Biology Forums - Study Force

1) Individuals of the different pupfish species presumably would not mate with each other even if they were housed together. Which of the following is unlikely to be a possible reason for this?
A) evolved anatomical changes that render the species incompatible B) evolved behavioural changes that render the species incompatible C) evolved genetic incompatibilities between egg and sperm
D) evolved changes in the genetic code

2)If H. floresiensis could be shown to breed with H. erectus and the offspring were of normal size, one could conclude that
A) the genes for small stature are uniformly recessive.
B) the found H. floresiensis remains were from malnourished individuals whose failure to reach full size was a result of limited food resources in their habitat.
C) H. floresiensis did not suffer from hypothyroidism.
D) H. erectus remains were not from malnourished individuals.

3) Which of the following choices correctly states the sequence of tissues a tunnel would pass through (starting from the outer surface of the tree and passing through the central core)?
A) cork, cork cambium, secondary phloem, vascular cambium, sapwood, heartwood
B) epidermis, cortex, primary phloem, primary xylem, heartwood, sapwood
C) heartwood, wood rays, cork cambium, secondary xylem, secondary phloem, vascular cambium
D) bark, wood rays, growth rings, lateral meristems, primary phloem, secondary phloem

4) When the redwood tunnels were first constructed, not much consideration was given to the long-term effects of a tunnel on a tree’s health. Nevertheless, many trees have survived more than 100 years after the tunnel was cut through their trunks. This is possible because
A) the wood rays run laterally through the trunk, so water and nutrients can still travel to all the tree’s tissues.
B) the remaining heartwood is able to transport water and nutrients through the trunk.
C) the secondary xylem and phloem run vertically on either side of the vascular cambium and aren’t completely disrupted by the tunnel.
D) mature cork cells are dead, so their loss doesn’t disrupt nutrient and water transport.

5) The beetles, and a fungus with which they are often infected, together damage the xylem cells, which causes
A) an inhibition of photosynthesis. B) a disruption of the Calvin cycle. C) a blockage of water transport. D) an inhibition of respiration.

Hey Dr deno,

Could you give an update on what you ended up getting for these questions? Sorry no one was able to assist.