“roots grow down and shoots grow up.” that is the conclusion drawn by a group of plant scientists. to validate their results a pea seedling was planted as illustrated. a porous pot of water is placed in the soil close to the pea seedling. how would you respond to the plant scientists’ initial conclusion?

a. they are incorrect. shoots are negatively geotrophic.

b. they are correct. roots are always negatively geotrophic

c. they are incorrect. roots are also positively hydrotrophic

d. they are incorrect. shoots are also positively hydrotrophic

a warm, wet climate will produce the highest rate of weathering. the warmer a climate is, the more types of vegetation it will have and the greater the rate of biological weathering (figure below). this happens because plants and bacteria grow and multiply faster in warmer temperatures.

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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answer: wheres the options

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