1 / 47

Plants: Roots, Stems, Leaves, seeds and Flowers

Plants: Roots, Stems, Leaves, seeds and Flowers. Why are Plants so Important?. Produce oxygen Take out carbon dioxide from our world Can be used to make medicine Can be used as shelter Make food (so we have energy) Can make paper, desks, walls, etc. Parts of a Plant.

amelia
Download Presentation

Plants: Roots, Stems, Leaves, seeds and Flowers

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Plants:Roots, Stems, Leaves, seeds and Flowers

  2. Why are Plants so Important? • Produce oxygen • Take out carbon dioxide from our world • Can be used to make medicine • Can be used as shelter • Make food (so we have energy) • Can make paper, desks, walls, etc

  3. Parts of a Plant

  4. Label all parts of plant • Words to use: • - Root - Flower • - Stem - Fruit • Leaves - Seeds

  5. Roots – 2 types a) Taproot b) Fibrous Example: Carrots, Turnips Examples: Corn, Beans

  6. Functions of ROOTS • Anchors to hold plants in place • Absorb water and minerals • Transport water and minerals to stem • Sometimes used for food storage

  7. A Closer Look at Roots

  8. Cross Section of a Root

  9. How Can Plant Roots Get Damaged? • Adding chemicals to soil (pesticides, chemical waste, etc) • People cutting down trees – chopping off the roots • Putting salt on roads – salt ends up in the Earth/soil • Forest fires (destroy plants and their roots)

  10. What happens when a plant’s roots are damaged? • Plant will not grow and die

  11. What makes the roots grow downwards? • A hormone inside the plant detects gravity and causes root cells in the bottom tip to reproduce. • This is called ‘gravitropism’

  12. Let’s Look at Stems now 

  13. Functions of Stems • To hold leaves up to the sunlight • To transport materials between roots and leaves • Food Storage (Example: Irish potato tubers) • Protection (Example – thorns) • Can be used to create new plants • Can carry out photosynthesis (if stem is green – like cactus plant)

  14. Stems – 2 types a) Herbaceous b) Woody Example: Tulips Examples: Trees and shrubs

  15. Annual Rings • Each year an ‘annual ring’ forms • Scientists count up these annual rings and determine the age of the plant. • Scientists examine the thickness of these annual rings to determine the length of the growing season (i.e. how long summer was, etc)

  16. Cross Section of a Stem

  17. How Can Plant Stems Get Damaged? • People/animals cut down trees • Harsh weather (like snow, high winds, floods) can break off branches • Acid precipitation • Forest fires

  18. What happens when a plant’s Stems are damaged? • Transport of food/water to leaves does not happen – can lead to plant death • Plant not supported properly – so plant falls over • No photosynthesis in green stems

  19. What makes the Stems grow Upwards? • A hormone inside the plant makes the stems (shoots) grow upwards • This is also called ‘gravitropism”

  20. PLANT TISSUES • Dermal: the outermost cell layers, which protect the plant from cuts, invasion by microorganisms, and water loss. • On leaves and stems, these cells produce a waxy cuticle, like on an apple. They may also produce fine hairs (e.g. peach fuzz) or skin irritants.

  21. PLANT TISSUES • Meristematic: cells that divide by mitosis; area of growth • Ground tissue: internal, nonvascular tissues, e.g. the “fleshy” part of apples and pears, may perform functions such as photosynthesis and food storage.

  22. Tissues Cont: • Vascular Tissue: • Xylem: conducts water and minerals from the roots to the rest of the plant. • Phloem: food-conducting tissue; transports sugars and other plant products from one part of the plant to another.

  23. That’s it for Day 4 work. Now work on HW: p7 and 4.8 #1-5, 7

  24. Its all about the Leaves

  25. Main Functions • Primary site of photosynthesis • Must be able to: • Capture sunlight • Be able to carry out gas exchange • Prevent dehydration • Regulate water loss by opening and closingguard cells • Storage (for food and water) • Support (like for the tendrils on grape vines)

  26. If carrying out photosynthesis was the main function of leaves, then why aren’t all leaves very wide? If leaves were too wide, then leaves would dry out too quickly

  27. Basic Leaf Structure

  28. How Can Plant leaves Get Damaged? • Insects eating them • Pesticide use (burns leaf/prevent photosynthesis) • Acid rain can burn the epidermis • Forest fires and natural disasters

  29. What happens when a plant’s leaves are damaged? • No photosynthesis can occur • This means: - no oxygen, no food being made - animals that eat plants die

  30. PHOTOSYNTHESIS SUN + WATER + CO2 GLUCOSE + OXYGEN

  31. Fruit/Flowers 

  32. Main Function of Fruits/Flowers • To help plant produce a new plant (help hold and protect genetic information and later on get the seeds/pollen/spores out)

  33. Life Cycle of Flowering Plants • Male gametes = pollen grains, produced by the stamen (male part of flower, consisting of filament and anther)

  34. Life Cycle of Flowering Plants • Female gametes (eggs) are in the pistil (female part of flower), consisting of the sticky stigma, and the ovary) • Eggs are located in spaces called ovules in the ovary

  35. Life Cycle of Flowering Plants 1) Pollen carried by wind/animals to other flowers, grows down into the ovary 2) The zygote develops, and a seed is formed 3) The seed (with or without fruit) is released

  36. What’s with these Seeds …

  37. Seeds vs. Spores • Seeds – have genetic information and nutrition (fleshy part) • Spores – only genetic information (no food or nutrition, no fleshy parts)

  38. Main Function of Seeds/Spores • To hold genetic information and create new plant

  39. Parts of a Seed • Seed coat – protects embryo • Embryo - little plant - contains food to nourish plant • Seed leaves (cotyledons) - provide the necessary food energy until roots and true leaves form.

  40. Is a Bean plant a Monocot or Dicot?Is a Corn plant a Monocot or Dicot?

  41. How Can Plant Seeds/spores Get Damaged? • Humans touching them and destroying them • Acid rain • Chemicals being thrown onto plants • Too much heat/cold

  42. What happens when a plant’s Seeds/spores are damaged? • Plant will not grow

More Related