Along with clay, why are sand and silt needed in soil for proper plant growth?
1.Sand contains micronutrients that the plant needs for growth.
2.Sand and silt are negatively charged and thus bind nutrients in soil.
3.Sand and silt separate the clay particles to allow air in.
4.Sand and silt can expand when they absorb water, allowing moisture retention in soil.
3
You might also like to view...
Which of the following is an assumption used in the molecular clock approach?
A) Nucleotide changes accumulate in a sequence in proportion to time. B) Nucleotide changes are generally NOT transferred to progeny. C) Nucleotide changes are NOT random. D) Nucleotide changes are subject to intense selective pressure.
Food supplies that sustain animal populations have the capacity to increase:a
arithmetically. b. by accumulation and deduction. c. geometrically. d. symmetrically. e. migration rates.
Polar covalent bonds result from _______.
a) equal sharing of electrons in an ionic bond b) unequal sharing of electrons in an ionic bond c) hydrogen bonding between molecules d) equal sharing of electrons in a covalent bond e) unequal sharing of electrons in a covalent bond
Fatty acids are biosynthesized using ________ carbon molecules along with the help of ________
a. two / acyl carrier proteins b. two / lipid synthase c. four / acyl carrier proteins d. four / lipid synthase