Transcript 4/20 & 4/21 - 7th Grade Agenda

3/24 & 3/25 - 7th Grade Agenda
Collect HW: Workbook p.173-176
Introduction to Plants
Video: Plant Structures
Textbook Reading 375 - 379
HW: Workbook p.181-182
Reminder: bring a large flower for a lab
on 3/31 & 4/1 (5 Points)
Last day to turn in late work is 3/26 &
3/27
Reminder Homework for 3/31 &
4/1
 HW: Bring a large flower
in a plastic bag w/ your
name on it. that we will
observe in class:
 You can go to a florist
and ask them of any old
flower that they are going
to throw away
 5 Points
Nature of Light
• Light is made up of
red, orange, yellow,
green, blue, and
violet light
• Sun is the source of
energy on Earth.
Why does the lemon looks
yellow and leaves look green?
• Because
lemon
reflects
yellow light
• Plant
leaves
reflect
green light.
Which color of light is absorbed
by chlorophyll?
• Chlorophyll absorb
blue and red light
Why do leaves turn red and
yellow in the autumn?
• Chlorophyll masks the
color of most accessory
pigments during most of
the year
• In cool temperatures,
chlorophyll breaks down
and the colors of
accessory pigments can
be seen.
Photosynthesis
• Carbon dioxide + water sugar + oxygen
• Excess food
made by plants
are stored in the
roots, stems or
leaves
What are the characteristics of
Nonvascular Plants?
• Mosses, Liverworts,
Hornworts
• Low growing
• Can pas materials
only from one cell to
the next
• Cell walls provide
support
• They get water
directly from their
surroundings.
Gametophyte & Sporophyte
What is a seed plant?
• All have vascular tissues
• Most plants are seed
plants (10 to 1)
• Seed plants use seeds to
reproduce
• All seed plants have
roots, leaves and stems
• In plants what you see
are the sporophyte stage.
Parts of Seeds
• Embryo
• Stored Food
• Seed Coat.
What do seeds need to develop
into a new plant?
• Light
• Water
• Nutrients.
How can seeds be scattered?
•
•
•
•
Animals
Water
Wind
Shooting out
of plant.
What is Germination?
• Early Growth Stage of
Embryo
What role do leaves play in
plant?
• Leaves capture the
sun’s energy and
carry out the food
making process of
photosynthesis
Structure of leaf
What are the functions of stems?
•
•
•
Carry substances
between the leaves
and roots
Support the plant
and hold up the
leaves
Store food.
What are the functions of roots?
• Anchor plants
in the ground
• Absorb water
and nutrients
from the soil
• Store food.