Photosynthetic photography of green plants

( 1) 1→3→2→7→4→6→5;

(2) The original starch in the leaves was transported away and used up;

(3) forming a control experiment;

(4) iodine solution; Starch;

(5) lighting;

(6) carbon dioxide+water (chloroplast)->; Organic matter (energy storage)+oxygen;

(7) carbon dioxide and water;

(8) white; Green;

(9) blue;

( 10)C；

(1 1) organic matter;

(12) Food source; Source of oxygen; Energy.

Problem solving process:

(1) The method includes the following steps: 1 dark treatment →3 partial shading and illumination →2 picking leaves to remove black paper →7 alcohol decoloration →4 rinsing →6 drops of iodine solution inspection →5 washing iodine solution to observe the leaf color, that is, 1 → 3 → 2 → 7 → 4 → 6 → 5.

(2) dark treatment: put potted geranium in the dark place day and night, so that the original starch in the leaves is exhausted, and the interference of the original starch on the experiment is eliminated, so as to ensure that the experiment is carried out indoors. ..

(3) The light after shading is divided into three parts: some leaves on both sides are covered with black paper to form a control experiment, and the experimental variable is light. During the experiment, leaves produce starch, which also shows that leaves can produce starch only under light conditions.

(4)6 drops of iodine solution test: add iodine solution to the leaves to detect whether starch is produced according to the characteristics that starch turns blue after contacting iodine.

(5) This experiment verified that green leaves produce organic matter under light-the variable of starch is light, the light part is used as the control group, and the shadow part is used as the experimental group, indicating that green leaves only produce starch under light.

(6) Photosynthesis is essentially a process in which green plants use light energy to convert carbon dioxide and water into energy-storing organic substances and release oxygen through chloroplasts.

(7) The raw materials of photosynthesis are carbon dioxide and water; The conditions are: light energy; Location: chloroplast; Products are: organic matter-starch and oxygen.

(8) Pelargonium leaves are white and the rest are green. Figure 2 shows that after a day and a night in the dark, the leaves of black geranium are covered with black paper. Part A of leaves is white, parts B and C contain chloroplasts, and chloroplasts are green because they contain chlorophyll.

(9) As shown in Figure 2, two groups of control experiments can be formed: one group is B and C, and the variables are light; The other group is A and C, and the variable is chloroplast. Chloroplast is the place of photosynthesis, part B is covered, and it is not blue when exposed to iodine, which shows that light is the condition of photosynthesis.

(10) In Figure 2, the control group with chloroplasts as variables is part A and part C of leaves, part A is not blue in iodine solution, and part C is blue in iodine solution, which indicates that chloroplasts carry out photosynthesis.

(1 1) Photosynthesis refers to the process that green plants use the energy provided by light to synthesize starch and other organic compounds in chloroplasts, and convert light energy into chemical energy and store it in organic substances.

(12) Organic matter produced by green plants through photosynthesis not only meets the needs of their own growth, development and reproduction, but also provides basic food, oxygen and energy for other creatures in the biosphere. It maintains the balance between carbon and oxygen in the biosphere.

Extended data:

In a narrow sense, organic compounds are mainly composed of carbon and hydrogen, and contain carbon to a certain extent, but do not include carbon oxides, sulfides, carbonic acid, carbonates, cyanides, thiocyanates, carbides, carboranes, alkyl metals, carbonyl metals, organometallic ligand complexes and other substances.

Organic matter is the material basis of life, and all living things contain organic matter. Fat, amino acids, protein, sugar, heme, chlorophyll, enzymes, hormones, etc.

Both metabolism and genetic phenomena in organisms involve the transformation of organic compounds. In addition, many substances closely related to human life, such as oil, natural gas, cotton, dyes, chemical fibers, plastics, plexiglass, natural and synthetic drugs, are closely related to organic compounds.