Q: Which equation best represents the efficiency of energy transfer between trophic levels in an ecosystem?

$$ E = \frac{P_{n}}{P_{n-1}} \times 100 $$

Question 1

Which of the following best describes the role of parasites in the Carpinteria salt marsh ecosystem, as illustrated by the food web diagram?

Accepted Answer

Parasites increase connectance and contribute to greater ecosystem stability.

Question 2

In the Carpinteria salt marsh, what is the effect of trematode infection on horn snail populations and algae abundance?

Accepted Answer

Trematode infection decreases snail population, resulting in more algae and more crabs.

Question 3

Which equation best represents the efficiency of energy transfer between trophic levels in an ecosystem?

Accepted Answer

$$ E = \frac{P_{n}}{P_{n-1}} 	imes 100 $$

Question 4

Environmental metabarcoding relies on which ribosomal RNA gene for broad identification of eukaryotic organisms?

Accepted Answer

18S rRNA

Question 5

In the context of parasite-driven biodiversity, what is the primary mechanism by which parasites promote host complexity, as shown in digital evolution simulations?

Accepted Answer

Parasites promote density-dependent transmission, leading to selection for more phenotypically evolvable genomes.

Question 6

Which of the following is a real-world example of a specialist parasite used in biocontrol to restore ecosystem balance?

Accepted Answer

Parasitoid wasps introduced to control cassava mealy bug populations in Africa

Question 7

What is the significance of the prevalence of trematode parasites in restored versus control sites in the Carpinteria salt marsh, as shown in the bar graph?

Accepted Answer

Trematode prevalence increased to levels similar to control sites, indicating successful restoration.

Question 8

Which of the following statements about parasites as indicators of ecosystem health is most accurate?

Accepted Answer

Generalist ectoparasites may be good measures for degraded ecosystems due to their adaptability and broad host range.

Question 9

In the context of interspecific competition, what is the effect of the nematode Heterakis gallinarum on partridge populations in the UK?

Accepted Answer

Pheasants transmit the nematode to partridges, leading to a decline in partridge populations.

Question 10

Which group of unicellular eukaryotes was found to be most abundant in tropical rainforest soil samples, according to environmental sequencing studies?

Accepted Answer

Apicomplexa

Question 11

What is the primary ecological function of cleaner fish in coral reef ecosystems?

Accepted Answer

Cleaner fish eat gnathiid isopods from other fish, reducing parasite load and improving fish health.

Question 12

Which of the following best explains why invasive species often cause major damage in new ecosystems?

Accepted Answer

Invasive species have a reduced set of predators and parasites, allowing unchecked population growth.

Question 13

Which of the following is a correct statement about hyperparasitism?

Accepted Answer

Hyperparasitism is the phenomenon where parasites themselves are parasitized by other organisms.

Question 14

Which molecular evidence supports the placement of myxozoans within the phylum Cnidaria?

Accepted Answer

Presence of polar capsules similar to nematocysts and molecular data from ribosomal RNA genes.

Question 15

Which of the following is a plausible consequence of climate change on parasite biodiversity, according to recent studies?

Accepted Answer

Parasite biodiversity faces extinction and redistribution, with some groups more vulnerable than others.

Question 16

Which of the following best describes the relationship between biodiversity and ecosystem productivity?

Accepted Answer

Higher biodiversity, often promoted by parasites, may increase ecosystem productivity.

Question 17

Which of the following is a correct step in environmental metabarcoding for species identification?

Accepted Answer

Amplify DNA markers using PCR after extracting DNA from environmental samples.

Question 18

Which of the following is a plausible reason why parasites are often dismissed in ecosystem studies despite their high biomass?

Accepted Answer

Parasites are usually small and not easily visible, leading to underestimation of their ecological impact.

Question 19

Which of the following best describes the effect of parasites on predator-prey relationships in ecosystems?

Accepted Answer

Predators preferentially kill prey infected by parasites, allowing for larger predator populations.

Parasite lec 12

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