CSES Exam 1 Questions and Answers
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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 climate
more favorable to agriculture
The earth's human population - ✔✔is currently over 7 billion
Crop plants thought to have originated in Africa include - ✔✔watermelon,
okra, sorghum
The most important crop families, in terms of food production, are -
✔✔Poaceae, Fabaceae, and Solanaceae
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 leaves is - ✔✔Light (energy) gathering and food
(sugar) production
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Of the carbon found on earth, the largest amount is in the form of -
✔✔Fossil fuels and mineral carbonates (limestone)
The desired LAI (leaf area index) range for most crops is - ✔✔2.6 to 4.0
In its most basic form, photosynthesis can be divided into - ✔✔light and
dark reactions
Compared to C3 plants, C4 plants are - ✔✔more likely to be tropical or
tropical in origin
Photosynthesis converts light energy into chemical energy (sugars) while
respiration - ✔✔is defined as the loss of water through leaf stomata
Subtracting the rate of glucose breakdown (respiration) from the rate of
glucose accumulation (photosynthesis) gives the - ✔✔Net 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
(10.5 hours of darkness), 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 - ✔✔pistil and stamen