Diseases of Agricultural Plants来源：www.examda.com
Plants, like animals, are subject to diseases of various kinds. It has been estimated that some 30,000 different diseases attack out economic plants: forty are known to attack corn, and about as many attack wheat. The results of unchecked plant disease are all too obvious in countries which have marginal food supplies. The problem will soon be more widespread as the population of the world increases at its frightening rate. Even in countries which are now amply fed by their agricultural products there could soon be critical food shortages. It is easy to imagine the consequences of some disastrous attack on one of the major crops; the resulting famines could kill millions of people, and the resulting hardship on other millions could cause political upheavals disastrous to the order of the world.
Some plants have relative immunity to a great many diseases, while others have a susceptibility to them. The tolerance of a particular plant changes as the growing conditions change. A blight may be but a local infection easily controlled, on the other hand it can attack particular plants in a whole region or nation. An example is the blight which killed virtually every. chestnut tree in North American. Another is the famous potato blight in Ireland in the last century. As a result of that, it was estimated that one million people died of starvation and related aliments.
Plant pathologists have made remarkable strides in identifying the pathogens of the various diseases. Bacteria may invade a plant through an infestation of insect parasites carrying the pathogen. A plant can also be inoculated by man. Other diseases might be caused by fungus which attacks the plant in the form of a mold or smut or rust. Frequently such a primary infection will weaken the plant so that a secondary infection may result from its lack of tolerance. The symptoms shown may cause an error in diagnosis, so that treatment may be directed toward bacteria which could be the result of a susceptibility caused by a primary virus infection.
1. How many diseases are known to attack wheat?
A) Around 30,000
B) Around 140
C) Around 29,960来源：www.examda.com
D) Around 40
2. According to this passage, which of the following would a plant disease result in if left unchecked?
A) A world war.
B) Border conflicts.来源：www.examda.com
C) Rations of grain and meat.
D) Social upheavals.
4. According to the passage, some plant diseases can be prevented by
A) killing parasites.
B) inoculation来源：www.examda.com
C) Killing insects
D) improving growing conditions
5. Which of the following statements is not true?
A) Some plant diseases may be caused by bacteria.
B) Some plant diseases may be caused by pathogens.
C) Some plant diseases may be caused by fungus.
D) Symptoms are always helpful in identifying diseases.
Keys: DDABD
