JSS1 Agricultural Science Objective Questions

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Classification of Crops based on Uses of Crops

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<h1><strong>CLASSIFICATION OF CROPS BASED ON USES OF CROPS</strong></h1> CONTENT Classification of Crops based on Uses of Crops <ol> <li>Food and Feed Crops</li> <li>Fibre Crops</li> <li>Oil Crops</li> <li>Latex Crops</li> <li>Beverage Crops</li> <li>Spice Crops</li> <li>Forage Crops</li> <li>Sugar Crops</li> <li>Drug Crops</li> <li>Stimulant Crops</li> <li>Ornamental Crops</li> </ol>   <h2><strong>Classification of Crop based on Uses of Crops</strong></h2> Agricultural crops can also be classified on the basis of their economic products or uses. In this classification a crop may belong to more than one group. <h2><strong>Food and Feed Crops: </strong></h2> These crops are produced mainly for consumption by man or livestock. Their various parts are eaten raw, cooked or processed. Food crops can be grouped into the following classes: (i) Cereal crops (ii) Legumes (iii) Vegetable crops (iv) Root and tuber crops (v) Fruit crops <h3><strong>Cereal Crops</strong>:</h3> These crops belong to the grass family called Gramineae. They are grown for their seeds or grains and are rich in carbohydrates (starch). Some grains are ground into powder. Bread is made from wheat and rye flour. Breakfast food, cakes and pastries and livestock feeds are also made from cereals. Examples are rice, millet, rye, maize, sorghum (guinea corn), wheat, barley, oats, acha. etc. The most important cereal crops are rice, wheat and corn. <img class="size-full wp-image-32083 aligncenter" src="https://classhall.com/wp-content/uploads/2018/11/classification-of-crops-based-on-uses-of-crops.jpg" alt="Classification of Crop based on Uses of Crops" width="498" height="156" />

Effects of Weed Control on Vegetation and Soil

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<h1><strong>EFFECTS OF WEED CONTROL METHODS ON VEGETATION AND SOIL</strong></h1> CONTENT <ol> <li>Effects of Chemical Control of Weeds on Vegetation and Soil</li> <li>Effects of Bush Burning on Vegetation and Soil</li> <li>Effects of Mechanical/Physical Control of Weeds on Vegetation and Soil</li> <li>Effects of Biological Control of Weeds on Vegetation and Soil</li> <li>Adverse Effects of Weeds/Problems Posed by Weeds in Agriculture/Economic Importance of Weeds</li> </ol>   <h2><strong>Effects of Chemical Control of Weeds on Vegetation and Soil </strong></h2> The following are the effects of chemical control of weeds on vegetation and soil: <ol> <li>Herbicides can be poisonous to human beings.</li> <li>Beneficial organisms may be destroyed.</li> <li>Herbicides can pollute soil and ground water.</li> <li>Herbicides can contaminate livestock pasture thereby killing the animals that feed on them.</li> <li>Some herbicides, when used, can kill both good and unwanted plants and animals.</li>

Classification of Crops based on Source of Food Nutrients

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<h1><strong>CLASSIFICATION OF CROPS BASED ON SOURCE OF FOOD NUTRIENTS</strong></h1> CONTENT <ol> <li>Classification based on Sources of Food Nutrients e.g. carbohydrates, protein, fat and oil, minerals, vitamins, etc</li> </ol> <h2><strong>Sources of Food Nutrients</strong></h2> Crops can also be grouped based on the class of nutrient derived from them. <strong>Table showing classification of crops based on nutrients, their sources and functions </strong>

Dispersal of Weeds (Weed Dissemination)

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<h1><strong>DISPERSAL OF WEEDS (WEED DISSEMINATION)</strong></h1> CONTENT <ol> <li>Introduction</li> <li>Meaning of Weed Dispersal</li> <li>Agents of Weed Dispersal</li> </ol> <h2><strong>Introduction</strong></h2> Weeds are widely dispersed through various adaptations. This is one of the reasons why weeds survive and are found in almost all cultivated fields. <h2><strong>Meaning of Weed Dispersal </strong></h2> This is the process by which seeds of weeds, fruits and propagules are carried from one place to another through one agent or the other. <h2><strong>Agents</strong> <strong>of Weed Dispersal</strong></h2> The agents of weed dispersal include the following:

