STF1053 Biodiversity Quiz- LU1

What is the definition of biodiversity?

• The variability among living organisms from all sources including terrestrial, marine, and other aquatic ecosystems

• The variety of animals, plants, fungi, and microorganisms that make up our natural world

• The changes caused to biodiversity by the interaction of living organisms' genetic complement with the physical environment over time

• The interaction of biodiversity with its physical environment

What are the three components of biodiversity?

• Genetic diversity, species diversity, and ecosystem diversity

• Variation of genes within species, variety of species within a region, and all the different habitats, biological communities, and ecological processes

• Variation of genes within species, variety of species within a region, and variation within individual ecosystems

• Genetic diversity, species diversity, and variation within individual ecosystems

What is ecosystem diversity?

• Ecosystem diversity refers to all the different kinds of living organisms found in a certain habitat.

• Ecosystem diversity is the variation in temperature and weather patterns in a given region.

• Ecosystem diversity is the assortment of different ecosystems in a specific geographic area.

• Ecosystem diversity encompasses the variety of habitats and biological communities within a particular area.

What is genetic diversity?

• The number of chromosomes in an organism.

• The process of selective breeding to create identical individuals.

• The variety of species in a specific ecosystem.

• The variety of genes and alleles within a population.

Answer explanation

A) The number of chromosomes in an organism is not the definition of genetic diversity. Genetic diversity is concerned with the variety of genes and alleles within a population, rather than the number of chromosomes in an individual.

B) Selective breeding aims to create identical or very similar individuals within a population, which reduces genetic diversity rather than promoting it.

C) While the variety of species in an ecosystem contributes to biodiversity, it is not the same as genetic diversity, which specifically focuses on the genetic variation within a population.

D) The correct answer is D. Genetic diversity refers to the variety of genes and alleles within a population. A higher level of genetic diversity in a population often leads to greater adaptability and resilience to environmental changes and challenges.

What are the main causes of loss of biodiversity?

• Natural disasters and competition with other species

• Overexploitation and exotic species introductions

• Destruction of habitat and pollution

• All of the above

What is one of the natural changes in biodiversity that can occur over geological time scales?

• Pollution from human activities

• Introduction of invasive species

• Evolution through speciation

• Mass extinction events

Answer explanation

As evolution through speciation is a natural process that leads to the development of new species over long periods of time. The other options are incorrect as they are typically associated with human-induced changes in biodiversity or catastrophic events, rather than natural processes.

What is the value of biodiversity?

• Consumptive use value, productive use value, and non-consumptive use value

• Food, clean water, medicine, and shelter

• Conservation of biodiversity as a common concern of humankind

• All of the above

What are the four main stages in the process of the origin of life?

• Conditions on early Earth, small organic molecules, protobionts, and the first genetic material

• Conditions on early Earth, organic compounds, protobionts, and the first genetic material

• Conditions on early Earth, small organic molecules, protobionts, and RNA world

• Conditions on early Earth, organic compounds, protobionts, and RNA world

The first genetic material was RNA.

• TRUE

• FALSE

Which of the following supports the RNA World hypothesis?

• DNA was the first genetic molecule.

• Proteins served as the first self-replicating molecules.

• Ribozymes can catalyze chemical reactions.

• The fossil record of ancient RNA-based life forms.

Answer explanation

The RNA World hypothesis posits that RNA (ribonucleic acid) was the first genetic material and played a crucial role in the early evolution of life. Ribozymes are RNA molecules capable of catalyzing chemical reactions, which provides experimental evidence supporting the idea that RNA could have acted as both a genetic material and a catalyst in primitive life forms.

A) DNA was the first genetic molecule: This is incorrect, as the RNA World hypothesis suggests that RNA preceded DNA in the evolution of life.

B) Proteins served as the first self-replicating molecules: This is incorrect, as the RNA World hypothesis suggests that RNA was likely the first self-replicating molecule.

D) The fossil record of ancient RNA-based life forms: This is incorrect because there is no direct fossil evidence of ancient RNA-based life forms, and the RNA World hypothesis is mainly supported by laboratory experiments and theoretical models.