Biology Chapter 35 and 39 Notes
Chapter 39
Plant Responses to Internal and External Signals
No groups of plants is more important to human survival than seed plants plants are key sources of food fuel wood products and medicine our reliance of plants
Products from Seed Plants
Most of our food comes from angiosperms
Six crops yield 80% of the calories consumed by humans
Wheat
Rice
Maize
Potatoes
Cassava sweet potatoes
Other Products from Seed Plants
Secondary compounds of seed plants are used in medicines
Know table 30.1
Threats to plant Diversity
Destruction of habitat
In causing extinction of many plant speciesCHapter 35
Plant structure, Growth, and Development.
Overview no two plants are alike
To some people the fanwort is an intrusive weed but to others it is an attractive aquarium plant
Fanwort exhibits plasticity, the ability to alter itself in response to its environment.
Plant Anatomical Organization
Plants like animals, have systems composed of organs
The two plant systems are:
Shoot
Root
The organs found in both systems are:
roots, stems, and leaves
Roots
Functions of roots:
Anchoring the plant absorbing minerals and water storing organic nutrients and other functions
Absorption of water and minerals occurs near the root tips, where root hairs increase the surface area.
Many plants have modified roots:
Prop roots in mangrove
Tubers in sweet potato and cassava
Tubers are enlarge root or stem that acts as nutrient storage
Aerial roots of the strangler fig tree
Strangler fig use their roots to strangle their host to death
Buttress roots large above ground roots surrounding the tree help to stabilize tall and large trees tropical trees generally have shallow roots due to poor nutrient soil.
Pneumatophore roots of mangroves and bald cypress
Help in gas exchange in habitats where roots are often submerge under water.
Toxic roots roots of the common reed P australis secretes
Stems
A stem is the
Plant Responses to Internal and External Signals
No groups of plants is more important to human survival than seed plants plants are key sources of food fuel wood products and medicine our reliance of plants
Products from Seed Plants
Most of our food comes from angiosperms
Six crops yield 80% of the calories consumed by humans
Wheat
Rice
Maize
Potatoes
Cassava sweet potatoes
Other Products from Seed Plants
Secondary compounds of seed plants are used in medicines
Know table 30.1
Threats to plant Diversity
Destruction of habitat
In causing extinction of many plant speciesCHapter 35
Plant structure, Growth, and Development.
Overview no two plants are alike
To some people the fanwort is an intrusive weed but to others it is an attractive aquarium plant
Fanwort exhibits plasticity, the ability to alter itself in response to its environment.
Plant Anatomical Organization
Plants like animals, have systems composed of organs
The two plant systems are:
Shoot
Root
The organs found in both systems are:
roots, stems, and leaves
Roots
Functions of roots:
Anchoring the plant absorbing minerals and water storing organic nutrients and other functions
Absorption of water and minerals occurs near the root tips, where root hairs increase the surface area.
Many plants have modified roots:
Prop roots in mangrove
Tubers in sweet potato and cassava
Tubers are enlarge root or stem that acts as nutrient storage
Aerial roots of the strangler fig tree
Strangler fig use their roots to strangle their host to death
Buttress roots large above ground roots surrounding the tree help to stabilize tall and large trees tropical trees generally have shallow roots due to poor nutrient soil.
Pneumatophore roots of mangroves and bald cypress
Help in gas exchange in habitats where roots are often submerge under water.
Toxic roots roots of the common reed P australis secretes
Stems
A stem is the