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The best explanation for man’s sudden shift from hunting and gathering to an agriculture- based society is :
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All stems are identified as such based on the presence of
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AGRN 1000 Exam1 Prac
AGRN 1000 Exam 1
| Question | Answer |
|---|---|
| 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 |
| All stems are identified as such based on the presence of | Nodes |
| Light frequencies that are best absorbed by chlorophyll and other plant pigments are | Blues and reds |
| The main function of stolons is | Asexual propagation |
| The majority of carbon found on earth is in the form of | |
| The desired LAI (leaf area index) range for most crops is | 2.4 to 4.0 |
| In its simplest form, photosynthesis can be divided into | Light and dark reactions |
| Compared to C3 plants, C4 plants are | |
| Photosynthesis takes place in specialized structures called chloroplasts, while respiration takes place in specialized structures called | Mitochondria |
| Subtracting the rate of glucose breakdown (respiration) from the rate of glucose accumulation (photosynthesis) gives the | Net assimilation rate |
| Water loss through the leaves is part of a plant process known as | Transpiration |
| 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 |
| Essential flower parts include the | Stamens and pistil |
| Of the following, the only plant parts that are involved in asexual reproduction are the | Stems |
| Based on the soil textural triangle (next page), a soil with 10% sand and 60% silt would be classified as a | |
| Based on the soil textural triangle (next page), a soil with 10% sand and 60% silt would be classified as a | Silty clay loam |
| In a given soil, the most variable of the four major components are | Water and air |
| Soil water-holding capacity (the ability of a soil to absorb and hold water) is mainly dependent upon | Soil texture and structure |
| Hygroscopic soil water is | Water that is unavailable to plants |
| Cation exchange capacity (CEC) is a measure of the ability of the soil to attract and hold cations, and as such | |
| The concentration of H+ ions in the soil | |
| The earth’s human population | Is currently over 6 billion (that’s billion with a “b”) |
| Crop plants thought to have originated in southwest Asia (present-day Iraq) include | wheat and other small grains |
| The most important crop families, in terms of food production, are | Poaceae, Fabaceae, and Solanaceae |
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