Tag: biodiversity, classification and conservation

Questions Related to biodiversity, classification and conservation

Greatest genetic diversity of plants is found in

zoology biodiversity, classification and conservation levels of biodiversity environmental conservation and biodiversity biodiversity on earth and in india

  1. Central America

  2. Homelands

  3. South America

  4. India

Show answer
Correct Option: B
Explanation:

Sexual reproduction is critical for maintaining genetic diversity within a species because it combines the parents genetic material, resulting in offspring with unique genetic blueprints different from either parent. Genetic diversity is important for two reasons. First of all, when a population of an organism contains a large gene poolthat is, if the genetic blueprints of individuals in the population vary significantly the group has a greater chance of surviving and flourishing than a population with limited genetic variability. Second, genetic diversity also reduces the incidence of unfavorable inherited traits. The home lands of our food crops are vital geographic regions where the greatest genetic diversity for each species can be found. Because in homelands there are more chances of sexual reproduction with in the species which is critical for maintaining genetic diversity. Thus, option B is correct. Greatest genetic diversity of plants is not found in Central America, India and South America. Thus, other options are wrong.

Study statements (a - d) and select the two correct statements. 
(a) A lion eating a deer and a sparrow feeding on grain are consumers.

(b) Predator starfish and Pisaster help in maintaining species diversity of some invertebrates.
(c) Predators ultimately lead to the extinction of prey species.
(d) Plant chemicals like nicotine and strychnine are produced due to metabolic disorders. 

zoology biodiversity, classification and conservation levels of biodiversity environmental conservation and biodiversity biodiversity on earth and in india

  1. c and d

  2. a and d

  3. a and b

  4. b and c

Show answer
Correct Option: C

The species diversity of plants on Earth will be

zoology biodiversity, classification and conservation levels of biodiversity environmental conservation and biodiversity biodiversity on earth and in india

  1. 2.4%

  2. 22%

  3. 8.1%

  4. 85%

  5. 70%

Show answer
Correct Option: B
Explanation:

Species diversity is the number of different species, that are represented in a given community. 

Species diversity consists of two components: species richness and species evenness. Species richness is a simple count of species, whereas species evenness quantifies how equal the abundances of the species are. More than 70% of species recorded are animals and 22% are plant species.

Discovery of new species has recently picked up due to project _________.

zoology biodiversity, classification and conservation levels of biodiversity environmental conservation and biodiversity biodiversity on earth and in india

  1. Species 2000

  2. Global Biodiversity Information Facility

  3. Agenda 21

  4. Both A and B

Show answer
Correct Option: D
Explanation:

A) Species 2000 is an autonomous federation of taxonomic database custodians which involves taxonomists in the whole world. 

B) The Global Biodiversity Information Facility is an international organization which basically focusses on making scientific data on biodiversity available on the internet.
C) Agenda 21 is an action idea of the United Nations which addresses sustainable development. 
Discovery of new species has recently picked up due to project Species and 2000 and Global Diversity Information Facility.
So, the correct answer is 'Both A and B'.

A continental population of insects has blue, red, green, and black variations. The color is controlled by the interaction of two genes, one with two alleles, the other with three alleles.
A piece of driftwood carrying two green insects and five red insects floats in the ocean for several days and washes up on a small island where the insect species did not previously live. The seven insects establish a new population on the island that increases in number significantly over several generations.
Which of the following statements correctly compares the island population with the original mainland population?

zoology biodiversity, classification and conservation levels of biodiversity environmental conservation and biodiversity biodiversity on earth and in india

  1. Red is dominantly inherited in the island population, while on the mainland green is dominant.

  2. The island population has lower genetic diversity than the mainland population.

  3. The island population is more likely to experience competition with other insect species than the mainland population.

  4. The island population size is increasing, while the mainland population is decreasing.

Show answer
Correct Option: B
Explanation:

It is given that out of blue, red, green and black variations of insects, only red and green insects established a new population on the new island. Since, these four colors are controlled by two genes, new population could have either of colour of insects. It is an example of founder effect. The island population will have lower genetic diversity than the mainland population because small populations usually have less genetic diversity than large population.

Thus, the correct answer is 'The island population has lower genetic diversity than the mainland population.'

The impact of loss of biodiversity include

zoology biodiversity, classification and conservation biodiversity losses biodiversity loss and need for conservation environmental conservation and biodiversity

  1. decline in plant production

  2. lowered resistance to environmental perturbations

  3. increased variability in ecosystem processes like plant productivity, water use, pest and disease cycles

  4. all of these.

Show answer
Correct Option: D
Explanation:

Loss of biodiversity includes decline in plant production, lowered resistance to environmental perturbations and increased variability in processes of ecosystem.

So, the correct option is 'all of these.'.

Which of these actions does not cause decrease in biodiversity?

zoology biodiversity, classification and conservation biodiversity losses biodiversity loss and need for conservation environmental conservation and biodiversity

  1. Pollution

  2. Forest fire

  3. Overgrazing

  4. Afforestation

Show answer
Correct Option: D
Explanation:

Decrease or loss of biodiversity can be brought by pollution in environment and habitat, forest fires and loss of habitat and overgrazing. While afforestation or planting of forest trees cause conservation of natural habitat thus saving the biodiversity.

So, the correct answer is 'Afforestation'.

What factors lead to decline in biodiversity? 

zoology biodiversity, classification and conservation biodiversity losses biodiversity loss and need for conservation environmental conservation and biodiversity

  1. Acid rain

  2. Pollution

  3. Population

  4. All of the above

Show answer
Correct Option: D
Explanation:

The major causes of biodiversity decline are land use changes, pollution, changes in atmospheric CO$ _2$ concentrations, changes in the nitrogen cycle and acid rain, climate alterations and the introduction of exotic species, all coincident to human population growth. The geometric rise in human population levels during the twentieth century is the fundamental cause of the loss of biodiversity. It exacerbates every other factor having an impact on rainforests. It has led to an unceasing search for more arable land for food production and livestock grazing, and for wood for fuel, construction, and energy. 

Which of the following is/are factors that pose a great threat to biodiversity?

zoology biodiversity, classification and conservation biodiversity losses biodiversity loss and need for conservation environmental conservation and biodiversity

  1. Habitat destruction

  2. Disturbance and introduction of alien species

  3. Man's interference with nature

  4. All of the above

Show answer
Correct Option: D
Explanation:

Biodiversity refers to the variety of organisms in an ecosystem. However, the biodiversity of an ecosystem is lost when there is fragmentation of the habitat or invasion by any alien species. The interference of the man with the nature and exploitation of its resources can result in the loss of the biodiversity. 

Thus, the correct answer is option D. 

Which of the following type of animal is chiefly protected by man?

zoology biodiversity, classification and conservation biodiversity losses biodiversity loss and need for conservation environmental conservation and biodiversity

  1. Harmless animals

  2. Economically useful animals

  3. Extinct animals

  4. Feeble animals

Show answer
Correct Option: C
Explanation:

Man makes special efforts to conserve the animals, which are likely to become extinct without special efforts of man to conserve biodiversity and animals are a part of biodiversity. 

Thus, the correct answer is option C