11/18 - 7th Grade Agenda

Learning Objective: Learn about PlantsCollect HW: Unit Review & Reinforce p. 89 & 92 Short Video: Moss ReproductionVideo: Test your brainTextbook Reading 362 - 369HW: Reading & Notetaking p.171-174Reminder: Chap 4 Test on 11/19 & 11/20

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.

1. Obtaining water and other materials

2. Retaining Water

3. Transporting Materials

4. Support

5. 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

Moss Reproduction Video