Distribution of Crops in Nigeria

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<h1><strong>DISTRIBUTION OF CROPS IN NIGERIA </strong></h1> CONTENT <ol> <li>Meaning of Distribution of Crops in Nigeria</li> <li>Distribution of Crops of Nigeria</li> <li>Factors Affecting the Distribution of Crops</li> </ol>   <h2><strong>Meaning of Distribution of Crops in Nigeria</strong></h2> This refers to the region where each particular crop is mostly adapted in Nigeria. <h2><strong>Distribution of Crops of Nigeria</strong></h2> As you move from the south to the north of the country, the vegetation gradually changes from forest to savanna. There is, of course, no sharp distinction between one forest zone and the other. The vegetation types rather merged into one another. This is due to the gradual change in climatic conditions in the various regions/zones.

Meaning, Types and Classification of Pests

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<h1><strong>MEANING, TYPES AND CLASSIFICATION OF PESTS</strong></h1> CONTENT <ol> <li>Meaning of Pest</li> <li>Type of Pests</li> <li>Classification of Pests based on Mouth Parts</li> <li>Classification of Insect Pests based on the Location</li> </ol> <strong> </strong> <h2><strong>Meaning of Pest</strong></h2> Pest can be defined simply as any living organism, plant or animal, which can cause damage to cultivated crops, animals and human beings. Human beings can also be called pests if they cause damage to crops or livestock. Pests can carry organisms that cause diseases and constitute nuisance to agricultural products. Majority of crop pests are invertebrates e.g. insects and eel-worms.

Uses of Crops

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<h1><strong>USES OF CROPS </strong></h1> CONTENT <ol> <li>Uses of Crops</li> <li>Uses of Crop by-products</li> </ol>   <h2><strong>Uses of Crops</strong></h2> There are many uses of crops. These include: <ol> <li>Provision of food for humans</li> <li>It provides shelter (houses) for people to live.</li> <li>Clothing materials are made from crop materials e.g. cotton.</li> <li>Crops planted can be used to control erosion.</li> <li>Some crops are used as ornamentals such as flower to decorate and beautify our surroundings.</li>

Description of the Damage Done by Pests

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<h1><strong>DESCRIPTION OF THE DAMAGE DONE BY PESTS</strong></h1> CONTENT <ol> <li>Description of the Damage Done by Pests</li> <li>Table Showing the Description of Damage Done by Crop Pests</li> </ol>   <h2><strong>Description of the Damage Done by Pests</strong></h2> Crop pests do a lot of damage to crops either on the farm or in the store. The damages done by pests include: (i) Some insect pests are carriers of diseases which they transmit to healthy plants. Examples of diseases transmitted by insect are: ground nut rosette, cassava mosaic, swollen shoot of cocoa, etc. (ii) Mammals (rodents) e.g. rats, grass-cutter eat up the tubers of yam, cassava and potato.

Effects of Crop Pests on Yield; Economic Importance of Pests

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<h1><strong>EFFECTS OF CROP PESTS ON YIELD</strong></h1> CONTENT <ol> <li>Effects of Crop Pests on Yield</li> <li>Economic Importance of Pests</li> </ol>   <h2><strong>Effects of Crop Pests on Yield</strong></h2> Crop pests have the following effects on crop yield: <ol> <li>Heavy attack by pests may result in total crop failure.</li> <li>Infected seeds, crops, and vegetables have low market value.</li> <li>Pests reduce the quality of crops.</li> <li>Pests eat up leaves of crops, thereby reducing the photosynthetic activity of the plant.</li> <li>They cause injury which may predisposes crop to diseases attack.</li>

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