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Plant Sciences

Plant Sciences. Biology-the branch of science that deals with both plant and animal organisms and life processes Zoology-the part of biology that deals with animals Botany the part of biology that deals with plants.

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Plant Sciences

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  1. Plant Sciences Biology-the branch of science that deals with both plant and animal organisms and life processes Zoology-the part of biology that deals with animals Botany the part of biology that deals with plants

  2. Applied plant sciences are based on the purposes for which the plants are grown • Agronomy • Forestry • Horticulture

  3. Agronomy • The science and practice of growing field crops such as cotton, wheat, tobacco, corn and soybeans.

  4. Forestry • The science and practice of growing, managing and harvesting trees for building materials and other products.

  5. Horticulture • The science and practice of growing, processing and marketing fruits, vegetables, and ornamental plants

  6. PHOTOSYNTHESIS • Autotrophic Process: Plants and plant-like organisms make their energy (glucose) from sunlight. • Stored as carbohydrate in their bodies. • 6CO2 + 6H2O + sunlight  C6H12O6 + 6O2

  7. Why is Photosynthesis important? • Makes organic molecules (glucose) out of inorganic materials (carbon dioxide and water). • It begins all food chains/webs. Thus all life is supported by this process. • It also makes oxygen gas!!

  8. Photosynthesis-starts to ecological food webs!

  9. Photo-synthesis means"putting together with light." • Plants use sunlight to turn water and carbon dioxide into glucose. Glucose is a kind of sugar. • Plants use glucose as food for energy and as a building block for growing. • Autotrophs make glucose and heterotrophs are consumers of it.

  10. How do we know that plants make carbohydrates from just carbon dioxide water and light energy? Experiments! • For example: Jan Baptisa van Helmont (1648) planted a willow branch weighing 5 pounds into 200 pounds of soil and then after 4 years the tree weighed 169 lbs. and the soil was still nearly 200 lbs.

  11. As can be seen from the equation for photosynthesis, the wood, bark, and root came from water and carbon dioxide. Photosynthesis Carbon dioxide + water glucose + oxygen sunlight absorbed by chlorophyll 6CO2 + 6H2O + energy  C6H12O6+ 6O2

  12. Leaves are green because they contain the pigment: Plants chlorophyll Leaves have a large surface area to absorb as much light as possible "Thanks for the Glucose!"

  13. PHOTOSYNTHESIS • Absorbing Light Energy to make chemical energy: glucose! • Pigments: Absorb different colors of white light (ROY G BIV) • Main pigment: Chlorophyll a • Accessory pigments: Chlorophyll b and Carotenoids • These pigments absorb all wavelengths (light) BUT green!

  14. PHOTOSYNTHESIS • Why do we see green? • Green color from white light reflected NOT absorbed • Chloroplast: organelle responsible for photosynthesis • Chlorophyll: located within Chloroplast • Green pigment

  15. Visible light is only a small part of the electromagnetic spectrum (all forms of light).

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