Campbell Biology: Concepts & Connections, Books a la Carte Edition (8th Edition)
8th Edition
ISBN: 9780321946683
Author: Jane B. Reece, Martha R. Taylor, Eric J. Simon, Jean L. Dickey, Kelly A. Hogan
Publisher: PEARSON
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Chapter 21, Problem 13TYK
It is estimated that 15% of Americans do not always have access to enough food. Worldwide, more than 1 billion people go to bed hungry most nights, and millions of people have starved to death in recent decades. In some cases, war, poor crop yields, and disease epidemics strip people of food. Many say instead that it is not inadequate food production but unequal food distribution that causes food shortages. What responsibility do nations have for feeding their citizens? For feeding the people of other countries? What do you think you can do to lessen world hunger?
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Energy cycles, nutrients flow one way
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Chapter 21 Solutions
Campbell Biology: Concepts & Connections, Books a la Carte Edition (8th Edition)
Ch. 21 - Label the parts of the human digestive system...Ch. 21 - Prob. 2CCCh. 21 - Earthworms, which are substrate feeders, a. feed...Ch. 21 - Prob. 4TYKCh. 21 - Which of the following vitamins is mismatched with...Ch. 21 - Which of the following statements is false? a. A...Ch. 21 - Why is it necessary for healthy vegetarians to...Ch. 21 - A peanut butter and jelly sandwich contains...Ch. 21 - Prob. 9TYKCh. 21 - How might our craving for fatty foods, which is...
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- What proportion of your diet would you estimate consists of meat, milk, eggs, or other animal products? Would you choose to decrease this proportion to reduce your ecological footprint? Describe other ways in which you could reduce your footprint through your food choices.arrow_forwardMost years, severe cold temperatures destroy a large number of grasshopper eggs. During one particular year, however, a mild winter allowed the grasshopper population to increase. This resulted in a well-fed frog and toad population as well as plenty of food for insectivorous snakes and birds. Unfortunately, the increased number of grasshoppers caused a higher percentage of crop damage due to insects. Which of the following best summarizes the food chain described in the paragraph above? crop --> grasshoppers --> snakes or birds crop --> grasshoppers --> snakes --> birds crop --> birds --> snakes crop --> grasshoppers --> toads --> birdsarrow_forwardOne farmer consumes one-half (0.5) chicken per day for a year One chicken consumes 40 grasshoppers per day 1,200 grasshoppers have a mass of one kilogram One grasshopper requires 25 grams of soybeans per year One human requires 750 grasshoppers per day Soybeans have 3.2 calories per gram 1a. Suppose the farmer chose to eat grasshoppers instead of chickens. How many people could the grasshoppers feed, compared to the one person that the chicken fed? 2a. The farmer needs to consume 3,500 calories per day. If he ate only soybeans instead of the chickens or grasshoppers, how many people would his soybean crop feed? 3a. Create a Biomass Pyramid using the data you have developed up to this point. At each trophic level, record the biomass of the organisms over a period of one year needed to support one farmer. Assume that a farmer weighs 75 kg and a chicken weighs 1.5 kg. The pyramid may be set up like this: 4a. Should people eat at a lower trophic level? Outline three pros and three cons of…arrow_forward
- What is food preservation and explain why we need to preserve our food.arrow_forwardWhat other observations were made in this documentary which you may have found of interest? Processed foods, education, school activity programs (like gym class), the effect of pollutants in the environment on the ability of people to metabolize food efficiently, food policy changes, food production) and perhaps something else you thought of while watching.arrow_forwardFrom a purely ecological standpoint, can the problem of world hunger ever be overcome by improved agriculture alone? What other components must a hunger-control policy include?arrow_forward
- Which of the following nutrients in food are most efficiently metabolized by microflora of ruminant animals? Select one: a. Lipids b. Proteins c. Carbohydrates d. Vitaminsarrow_forwardRising rates of heart disease and obesity led government scientists to advise Americans to reduce their _______ intake. This upset commercial _________ producers, and they pushed back through lobbyists and donations. The US government issued changed advice. 1. Wheat 2. Rice 3. Potato 4. Non-organic fruit 5. Meatarrow_forwardWhich of the following statements is not true? Group of answer choices People who have an alcohol or drug abuse problem tend to have sufficient amount of money to afford a nutritious meal. During desperate times, people resort to begging for food. People often do not have enough money to buy nutritious food as they spend on other necessities such as clothing, housing, and medicines. Some people might scavenge through garbage cans in hopes of finding food. In extreme cases of hunger, people resort to consuming pet foods.arrow_forward
- three living creature, X,Y,Z. They are given food m and n, where m is obtained from plants and n from meats. X eats m, Y eats n, Z eats both. How you are going to categories the living creatures based on their food source?arrow_forwardImagine a disease spreads among the desert grasshoppers and most of them die off. How would the grasshoppers’ disappearance affect the food chain and its organisms? Remember that the grasshopper eats some organisms and is also eaten by other organisms.arrow_forwardA single meal a day is enough to feed a cat. Is that premise a myth or a reality?arrow_forward
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