Question

no explaination is needed

14. If two species of seed-eating finch colonized an island on which there were seeds of only one size, what would Gause's principle of competitive exclusion predict? a) The finches would hybridize and become one species. b) One finch would evolve smaller beaks and the other would evolve larger beaks. c) One of the finch species would probably disappear from the island. d) The plants would evolve seeds of different sizes. 15. Which of the following is an example of Batesian mimicry? a) a clownfish living within an anemone b) a hawkmoth larva resembling a harmful snake c) the resemblance between cuckoo bees and yellow jackets d) the relationship between acacia trees and ants 16. In a positive feedback system where hormone A alters the amount of protein X a) an increase in A always produces an increase in X b) an increase in X always produces a decrease in A. c) a decrease in A always produces an increase in X. d) a decrease in X always causes a decrease in A 17. When the beta cells of the pancreas release insulin into the blood. a) the blood glucose levels rise to a set point and stimulate glucagon release. b) the skeletal muscles and the adipose cells take up glucose at a faster rate. c) the liver catabolizes glycogen. d) the alpha cells of the pancreas release glucose into the blood. 18. Oestradiol is an example of a) an androgen. b) an oestrogen. c) a progestin. d) a catecholamine. 19. The somatic nervous system can alter the activities of its targets, the skeletal muscle fibers, because a) it is electrically coupled by gap junctions to the muscles b) its signals bind to receptor proteins on the muscles. c) its signals reach the muscles via the blood d) it is connected to the internal neural network of the muscles 20. After the depolarization phase of an action potential, the resting potential is restored by a) the opening of sodium activation gates b) the opening of voltage-gated potassium channels and the closing of sodium channels. c) a decrease in the membrane's permeability to potassium and chloride ions d) a brief inhibition of the sodium-potassium pump

Answer 1

Q.14 - c : As per Gause's principle or the competitive exclusion principle, if two species are competing for the same limited resource, they cannot coexist at constant population levels. The species that has slight advantage over the other will dominate resulting in either extinction of gthe other species or an evolutionary shift towards a different ecological niche.