Pine seedlings grown in sterile potting soil grow much slower than seedlings grown in soil from the area where the seeds were collected. This is most likely because _____
A) sterilized soil kills the root hairs as they emerge from the seedling
B) the normal symbiotic fungi are not present in the sterilized soil
C) sterilization removes essential nutrients from the soil
D) water and mineral uptake is slower when mycorrhizae are present
Answer: B
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Rapid turgor pressure changes in specialized multicellular swellings called ____________ are associated with leaves that move in response to touch or light.
A. petioles B. pulvini C. stipules D. pudicas E. coleoptiles
You are given a piece of connective tissue that you observe to be white, firm, and consists of a matrix of collagen. When chemically analyzed, it is found to contain high concentrations of minerals. What kind of connective tissue is this?
A. bone B. cartilage C. adipose D. dense connective E. blood
What structure regulates the flow of chyme out of the stomach?
What will be an ideal response?
Annelids ________.
a) have an exoskeleton and paired jointed appendages b) have a radical symmetry c) are segmented worms like earthworms and leeches d) are the simplest animals with organs and organ systems