Interactions Among Plant Biology 10B Systems Interactions Among

Interactions Among Plant Biology 10(B) Systems

Interactions Among Plant Systems Learning objectives • Identify major systems in plants • Describe the interactions that occur among systems to carry out vital plant functions

Plant Systems – Shoot system – aboveground – Root system – belowground Shoot system • Organ systems: – Dermal – barrier – Ground – metabolic functions – Vascular – transport Root system • Tissue systems: Tissues Dermal Ground Vascular

Interactions Among Plant Systems Organ and tissue systems interact to carry out vital functions • Transport • Reproduction • Response

Transport • Movement of needed materials throughout plant • Major function of vascular tissue – Xylem – transports water and minerals – Phloem – transports glucose – Both transport hormones

Interactions Among Plant Systems Interactions during transport • Root system – Absorbs water and minerals • Shoot system – Ground tissue produces glucose through photosynthesis • Both organ systems – Produce hormones – Vascular tissue transports all materials throughout the plant

Reproduction Vegetative propagation – offspring produced from part of a plant organ • Asexual Image by Roberto MM [GFDL] Pollination – offspring produced via pollinated seeds • Sexual

Reproduction by Pollination • Flower – organ that produces seeds • Fruit – develops around fertilized ovule(s) • Seed – fertilized ovule (embryo) and stored food (cotyledon) surrounded by a protective seed coat

Interactions Among Plant Systems Interactions during reproduction • Vegetative propagation – Shoot and root systems: part of an organ produces a new plant • Pollination – Shoot system: flowers are the site of seed pollination and fruit development – Shoot and root systems: produce hormones, transported by the vascular tissue, that regulate flower budding, fruit ripening and seed growth

Response • Tropisms – plant’s hormonal growth response toward or away from an external stimulus • Examples: – Phototropism – stem and leaves grow toward a light source – Positive gravitropism – roots grow toward gravity (downward) – Negative gravitropism – stem and leaves grow away from gravity (upward)

Interactions Among Plant Systems Interactions during response • Root system – Grows toward gravity • Shoot system – Grows toward light and/or away from gravity • Both systems – Produce hormones – Transported hormones

Interactions Among Plant Systems Learning objectives • Identify major systems in plants • Describe the interactions that occur among systems to carry out vital plant functions