Even if enough Fe is in the soil, deficiency can occur under the following conditions: poorly drained soil, high Ca, high Mn, high pH, high P, high heavy metals, oxygen deficiency. Deficiency symptoms General: Yellow or white areas on youngest leaves. Older leaves remain green.
Bt corn is a variant of maize that has been genetically altered to express one or more proteins from the bacteria Bacillus thuringiensis. The protein is poisonous to certain insect pests and is widely used in organic gardening. The European corn borer causes about a billion dollars in damage to corn crops each year.
Which of the following statements best describes how a corn plant comes to produce the Bt toxin? A. The Bt gene is inserted into each plant cell, one at a time, by using a bacterial plasmid. B. The bacteria containing the Bt gene are sprayed onto the corn plants. C. The Bt gene is inserted into one plant cell by using a bacterial plasmid. D. The Bt gene is inserted into the soil and is taken into the corn plant through the roots. Weegy: The Bt gene is inserted into the soil and is taken into the corn plant through the roots.