18. describe the relationship between photosynthesis and respiration. use the word equations for each reaction.

Both are opposite cellular metabolisms; one being anabolic while the other being catabolic breaking down the products synthesized in the other (photosynthesis).

Explanation:

Both photosynthesis and respiration are cellular metabolisms intertwined in the sense that photosynthesis assembles the products of respiration while respiration on the other hand breaks down the product of photosynthesis.

Photosynthesis is a metabolic (anabolic) process unique to the cells of organisms called autotrophs. Autotrophs including plant have the ability, using their Chlorophyll to trap the energy from sunlight and use it to power the combination of C02 and water (H2O) to produce glucose.

6C02 + 6H2O > C6H12O6 + 6O2

On the other hand, all living organisms including the photosynthetic organisms themselves require energy to power their life processes. They obtain this energy by breaking down organic food molecules (glucose) in the presence or absence of oxygen to produce CO2, water and ATP (energy currency of the cell). This process is called CELLULAR RESPIRATION.

C6H12O6 + 6O2 > 6CO2 + 6H2O

The relationship between these two processes is that photosynthesis utilizes CO2 and H2O as reactants to produce glucose (products), while respiration uses glucose as reactant to produce CO2 and H2O (products). Hence, products of one is the reactant of the other.

the corpus luteum secretes estrogens and progesterone. the latter hormone causes changes in the uterus that make it more suitable for implantation of the fertilized ovum and the nourishment of the embryo. if the egg is not fertilized, the corpus luteum becomes inactive after 10–14 days, and menstruation occurs.

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