Which statement is correct about the mass of carbon dioxide used during photosynthesis? A) It is equal to the total mass of oxygen used. B) It is less than the total amount of glucose and water used. C) It is equal to the total mass of glucose and oxygen form. D)It is less than the total mass of glucose and oxygen form

D) It is less than the total mass of glucose and oxygen formed.

Explanation: During photosynthesis, six molecules of water reacts with six molecules of carbon dioxide to form one molecule of glucose and six molecules of oxygen. The balanced equation for the reaction is 6H2O + 6CO2 --> C6H12O6+ 6O2.

In writing chemical equations, the mass of the reactants must be equal to the mass of the products because according to the law of conservation of mass states that matter can neither be created nor be destroyed in an ordinary chemical reaction. The mass of carbon dioxide and water must be equal to the mass of glucose and oxygen formed. Therefore, the mass of carbon dioxide used during photosynthesis is less than the mass of glucose and oxygen formed.

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fertilization, pictured in figure 24.23a is the process in which gametes (an egg and sperm) fuse to form a zygote. the egg and sperm each contain one set of chromosomes. to ensure that the offspring has only one complete diploid set of chromosomes, only one sperm must fuse with one egg. in mammals, the egg is protected by a layer of extracellular matrix consisting mainly of glycoproteins called the zona pellucida. when a sperm binds to the zona pellucida, a series of biochemical events, called the acrosomal reactions, take place. in placental mammals, the acrosome contains digestive enzymes that initiate the degradation of the glycoprotein matrix protecting the egg and allowing the sperm plasma membrane to fuse with the egg plasma membrane, as illustrated in figure 24.23b. the fusion of these two membranes creates an opening through which the sperm nucleus is transferred into the ovum. the nuclear membranes of the egg and sperm break down and the two haploid genomes condense to form a diploid genome.

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