Plant report
Biology 9 CP Per 3
November 7, 2011
Plants and Nitrogen Lab Report Introduction: Plants need ammonia, a combination of nitrogen and hydrogen, or nitrate, a form of inorganic nitrogen to grow. Most nitrogen is found in the atmosphere. However, plants and animals cannot directly absorb the nitrogen found in the atmosphere. Instead nitrogen gas is captured from the air by species of bacteria that lie in the water, soil, or grow on the roots of some plants. These bacteria convert the nitrogen into a form usable by plants. The process of bacteria converting nitrogen into a form usable by plants is called nitrogen fixation. Rhizobium is a species of bacteria that performs nitrogen fixation. Its presence can be proven by the appearance of nodules or bumps on the root of the plant. It helps the plant by giving it usable nitrogen and in return the bacteria gets energy from the plant itself. This relationship of two organisms benefiting from each other is called mutualism. Then heterotrophs, organisms that consume other organisms for energy, eat the plants and take in their nitrogen. When animals urinate they also pass nitrogen back into the soil or water to be re -used. Which substance, rhizobium, nitrogen (in the form of urea, which is a chemical compound found in urine) , or water would make certain plants grow faster? What
could this mean in terms of growing other urgently essential things like food? In this lab we used the plants grass and clover. We then used the three liquids with each of the types of plants.
Materials and Methods: In this lab many materials were used. Among them are perlite, greensand, rhizobium, urea, water, clover seeds, grass seeds, a marker, a ruler, a beaker, a test tube rack, plastic wrap, a teaspoon and a pencil. The first thing we did was to measure the half point of all the test tubes with a ruler and mark them with a marker. Then we labeled each test tube with the initials of the names of the people in
November 7, 2011
Plants and Nitrogen Lab Report Introduction: Plants need ammonia, a combination of nitrogen and hydrogen, or nitrate, a form of inorganic nitrogen to grow. Most nitrogen is found in the atmosphere. However, plants and animals cannot directly absorb the nitrogen found in the atmosphere. Instead nitrogen gas is captured from the air by species of bacteria that lie in the water, soil, or grow on the roots of some plants. These bacteria convert the nitrogen into a form usable by plants. The process of bacteria converting nitrogen into a form usable by plants is called nitrogen fixation. Rhizobium is a species of bacteria that performs nitrogen fixation. Its presence can be proven by the appearance of nodules or bumps on the root of the plant. It helps the plant by giving it usable nitrogen and in return the bacteria gets energy from the plant itself. This relationship of two organisms benefiting from each other is called mutualism. Then heterotrophs, organisms that consume other organisms for energy, eat the plants and take in their nitrogen. When animals urinate they also pass nitrogen back into the soil or water to be re -used. Which substance, rhizobium, nitrogen (in the form of urea, which is a chemical compound found in urine) , or water would make certain plants grow faster? What
could this mean in terms of growing other urgently essential things like food? In this lab we used the plants grass and clover. We then used the three liquids with each of the types of plants.
Materials and Methods: In this lab many materials were used. Among them are perlite, greensand, rhizobium, urea, water, clover seeds, grass seeds, a marker, a ruler, a beaker, a test tube rack, plastic wrap, a teaspoon and a pencil. The first thing we did was to measure the half point of all the test tubes with a ruler and mark them with a marker. Then we labeled each test tube with the initials of the names of the people in
Bibliography: Mark, Herman F. "Fishing." The Book of Knowledge. 10th ed. Chicago: Grolier. 1992