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- Question 1 of 20
The yields of which of these crops are most likely to be reduced by ongoing declines in bee populations?CorrectIncorrect
- Question 2 of 20
Dichlorodiphenyltrichloroethane is related to the phenomenon of:CorrectIncorrect
- Question 3 of 20
Here is a data set on wing lengths in cm: 8, 9, 10, 10, 12, 13, 13, 14, 15, 15, 15, 19, 22, 25, 25. For this sample data set, the mean, median and mode are __________________, _________________, and _____________________ respectively.CorrectIncorrect
- Question 4 of 20
Dragonflies eat plant pollinators. Fish eat dragonfly larvae. A study compared the fitness of plants growing near ponds with and without fish. Given the above set of trophic interactions in a community, this study will likely find that:CorrectIncorrect
- Question 5 of 20
Assume that the abundance of a species in a community is proportional to the size of its niche. As each new species colonises this community, an existing niche is split. The resultant relative abundances of species in this community will be most uneven ifCorrectIncorrect
- Question 6 of 20
To study colour preference in bees, a student uses artificial flowers with a sugar reward. She gives bees a choice between blue round flowers and yellow square flowers of the same size. She finds that bees choose the blue flowers significantly more often than the yellow flowers and concludes that bees have a colour preference for blue flowers. However, her friend disagrees and suggests that she should have done the experiment differently. Which of the following would have been more appropriate to test for colour preference in bees?CorrectIncorrect
- Question 7 of 20
Which of the following does NOT form a component of phytohormone action?CorrectIncorrect
- Question 8 of 20
Fresh water fish belonging to the family Galaxoidae are found exclusively in the southern parts of the continents of South America, Africa and Australia. This pattern is explained by the theory proposed by:CorrectIncorrect
- Question 9 of 20
Ant species X preys upon ant species Y. A researcher has the following set of observations regarding the behaviour of species X where aggression signifies a predatory response.
Stimulus Reaction of Species
Glass bead coated with surface chemicals extracted from
Washed glass bead No reaction
Freshly immobilised Species Y individual Aggression
Freshly immobilised Species Y individual with surface
Which of the following statement(s) are correct regarding the behaviour of Species X?
(i) A glass bead is sufficient to elicit the predatory response.
(ii) Both chemical and non-chemical cues are involved in the predatory response.
(iii) Chemical cues are necessary to elicit the predatory response.
(iv) Chemical cues are sufficient to elicit the predatory responseCorrectIncorrect
- Question 10 of 20
Males in a population differ in the time they spend displaying to females. A researcher hypothesizes that predators are responsible for these differences. Males display for longer durations when there are no predators in the vicinity and for shorter durations when there is a predator nearby. Which of
the following study designs is the most appropriate test of this hypothesis?CorrectIncorrect
- Question 11 of 20
In Batesian mimicry, a harmless species mimics a harmful or toxic model species. Increasing the relative abundance of the mimic will:CorrectIncorrect
- Question 12 of 20
There are two alleles at a locus in a population in Hardy-Weinberg equilibrium. If the proportion of the dominant phenotype is 0.99, what proportion of the population is heterozygous? (Use decimal notation, not fractions or percentage)CorrectIncorrect
- Question 13 of 20
Haemophilia is a condition resulting from a sex-linked recessive gene in which individuals can suffer from excessive bleeding due to a blood-clotting disorder. In a human family with three children, the two sons are afflicted with haemophilia while the parents are normal. The probability that the daughter has inherited the gene for haemophilia is ______, and the probability that she is afflicted by haemophilia isCorrectIncorrect
- Question 14 of 20
Two islands, P and Q, are similar in habitat and other features. They are 100 and 200 km2 in size respectively, but have the same number of species. Which of the following statements can independently explain this observation?
(i) P is closer to the mainland than Q
(ii) P is further away from the mainland than Q
(iii) P has higher speciation rates than Q
(iv) P has lower speciation rates than QCorrectIncorrect
- Question 15 of 20
In reverse sexual selection, variance in mating success is higher in females than in males. In such species, which of the following is most expected?CorrectIncorrect
- Question 16 of 20
According to the Hamilton-Zuk hypothesis, females prefer males with the most elaborate ornaments because those ornaments signal parasite resistance. Which of the following is NOT an assumption of this hypothesis?CorrectIncorrect
- Question 17 of 20
A plant produces flowers that are open through the day and the night. An experimenter places pollen on the stigmas of freshly opened flowers and covers them after pollination to prevent natural pollinators from having access to the flowers. When experimental pollination was carried out during the day, 40% of the flowers yielded fruit. When experimental pollination was carried out during the night, 80% of the flowers yielded fruit. However, when flowers were kept open to natural pollination during the day (covered at night), 35% of flowers produced fruit. 20% of flowers exposed to natural pollination during the night (covered during the day) produced fruit. Which of the following statements is NOT a plausible explanation of these results ?CorrectIncorrect
- Question 18 of 20
Sex is determined by temperature in many reptiles, including crocodiles and turtles. While lower temperatures produce males in turtles, the pattern is the opposite in crocodiles. Due to climate change, there is an increase in temperatures which results in a change in sex ratios. In small populations, this change in demography is likely to negatively impact the population growth of:CorrectIncorrect
- Question 19 of 20
An unbiased coin is tossed four times. What is the probability of getting at least three “”heads”” in a row? (Use decimal notation, not fractions or percentage)CorrectIncorrect
- Question 20 of 20
Both males and females of a fish species show variation in colour. A population of this species consists of 40% blue females, 20% red females, 20% blue males and 20% red males. A researcher catches one fish at random from this population. Given that a male fish is caught, the probability that it is blue is _______. (Use decimal notation, not fractions or percentage)CorrectIncorrect