AGRN 1000 Exam 1
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| The best explanation for man’s sudden shift from hunting and gathering to an agriculture- based society is : | The shift from ice-ages to a warmer climate and development of religions
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| All stems are identified as such based on the presence of | Nodes
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| Light frequencies that are best absorbed by chlorophyll and other plant pigments are | Blues and reds
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| The main function of stolons is | Asexual propagation
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| The majority of carbon found on earth is in the form of |
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| The desired LAI (leaf area index) range for most crops is | 2.4 to 4.0
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| In its simplest form, photosynthesis can be divided into | Light and dark reactions
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| Compared to C3 plants, C4 plants are |
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| Photosynthesis takes place in specialized structures called chloroplasts, while respiration takes place in specialized structures called | Mitochondria
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| Subtracting the rate of glucose breakdown (respiration) from the rate of glucose accumulation (photosynthesis) gives the | Net assimilation rate
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| Water loss through the leaves is part of a plant process known as | Transpiration
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| A vegetatively-growing crop plant is subjected to a 13.5 hour photoperiod, which is increased by 1/2 hour each week. When the photoperiod reaches 15 hours, the plant starts to flower. This plant species would be | A long-day plant
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| Essential flower parts include the | Stamens and pistil
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| Of the following, the only plant parts that are involved in asexual reproduction are the | Stems
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| Based on the soil textural triangle (next page), a soil with 10% sand and 60% silt would be classified as a |
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| Based on the soil textural triangle (next page), a soil with 10% sand and 60% silt would be classified as a | Silty clay loam
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| In a given soil, the most variable of the four major components are | Water and air
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| Soil water-holding capacity (the ability of a soil to absorb and hold water) is mainly dependent upon | Soil texture and structure
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| Hygroscopic soil water is | Water that is unavailable to plants
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| Cation exchange capacity (CEC) is a measure of the ability of the soil to attract and hold cations, and as such |
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| The concentration of H+ ions in the soil |
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| The earth’s human population | Is currently over 6 billion (that’s billion with a “b”)
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| Crop plants thought to have originated in southwest Asia (present-day Iraq) include | wheat and other small grains
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| The most important crop families, in terms of food production, are | Poaceae, Fabaceae, and Solanaceae
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