Tag: red data book

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Multiple choice biology main natural resources classification of threatened species red data book conservation of wildlife

Introduction of alien species into new area poses a threat to extinction of indigenous species due to 

  1. their high nutrient requirement

  2. their symbiotic relationship

  3. absence of their natural predators

  4. more intraspecific competition.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In the absence of their natural predators, exotic species flourish better and pose a threat to indigenous species.

Multiple choice biology main natural resources classification of threatened species red data book conservation of wildlife

Amongst the animals groups given below, which one has the highest percentage of endangered species? 

  1. Insects

  2. Mammals

  3. Amphibians

  4. Reptiles
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
According to the IUCN regional red listing guidelines, 12% all the birds species, 23% all mammals species, 31% all gymnosperms species and 32% all amphibian species in world face the threat of extinctions and have a highest percentage of endangered species, and the threats including habitat loss, fragmentation and degradation, pollution, climate change, and invasive alien species.
So, the correct answer is ‘Amphibians’.
Multiple choice biology main natural resources classification of threatened species red data book conservation of wildlife

The extinction of passenger pigeon was due to 

  1. increased number of predatory birds.

  2. over exploitation by humans.

  3. non-availability of the food

  4. bird flu virus infection.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The passenger pigeon or wild pigeon (Ectopistes migratorius) is an extinct species of pigeon that was endemic to North America. Its common name is derived from the French word passager, meaning "passing by", due to the migratory habits of the species. The scientific name also refers to its migratory characteristics. The morphologically similar mourning dove (Zenaida macroura) was long thought to be its closest relative, and the two were at times confused, but genetic analysis has shown that the genus Patagioenas is more closely related to it than the Zenaida doves. The main reasons for the extinction of the passenger pigeon were the massive scale of hunting, the rapid loss of habitat, and the extremely social lifestyle of the bird, which made it highly vulnerable to the former factors. Deforestation was driven by the need to free land for agriculture and expanding towns, but also due to the demand for lumber and fuel. Though there are still large woodland areas in eastern North America, which support a variety of wildlife, it was not enough to support the vast number of passenger pigeons needed to sustain the population.  As the flocks dwindled in size, the passenger pigeon population decreased below the threshold necessary to propagate the species.

So the correct option is 'over exploitation by humans'.

Multiple choice biology main natural resources classification of threatened species red data book conservation of wildlife

A similarity among black buck, gharial and rhinoceros and marsh crocodile is that they are

  1. Endangered species

  2. Oviparous

  3. Animals with thick chitinous skin

  4. Found in forests of north-East India
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The similarity between black buck, gharial, rhinoceros and marsh crocodile is that they all are endangered species as they are likely to extinct in near future.

Multiple choice biology main natural resources classification of threatened species red data book conservation of wildlife

Match Column I with Column II and select the correct option from the codes given below.

Column I Column II
(a) Endemic species (i) Species that exist in very small number
(b) Endangered species (ii) Species found exclusively in a particular area
(c) Vulnerable species (iii) Species that are likely to become endangered
(d) Rare species (iv) Species that are likely to get extinct in the near future

  1. a- (ii), b- (iii), c- (i), d- (iv)

  2. a- (iv), b- (ii), c- (iii), d- (i)

  3. a- (iii), b- (i), c- (ii), d- (iv)

  4. a- (ii), b- (iv), c- (iii), d- (i)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

An endemic species is a plant or animal species with a habitat restricted to one area. An endangered species is a species which are less in number and can be extinct in near future. A vulnerable species is a species of animals or plants, which are likely to become endangered unless something changes. A rare species is a group of organisms that are very uncommon, scarce, or infrequently encountered. Thus, the correct answer is option D.


Multiple choice biology main natural resources classification of threatened species red data book conservation of wildlife

Which of the following is an extinct species?

  1. Duck

  2. Dodo

  3. Dinosaur

  4. Both B and C
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The dodo (Raphus cucullatus) is an extinct flightless bird that was endemic to the island of Mauritius, east of Madagascar in the Indian Ocean. About 65 million years ago the greatest mass extinction in earth history occurred, resulting in the loss of the dinosaurs.

Therefore, the correct answer is option D.