12/10 & 12/11- 7th Grade Agenda Learning Objective: Learn about Plants Collect HW: Unit Review & Reinforce p. 89 & 92 Video: Science in Action - Plant Structures Textbook Reading 362 - 369 HW: Reading & Notetaking p.172-173 Reminder: Chap 4 Test on 12/15 & 12/16 Reminder: Science Fair Proposal due 12/15 & 12/16

Reflection Prompt: Name 2 reasons why cells need to divide. What would happen if your cells stop dividing?

What is a plant? Autotrophs - Photosynthesis Cell Wall (Made of cellulose, a chemical that makes the walls rigid) Multicellular.

Origin of Plants – When did plants first appear? Oldest plant: 400 million years old Ancient Green Algae were ancestors of today’s plants.

5 things that plants must do to survive on land. Obtaining water and other materials Retaining Water Transporting Materials Support Reproduction

Living on Land – How do plants retain water? Cuticle: Waxy waterproof layer covers the leaves of most plant and helps to retain water.

Transport and Support – How can plants grow so tall? Vascular tissue: Internal tube like structures through which water and food move inside the plant

Classification of Plants Nonvascular Plant: Grows low to the ground Vascular Plant: Grows tall

Reproduction – Do plants produce eggs and sperms? In plants, Fertilization occurs when sperm cell unite with an egg cell The fertilized egg is called a zygote.

Complex Life Cycle Sporophyte Stage: Plant produce spores Gametophyte Stage: The plant produce two kinds of sex cells or gametes (sperm & egg cells)

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