Photosynthesis & Respiration
Science, Grade 8
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glucose smaller molecules cytoplasm energy mitochondrion carbon dioxide Stage 2 smaller molecules water oxygen energy Photosynthesis Photosynthesis is a process by which green plants and certain bacteria use the energy from the Sun to convert carbon dioxide and water into the simple sugar glucose (C6H12O6) and oxygen. Plants and animals use glucose as a source of energy for all life processes. The process of photosynthesis begins in the leaves where light energy is absorbed by the green pigment chlorophyll. Chlorophyll is found within a plant cell organelle called the chloroplast. The captured light energy is then used to convert carbon dioxide and water into glucose and oxygen. stoma leaf vein stoma spongy cells epidermis guard cells nucleus chloroplast Using the captured light energy, glucose and oxygen are produced inside the chloroplasts through a complex series of chemical reactions. Carbon dioxide enters the leaf through tiny pores called stomata. (Oxygen produced leaves the leaf through the stomata also.) Chloroplasts capture light energy. Water enters the leaf. Cellular Respiration Cellular Respiration is a process by which cells break down glucose to release stored energy. Stage 1 of respiration begins in the cell’s cytoplasm through the break-down of glucose into smaller molecules releasing a small amount of energy. C6H12O6 + 6 O2 6 CO2 + 6 H2O + energy glucose oxygen water carbon dioxide 6 CO2 + 6 H2O C6H12O6 + 6 O2 oxygen glucose water light energy chlorophyll carbon dioxide 1 Sugar leaves the leaf. 5 2 3 4 water glucose carbon dioxide Stage 1 During Stage 2, the smaller molecules combine with oxygen in the mitochondria to produce a large amount of energy along with carbon dioxide and water. W ATER GL UC OSE Photosynthesis & Respiration © Copyright NewPath Learning. All Rights Reserved. 94-4701 www.newpathlearning.com
glucose smaller molecules cytoplasm energy mitochondrion carbon dioxide Stage 2 smaller molecules water oxygen energy Photosynthesis _________________________ is a process by which green plants and certain bacteria use the energy from the Sun to convert ____________________ and ____________________ into ____________________ and ____________________. Plants and animals use _________________________ as a source of _________________________ for all life processes. The process of photosynthesis begins in the leaves where light energy is absorbed by the green pigment ____________________ . Chlorophyll is found within a plant cell organelle called the ____________________ . The captured light energy is then used to convert carbon dioxide and water into ____________________ and ____________________ . stoma Using the captured light energy, glucose and oxygen are produced inside the chloroplasts through a complex series of chemical reactions. Carbon dioxide enters the leaf through tiny pores called stomata. (Oxygen produced leaves the leaf through the stomata also.) Chloroplasts capture light energy. Water enters the leaf. C6H12O6 + 6 O2 6 CO2 + 6 H2O + energy glucose oxygen water carbon dioxide 6 CO2 + 6 H2O C6H12O6 + 6 O2 oxygen glucose water light energy chlorophyll carbon dioxide 1 Sugar leaves the leaf. 5 2 3 4 water glucose carbon dioxide Stage 1 During ____________________ , the smaller molecules combine with ____________________ in the ____________________ to produce a large amount of energy along with ___________________ and ________________. W ATER GL UC OSE Key Vocabulary Terms • carbon dioxide • guard cell • cellular respiration • mitochondrion • chlorophyll • organelle • chloroplast • oxygen • energy • photosynthesis • glucose • stoma Cellular Respiration Cellular Respiration is a process by which cells break down glucose to release stored energy. The process of respiration begins in the cell’s ______________________ through the break-down of ______________________ into smaller molecules releasing a small amount of energy. Photosynthesis & Respiration © Copyright NewPath Learning. All Rights Reserved. 94-4701 www.newpathlearning.com \|xiBAHBDy01767nzW
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