Plant Physiology - General Questions and Answers

Complete this sentence correctly: Most energy comes from the sun and is converted to food energy the sun and is eventually converted to heat energy heat energy and is converted to chemical energy. chemicals and is converted to solar energy.

Answers must be in the essay form. Outline form is NOT acceptable. Labeled diagrams may be used to supplement discussion, but in no case will a diagram alone suffice. It is important that you read each question completely before you begin to write. 1. A laboratory assistant prepared solutions of 0.8 M, 0.6 M, 0.4 M, and 0.2 M sucrose, but forgot to label them. After realizing the error, the assistant randomly labeled the flasks containing these four unknown solutions as flask A, flask B, flask C, and flask D. Design an experiment, based on the principles of diffusion and osmosis, that the assistant could use to determine which of the flasks contains each of the four unknown solutions. Include in your answer (a) a description of how you would set up and perform the experiment; (b) the results you would expect from your experiment; and (c) an explanation of those results based on the principles involved. (Be sure to clearly state the principles addressed in your discussion.)

Personal safety equipment and practices in a BSL-1 or BSL-2 laboratory would generally include all of the following except a. refraining from eating and drinking in the laboratory. b. tying back long hair. c. wearing a mask over your nose and mouth. d. wearing shoes that cover the entire foot.

What statement best compares photosynthesis and cellular respiration? Photosynthesis breaks down sugars to release energy, while cellular respiration stores energy as sugars. Photosynthesis only takes place in the light, while cellular respiration takes place in the light and dark. Both photosynthesis and cellular respiration take place during the light and during the dark. Both photosynthesis and cellular respiration break down sugars to release chemical energy.

How do some plants survive the intense desert heat and drought? Plants close their stomata during times of Intense heat or drought in order to prevent water loss and maintain homeostasis. Plants only grow in shady areas during times of Intense heat or drought in order to prevent water loss and maintain homeostasis. Plants do not survive in the desert during times of Intense heat or drought. Plants do have the need to maintain homeostasis.

Characteristics of animal cells include which of the following? Select all that apply. no cell wall, only plasma membrane large hypertonic vacuole no chlorophyll or chloroplasts cell plate in cell division cleavage furrow

When the cell excretes sodium from within, against the natural tendency of matter, it is performing passive diffusion facilitated diffusion active transport pinocytosis

A plant may open and close its stomata to prevent excess water loss and maintain . adaptability homeostasis negative feedback a system level

Which is the best answer below to what would affect the enzymatic activity of an enzyme that uses a covalent catalysis mechanism where the substrate covalently bonds to serine? The enzyme will have strongly reduced activity if the pH changes from 7.0 to 7.4 due to decreased protonation of Serine The enzyme will have strongly increased activity if the pH changes from 7.0 to 7.4 due to increased protonation of serine Mutation of the active site serine to threonine would completely block catalysis due to the removal of the hydroxyl group None of the above

When an animal cell is placed in a hypotonic solution. It will gain water and may burst It will lose water and shrink It will remain the same size the cell's reaction cannot be determined

Explain how you would determine the pH of an unknown sample (using only the cabbage extract method) if the color formed after adding the cabbage extract was not identical to any of the colors of the pH standards.

One day, you go outside and see that the cars on the street are covered in a yellow "dust." Which of the following statements can be correctly applied to this "dust"? A) The dust is the seed production of pines and is so abundant because the seeds are tiny and take very little energy to produce. B) The dust is pine pollen and is so abundant because the pines are wind- pollinated. C) The dust is the spore production of ferns and is so abundant because the spores are wind-dispersed. D) The dust is the seed production of ferns and is so abundant because the seeds are tiny and take very little energy to produce.

Which of the following environmental factors probably helped early plants to successfully colonize land? A) an increased availability of symbiotic partners B) relatively few competitors for light C) a decreased availability of CO2 D) air's relative lack of support, compared to water's support