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Parts of the plant and their functions Importance of plants Without plants life on earth would not exist.

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Presentation on theme: "Parts of the plant and their functions Importance of plants Without plants life on earth would not exist."— Presentation transcript:


2 Parts of the plant and their functions

3 Importance of plants Without plants life on earth would not exist

4 Plants: Primary source of food for people and animals Produce oxygen help to keep us cool renew the air

5 slow wind speed provide a home for wildlife beautify surroundings perfume the air furnish building materials and fuel

6 Parts of a plant Four basic parts –l–leaves –s–stems –r–roots –f–flowers

7 Leaves the food factory of the plant produce the food used by the plant or stored for later use

8 Shape and size of leaves vary among plants used for identification of plants

9 Leaf arrangement alternate opposite whorled –a–arranged in a circle around the stem

10 External leaf structure petiole - leaf stalk leaf blade (leaf) –h–has veins –f–forms structural framework of the leaf

11 Midrib large center vein from which all other leaf veins extend

12 Margins edges of leaves assists in plant identification

13 Internal leaf structure epidermis –s–skin of the leaf –s–single layer of cells –p–protects leaf from loss of too much moisture

14 Guard Cells open and close the small pore on the underside of the leaf

15 Stomates allow the plant to breathe and transpire –g–give off moisture

16 Chloroplasts contain chlorophyll located inside the food making cells

17 Photosynthesis process by which CO2 and H2O in the presence of light are converted to sugar and oxygen

18 Chemical formula 6CO2 + 6H2O -----> in reaction with sunlight and chlorophyll > C6H12O6 (glucose) + 6O2

19 food manufactured in the leaves moves downward through the stem to the roots –u–used by the plant –s–stored in stem or root and leaf in the form of sugar, starch or protein.

20 Respiration plants respire 24 hours a day consume O2 and give off CO2 plants produce more O2 through ps. Than they consume during respiration and growth.

21 Stems have two main functions –m–movement of water and minerals from the roots upward and movement of manufactured food down

22 Stem functions support of leaves and reproductive structures

23 Stems also used for food storage and reproduction of plants involving cuttings Green stems manufacture food just as leaves do

24 External Stem Structure lenticels- breathing pores bud scale scars-indicate where terminal bud has been located previous year.

25 Leaf Scars shows where leaf was attached Distance between the two represents one year of growth.

26 Internal Stem Structure phloem- bark, carries manufactured foods down. Xylem- wood, carries water and minerals up. Cambium- separates the 2 and produces all new cells. Characteristic of dicots

27 dicot- dicotyledon, a plant with 2 seed leaves

28 Monocot Monocotyledon - a plant with one seed leaf. Have vascular bundles, contain both xylem and phloem in each small bundle

29 stems have no cambium cells enlarge to create size of mature stem

30 Economic Importance food building materials

31 Roots Usually underground functions: –a–anchor plant and hold upright –a–absorb water and minerals form soil and conduct to stem –s–store food, & propagation

32 Root Structure internal –s–similar to stems –o–older roots have xylem, phloem and cambian

33 external –r–root cap produces continuous supply of new cells protects roots as they push through soil

34 Structure root hairs –a–absorb moisture and minerals small roots

35 Functions other than water and mineral absorption cash crops for food –c–carrots –b–beets –r–radishes –s–sweet potatoes propagation

36 Type of root systems fibrous-grasses –e–easier transplanting –s–shorter, smaller, more compact lap root-carrot –l–longer and fewer roots

37 Flowers, Fruits, and Seeds pollination- color of flower attracts insects to fertilize flower –b–beginning of fruit and seed formation fruits and seed are attractive to birds who eat and spread seeds. –R–Reproduces plant –s–some seeds carried on animals coats

38 Parts of the Flower differ in size, shape, and color, some basic parts sepal –g–green leaf-like part, covers and protects bud before opening

39 Petals are actually leaves usually bright colors to attract pollinating insects.

40 Parts of the Flower stamens –m–male part of flower –h–has two parts filament-stalk

41 Anther anther- sac-like structure on top of filament, contains pollen

42 Parts of the Flower Pistil - female part in the center of flower has three parts

43 Pistil three parts stigma - top - sticky style - tube leading from stigma to ovary

44 Ovary egg cells develop here grows to become fruit or seedcoat

45 Types of Flowers complete –c–contains 4 main parts

46 Incomplete does not have all 4 main parts

47 Perfect has stamens and pistils

48 Imperfect lacks stamens or pistils

49 Types of Flowers monoecious –s–stamens and pistils are found in separate flowers on the same plant ex: Corn

50 dioecious male or staminate flowers found on one plant, female or pistilate flowers on another plant ex: holly

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