DAY 22. Biogeochemical Cycles

Transcription

1 DAY 22 Biogeochemical Cycles

2 How does matter move in ecosystem?

3 Bio - Life Chemical - of or Geo - Earth relating to chemistry THE BIOGEOCHEMICAL CYCLES

4 ZOBEL FILM FESTIVAL! Today, you are going to enjoy watching a series of educational videos about the different Biogeochemical Cycles. Take down notes of the key important terms and concepts regarding the different cycles to be discussed and some of the moral lessons that you will learn. Use either your MLD or Science Notebook. In the end, you should be able to explain the carbon dioxide-oxygen, carbon, and nitrogen cycles. Hold on to your seat and let us start watching!

5 Watch the ff. videos: The Carbon Cycle, Carbon Dioxide Cycle Source: Nitrogen Cycle, Nitrogen Fixation Source:

6 Sharing (5 mins)! Who could briefly explain what happens in some of the cycles discussed in the films? What moral lessons have you learned? Okay, let us further wrap up our discussions about the different cycles.

7 THE GENERAL NUTRIENT CYCLE Source: Coronel et. al. (2006). Exploring and Protecting Our World 6. Quezon City: Vibal Publishing House, Inc. p. 107.

8 What do plants need to make food? Where do plants get water? carbon dioxide? sunlight? Water and carbon dioxide are examples of inorganic nutrients.

9 NUTRIENTS THAT PRODUCERS NEED Plants make food using nutrients from soil, water, and air. Examples of these nutrients are minerals such as phosphorus and nitrogen (in the form of nitrates, a nitrogen compound) that come from soil, and carbon dioxide which comes from air. These nutrients are called inorganic nutrients because they come from nonliving things.

10 Some of the foods produced by plants are carbohydrates which contain carbon, and proteins which contain nitrogen. Carbohydrates and proteins are examples of organic compounds. Organic compounds come from living things. Nutrients alternate between their inorganic form in the environment and their organic form in living things.

11 What do decomposers do to the remains of dead organisms?

12 Decomposers Eventually, people and animals die. Bacteria, fungi and worms feed on the remains of dead organisms. As they do so, they break down the organic compounds and release the nutrients back to the air and soil.

13 THE CARBON DIOXIDE-OXYGEN CYCLE

14 Through the process called photosynthesis, plants make food by absorbing carbon dioxide (CO 2 ) in air. Oxygen gas (O 2 ) is released in air as a by-product of photosynthesis. CHEMICAL REACTION: 6CO H 2 O Sunlight energy glucose + 6O 2 + 6H 2 O

15 Through the process called cellular respiration, animals (and also plants) use O 2 and produce energy and release CO 2 in air. CHEMICAL REACTION: glucose + 6O 2 + 6H 2 O 6 CO H 2 O + energy

16 THE CARBON CYCLE Source:

17

18 Carbon is part of the ocean, air, rocks, soil and all living things. Carbon doesn t stay in one place. It is always on the move! Can you explain again how each movement of carbon happens? Carbon moves from the air to plants. during photosynthesis Carbon moves from plants to animals. when the animals eat the plants Carbon moves from plants and animals to the ground. when plants and animals die and lay to the ground

19 Carbon moves from living things to the atmosphere. when the living things exhale/respire Carbon moves from fossil fuels to the atmosphere. when fossil fuels are burned Carbon moves from the atmosphere to the oceans. when the carbon soaks into the oceans

20 THE NITROGEN CYCLE

21 Source:

22 What are the four basic processes involved in the Nitrogen Cycle? 1. Nitrogen fixation nitrogen gas in the air is fixed by the lightning or nitrogen-fixing bacteria in plants into ammonia then organic nitrogen. 2. Mineralization - the organic nitrogen turns into ammonia then ammonium. 3. Nitrification when nitrifying bacteria or nitrifiers oxidize ammonium into nitrites then into nitrates. 4. Denitrification when denitrifying bacteria break down nitrates into nitrites then into nitrogen gas back into the atmosphere.

23 Note: You may read Cycles of Matter lesson page at your own free time to review about the Biogeochemical Cycles.

24 CINCH Lesson page Refer to CINCH Life Science 6-8 lesson page, Cycles of Matter

25 Highlight this Real-World Reading Link: On whom do you depend for your basic needs

26 LEARNING LOG How important is your role as a human being in the natural world? Post your answers in google classroom

27 ASSIGNMENT: Depending on your class number, research of a credible news (online) article in or about the Philippines that tackles on how certain events and activities disturb the interrelationship in an ecosystem/biosphere. CNs 1-5 CNs 6-10 climate change muro-ami fishing CNs overpopulation CNs illegal logging CNs kaingin system CNs quarrying CNs natural calamities Read, save that article and take note of the link to your reference.

28 References: Coronel et. al. (2006). Exploring and Protecting Our World 6. The Carbon Cycle Nitrogen Basics The Nitrogen Cycle ACKNOWLEDGEMENT Adapted from the modules prepared by Ms. Tolosa and Ms. Pe Benito