Presentation is loading. Please wait.
Published byJustina McKenzie Modified over 7 years ago
Plant Structure & Function
Main Plant Tissues Dermal Tissue - covers the outside of the plant & protects it –May produce a waxy coating to prevent water loss Ground Tissue - inside the dermal tissue; provides support, stores materials, & is the site of photosynthesis Vascular Tissue - transports water & nutrients throughout the plant –Xylem transports water –Phloem transports food
Plant Tissues See fig. 21.2 on pg. 642
Roots Roots anchor plants & absorb mineral nutrients & water from the soil Parts: –Vascular cylinder in center of root –Root hairs increase surface area to absorb water & nutrients –Root cap protects the growing part of the root –Meristem is where growth occurs
Root Structure See fig.21.7 on pg. 648
Stems Stems support plants, transport materials, & provide storage Primary growth takes place in apical meristems & makes stems grow taller Secondary growth takes place in lateral meristems & adds to the width of the stem
Stem Growth See pg.651
Leaves Leaves collect sunlight for photosynthesis The top of a leaf contains most of the chloroplasts & is where most photosynthesis takes place The underside of a leaf is the site of transpiration & gas exchange –Gases are exchanged through openings called stomata, which are opened & closed by surrounding cells called guard cells
Stomata & Guard Cells Fig. 21.12on pg. 652Fig. 21.12on pg. 652
Angiosperms & Gymnosperms Angiosperms are flowering plants –Some flowers are strictly male OR female, some contain both male AND female reproductive structures –Fertilization produces seeds which are contained within a fruit Gymnosperms are cone-bearing plants –Male cones produce pollen, female cones contain ovules to be fertilized –Fertilization produces seeds which are contained in the scales of the cones
Flowers Flowers contain sepals and petals, which are often brightly colored to attract pollinators The stamen is the male part –Filament supports the anther –Anther produces pollen grains The pistil is the female part –Stigma is at the top & collects pollen –Style is the tube leading from the stigma to the ovary –Ovary is where the egg cells are located
Parts of a Flower Fig. 22.5 on pg. 668
Reproduction of Flowering Plants (Angiosperms) Flowers can either self-fertilize or pollen can be carried to another flower to fertilize When pollen fertilizes the egg cells, seeds form The ovary grows to become a fruit surrounding the seeds Fruit aids in the dispersal of seeds to new areas
Reproduction of Conifers (Gymnosperms) Male cones release pollen, which is carried by the wind to female cones Ovules within the scales of the female cones are fertilized and seeds develop Gymnosperm means “naked seed”
© 2023 SlidePlayer.com Inc.
All rights reserved.