Question

photosynthesis test

1. an inorganic molecule required by green plants for the process of photosynthesis is

a. oxygen
b. starch
c. carbon dioxide
d. glucose

1. which activity occurs in the process of photosynthesis?

a. chemical energy from organic molecules is converted into light energy.
b. organic molecules are obtained from the environment.
c. organic molecules are converted into inorganic food molecules.
d. light energy is converted into the chemical energy of organic molecules.

1. eating a sweet potato provides energy for human metabolic processes. the original source of this energy is the energy

a. in protein molecules stored within the potato
b. from starch molecules absorbed by the potato plant
c. made available by photosynthesis
d. in vitamins and minerals found in the soil

1. the diagram represents part of a life process in a leaf chloroplast

if the process illustrated in the diagram is interrupted by a chemical at point x, there would be an immediate effect on the release of
a. chlorophyll
b. nitrogen
c. carbon dioxide
d. oxygen

Explanation:

1. In photosynthesis, green plants use carbon dioxide (an inorganic molecule) along with water and light to produce organic molecules. Oxygen is a product, starch and glucose are organic products. So carbon dioxide is the required inorganic molecule.
2. Photosynthesis is the process where light energy is converted into the chemical energy of organic molecules (such as glucose). It is not the conversion of chemical energy in organic molecules to light energy, nor obtaining organic molecules from the environment or converting organic to inorganic.
3. The energy in a sweet - potato comes from the process of photosynthesis in the potato plant. Photosynthesis captures light energy and stores it as chemical energy in organic molecules like starch. It is not from protein molecules in the potato (which are not the original energy source), nor from starch absorbed by the plant (plants make their own starch through photosynthesis), nor from vitamins and minerals in the soil (which are not energy sources).
4. In the chloroplast, the process of photosynthesis releases oxygen. If the process is interrupted at a certain point, there will be an immediate effect on oxygen release. Chlorophyll is a pigment involved in the process, nitrogen is not directly related to the immediate release during photosynthesis, and carbon dioxide is a reactant not a product released immediately in the context of an interrupted process at a point in the chloroplast.

Answer:

1. C. carbon dioxide
2. D. Light energy is converted into the chemical energy of organic molecules.
3. C. made available by photosynthesis
4. D. oxygen