The mycorrhizae found interacting with the roots of land plants are
a. pathogens, feeding on plant tissue they have damaged with toxins.
b. parasites, draining sugar from the plant's vascular system.
c. saprophytes, stripping dead tissue from the root.
d. symbionts, facilitating the plant's uptake of minerals.
e. commensals, exploiting a benign environment, but neither helping nor harming the plant.
D; Mycorrhizae found with plant roots have a mutualistic symbiotic relationship, helping the plant to absorb minerals and receiving carbohydrates in return. While they may penetrate the root, they do not cause damage or disease (choices a and b), nor do they specifically remove dead tissue (choice c).
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Why can't "scientific creationism" be considered a science? Check all that apply.
_____ It is not supported by any empirical observations. _____ It does not obtain its principles from observation, as does science. _____ Its assumptions lead to no hypotheses that could be tested and possibly disproved. _____ The idea of creation by a supernatural agency lies outside the realm of science. _____ Only non-scientists believe it.
The blastula forms before this stage
a. A b. B c. C d. D e. E
The elements that make up the bulk of the Human body are
A) Carbon, Water and Nitrogen B) Carbon, Hydrogen, Oxygen and Nitrogen, C) Carbon, Helium, Oxygen, Nitrogen and D) Carbon, Oxygen, Nitrogen and Iron
Which of these can found in oak wood but not in pine wood?
A. tracheids B. vessel members C. ray cells D. secondary xylem E. secondary phloem