c. that has hot summers and cold winters. d. in which the soil is relatively deficient in mineral nutrients. e. that is near a body of water, such as a pond or river. 10. Carnivorous adaptations of plants mainly compensate for soil that has a relatively low content of a.
Hyphae also grow into the root cortex. These hyphae do not penetrate the root cells but form a network in the apoplast, or extracellular space, that facilitates nutrient exchange bem'een the fungus and the plant. Compared with "uninfected" roots, ectomycorrhizae are generally thicker, shorter, and more branched. They typically do not form root hairs, which would be superfluous given the extensive surface area of the fungal mycelium. About 10% of plant families have species that form ectomycorrhizae, and the vast majority of these species are woody, including members of the pine, spruce, oak, walnut, birch, willow, and eucalyptus families.
Only one cotyledon develops in monocots. Soon after the rudimentary cotyledons appear, the em~ bryo elongates. Cradled between the two cotyledons is the embryonic shoot apex, which includes the shoot apical meristem. At the opposite end of the embryo's axis, where the suspensor attaches, is the embryonic root apex, which includes the root apical meristem. 11). Seed coat 4~,-_~-Epicotyl l;j---+Hypocotyl Radicle ~--I -~>'Cotyledons (a) Common garden bean, a eudicot with thick cotyledons. The fleshy cotyledons store food absorbed from the endosperm before the seed germinates.
Biology: Nasta Edition (PART 2 of 2) by Campbell, Reece