Tag: zoology

Questions Related to zoology

Greatest genetic diversity of crop plant 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:

Diversity in crops is showcased as genetic and phenotypic characters. These include variety of  the size of seeds, branching pattern, height differences, flower color, fruiting time and flavor. Genetic diversity is the total number of genetic characteristics that make up the species and play a major role in modern plant breeding and the greatest diversity in crop plants is seen in the homelands.

Species diversity in an ecosystem mainly depends on

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

  1. Light intensity

  2. Less temperature

  3. Rain fall

  4. Soil type

Show answer
Correct Option: C
Explanation:

Species diversity is a measure of the diversity within an ecological community that incorporates both species richness (the number of species in a community) and the evenness of species abundances and it varies from region to region and mainly depends on rainfall apart from other other factors like temperature, light intensity etc. 

Therefore, the correct answer is option C.

Which one of the following shows maximum genetic diversity in India?

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

  1. Groundnut

  2. Rice

  3. Maize

  4. Mango

Show answer
Correct Option: B
Explanation:

Rice has more than 50,000 genetically different strains, while mango has 1000 varieties in India. 

Therefore, the correct answer is option B.

Four species of birds have different egg colours: [1] white with no markings, [2] pale brown with no markings, [3] grey-brown with dark streaks and spots, [4] pale blue with dark blue-green spots. Based on egg colour, which species is most likely to nest in a deep tree hole?

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

  1. 1

  2. 2

  3. 3

  4. 4

Show answer
Correct Option: A
Explanation:

White birds with no markings would likely to nest in a deep tree hole as they can't camouflage with the surroundings and can easily be prey for its predators. Others can hide themselves under the color of trees. 

Therefore, the correct answer is option A.

How many species are believed to exist on Earth at present time?

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

  1. 5,000 to 10,000.

  2. Approximately 100,000.

  3. Approximately 500,000.

  4. Between 5 million and 30 million.

Show answer
Correct Option: D
Explanation:

The total variability of life forms on planet Earth is measured called as global biodiversity which is reported to be between 5 million and 30 million at present scenario.

So, the correct answer is option D.

Different local population of a species is known as 

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

  1. Deme

  2. Sister population

  3. Community

  4. None of the above

Show answer
Correct Option: B
Explanation:

Population is a unit of biotic community made of near group of multi breeding individuals of a species found in a geographical area at a particular time. It is called as deme.
Different populations of a species occupying different geographical areas are called as sister populations. 

Therefore, the correct answer is option B.

How does the genetic diversity of a modern corn field compare to the genetic diversity of a population of the pre-domesticated corn plant?

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

  1. Less diversity

  2. More diversity

  3. More genetic diversity, but less phenotypic variation

  4. The same amount of diversity

Show answer
Correct Option: B
Explanation:

The genetic diversity of a modern corn field is more diverse as it may contain genes transferred from from bacteria, to naturally protect it from pests 

For example, Bt corn
However, a pre domesticated corn plant is the one that is most suitable to be grown in a certain environment, majorly by artificial selection that is cross breeding and deriving a gene pool from an existing one that can provide a better commercial value
Example - sweet corn, a recessive trait, but is abundantly available due to taste preference and comparatively soft kernels

All of these are reasons why biodiversity is important except

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

  1. It allows for adjustment to disturbances .

  2. It cleans water.

  3. It provides food and materials.

  4. It has led to medical discoveries.

  5. It increases extinction rates.

Show answer
Correct Option: E
Explanation:
A. Biodiversity allows for adjustments to various disturbances. For example, trees control the rainfall.
B. As the polluted water flows through the dense areas having plants, it gets cleaned naturally.
C. Biodiversity provides food both for animals and mankind.
D. Biodiversity has to medical discoveries as various medicinal plants have been discovered.
E. Biodiversity reduces the extinction rates.
Hence statement E is incorrect.
So, the correct answer is 'It increases extinction rates'.

All of these are human activities that threaten biodiversity except  

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

  1. The release of excess nitrates from agricultural runoff

  2. Over-harvesting of plants and animals

  3. Overuse of herbicides

  4. Habitat preservation

  5. Excessive ultraviolet radiation from a depleted ozone layers

Show answer
Correct Option: D
Explanation:
A. Various fertilizers are used in agriculture which contain nitrogen as a key component. Runoff from agricultural land causes the release of excess nitrates.
B. Over harvesting of plants and animals for profit by the mankind has resulted into extinction of various species.
C. Overuse of herbicides kills the soil microflora and other microorganisms also.
D. Habitat preservation is not a threat to biodiversity as it will save the species.
E. Ozone has depleted due to various human activities like CFCs and due to this, excess ultraviolet rays can reach the earth and cause various problems to biodiversity.
Hence statement C is incorrect.
So, the correct answer is 'Habitat preservation'.

The greatest threat to genetic diversity in agricultural crops is

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

  1. Extensive use of insecticides and pesticides

  2. Extensive mixed cropping

  3. Introduction of high yielding varieties

  4. Extensive use of fertilisers

Show answer
Correct Option: C
Explanation:

Genetic diversity is the diversity in the number and types of genes present in different species and variations in the genes of the same species. The greatest threat to genetic diversity in agricultural crops is introduction of high yielding varieties. High yielding varieties contains the required traits and therefore are always bred purely. This reduces the genetic diversity within a particular species.

Thus, the correct answer is 'Introduction of high yielding varieties.'