Plant Organ

SystemsHW: pg 88 #2-4, 18

Plant Systems

Plants generally have

two main organ systems:

the root system and

the shoot system.

A reproductive system is

also occasionally present

Plant Systems

Root System: an organ system in a plant, which

takes in water and minerals from the soil and

transports these substances to the shoot system.

Plant Systems

Shoot System:

an organ system in a plant,

which supports the plant,

performs photosynthesis,

and transports sap.

Plant Systems

Reproductive System:

In angiosperms, this organ

system is commonly

recognized as the flower

of a plant.

Plant Systems

The root and shoot systems

are a continuous system

connected by the

tube-like structures

formed by the

vascular bundles.

These bundles act similar to

a circulatory system.

Plant Systems

Xylem is composed dead cells that carry

water and minerals from the roots to other

parts of the plant

Phloem is composed of living tissue that

carries sugars produced by

photosynthesis to other parts of the plant.

Up the root systemWater is needed for photosynthesis.

1. To obtain water, a plant can absorb water from the soil through their roots.

2. The water will travel through the cortex of the root to reach the xylem of the vascular bundle.

3. Once in the xylem vessels, the water moves upwards to the rest of the plant.

This movement of water against gravity is accomplished through a push from the root system and a pull from the shoot system.

Up the root system

The push from the root system comes from root

pressure which is generated when the soil is very

moist.

Up the shoot system

To keep moving water up the xylem, a pull from the shoot system is necessary.

1. When the xylem brings the water to the leaves, the water is used in photosynthesis.

2. Water vapour can also be lost in the leaves through transpiration.

Transpiration is the evaporation of water through the stomata (pores) in leaves.

Up the shoot system

When water vapour concentration is high, guard

cells will swell with water and open the stomata.

When water vapour concentration is low, guard

cells will be relaxed and close the stomata.

Up the shoot system

The opening and closing of stomata also allows for

gas exchange between the leaf and the

atmosphere.

The Reproductive System

filament

anther

stigma

style

ovary

ovule

stamenpistil

The Reproductive System The reproductive system of angiosperm plants is

found in the flower.

The male reproductive organ is the stamen. It consists of an anther and a filament. The male gametes are found in the pollen on the anthe

The female reproductive organ is the pistil. It consists of the stigma, style, and ovary. The sticky stigma traps pollen which then allows the male gametes to travel down the style to the ovum in the ovary.

Seeds are produced from this process which can produce new offspring plants.