Tag: biodiversity on earth and in india

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

Which of the following ways is most likely to decrease the genetic diversity in a population?

  1. Gene mutation

  2. Genetic recombination

  3. Stabilising natural selection

  4. Immigration of individuals
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
  • Genetic diversity is the total number of genetic characteristics in the genetic makeup of a species. For example, The genetic diversity shown by the medicinal plant Rauwolfia vomitoria growing in different Himalayan ranges might be in terms of the potency and concentration of the active chemical (reserpine) that the plant produces. 
  • Genetic variation is an important force in evolution as it allows natural selection to increase or decrease the frequency of alleles already in the population.
  • Stabilizing natural selection is most likely to decrease the genetic diversity in a population because the frequency of alleles remains constant in stabilized natural selection.
  • So, the correct answer is 'Stabilising natural selection'.
Multiple choice zoology biodiversity, classification and conservation levels of biodiversity environmental conservation and biodiversity biodiversity on earth and in india

Which of the following is incorrectly matched?

  1. Alpha diversity Number of species in a given habitat

  2. Genetic diversity Variation of genes within species

  3. Beta-diversity - Diversity of habitat in the whole region

  4. Species diversity - The product of species richness and evenness
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Genetic diversity is the total number of genetic characteristics in the genetic makeup of a species. It is distinguished from genetic variability, which describes the tendency of genetic characteristics to vary. Genetic diversity serves as a way for populations to adapt to changing environments. With more variation, it is more likely that some individuals in a population will possess variations of alleles that are suited for the environment. Those individuals are more likely to survive to produce offspring bearing that allele. The population will continue for more generations because of the success of these individuals. The academic field of population genetics includes several hypotheses and theories regarding genetic diversity. The neutral theory of evolution proposes that diversity is the result of the accumulation of neutral substitutions. Diversifying selection is the hypothesis that two subpopulations of a species live in different environments that select for different alleles at a particular locus. This may occur, for instance, if a species has a large range relative to the mobility of individuals within it. Frequency-dependent selection is the hypothesis that as alleles become more common, they become more vulnerable. This occurs in host–pathogen interactions, where a high frequency of a defensive allele among the host means that it is more likely that a pathogen will spread if it is able to overcome that allele.
So the correct option is 'genetic diversity- variation of genes within species'.
Multiple choice zoology biodiversity, classification and conservation levels of biodiversity environmental conservation and biodiversity biodiversity on earth and in india

The term $\alpha$ - diversity refers to

  1. Genetic diversity

  2. Community and ecosystem diversity

  3. Diversity among the plants

  4. Species diversity
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The local species pool is known as alpha diversity. It is also the diversity present within the community. The term was introduced by R. H. Whittaker. Example of such diversity includes high tree diversity throughout the Amazon Rainforests of Ecuador. Generally, gamma diversity = alpha diversity x beta diversity.

So, the correct answer is 'Species diversity'.

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

Which of the following represents the biodiversity of an area?

  1. Gene

  2. Species

  3. Ecosystem

  4. All of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In our biosphere immense diversity (or heterogeneity), exists not only at the species level but at all levels of biological organisation ranging from macromolecules within cells to biomes. Biodiversity is the term popularised by the sociobiologist Edward Wilson to describe the combined diversity at all the levels of biological organisation. The most important of them are- 
(i) Genetic diversity.
(ii) Species diversity.
(iii) Ecological diversity.

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

Number of known species of organisms on this earth is

  1. 5.0 million

  2. 3.2 million

  3. 1.7 million

  4. 1.32 million
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A great biodiversity exists on our planet. Millions of living plants and animal species are flourishing on Earth. An approximate of 1.7 million organisms are known to exist. New species are getting discovered and recorded every year.

So, the correct answer is '1.7 million'.

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

Percentage of insect species out of the total known organisms is

  1. 75

  2. 61

  3. 53

  4. 47
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Great biodiversity exists on our planet. Millions of living plants and animal species are flourishing on Earth. An approximate of 1.7 million organisms are known to exist. 61% of the total known species are of insects.

So, the correct answer is '61'.

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

Number of mammal species recorded in India is 

  1. 64

  2. 209

  3. 119

  4. 309
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Great biodiversity exists on our planet. Millions of living plants and animal species are flourishing on Earth. An approximate of 1.7 million organisms are known to exist. Out of them, 309 mammal species are recorded in India.

So, the answer is '309'.

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

Largest living lemur, Indri indri occurs in

  1. India

  2. Mauritius

  3. Fiji

  4. Madagascar
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Indri indri lemur also known as babakoto, is the largest living lemur on Earth. It as a head-and-body length of about 64–72 cm (25–28 in) and a weight of between 6 to 9.5 kg (13 to 21 lb). It occurs in Madagascar. It plays an important part in the myths of the residents of Madagascar, and legends with various stories in existence accounting for its origin. According to IUCN, it is classified as a critically endangered species.

So, the correct answer is 'Madagascar'.

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

Number of plant species estimated to be present in India is 

  1. 40,000

  2. 45,000

  3. 58,000

  4. 80,000
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

India is one of the richest countries when it comes to the diversity of plant species. Around 45,000 plant species are estimated to be present in India. There are eight main florist regions in India which are Western Himalayas, Eastern Himalayas, Assam, Indus plain, Ganges plain, the Deccan, Malabar, and the Andaman Islands. So, great efforts for protecting the immense biodiversity should be done.

So, the correct answer is '45,000'.

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

Which of the following is incorrect?

  1. Stellars Sea Cow and Passenger Pigeon got extinct due to over exploitation

  2. <p>Lantana and Eichhornia are invasive weed species in India</p>

  3. Species diversity increases from equator to poles

  4. Convention on biological diversity was held in 1992

  5. Among animals, insects are the most species rich taxonomic group
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Species diversity decreases from equator to poles. The reason lies behind the fact that the conditions for the survival of species at poles become unfavorable. The Equator has favorable conditions for the survival of wildlife. Good vegetation, sunlight, and habitat these factors are responsible for great biodiversity at the equator.

So, the correct answer is 'Species diversity increases from equator to poles'.