Tag: biology

Quizzes (1160) Questions (12174)

Questions Related to biology

Multiple choice biology endocrine glands different type of gland glands in humans coordination in human beings- chemical control

Which among the following is incorrect about the endocrine system?

  1. It relies on chemical messengers that travel through the bloodstream.

  2. It is a control system that has extremely rapid effects on the body.

  3. The hormones affect only certain "target" organs.

  4. It is involved in maintaining body homeostasis.

  5. Its organs secrete hormones directly into the bloodstream, rather than through ducts
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The endocrine system includes ductless glands that secrete hormones and release them directly into the blood. This makes option E correct about the system. Second messengers are the low molecular weight molecules that serve to transmit and amplify the signal of hormones, the first messenger, to initiate the downstream enzyme cascade inside the cell. Second messenger pathway is activated by binding of hormones to the receptor molecules present on the surface of target cells only. 

Hormones secreted by various endocrine glands maintain the normal functioning of target tissues/organs and thereby help to maintain homeostasis. 
Endocrine system effects are slow but long term. 
Therefore, the correct answer is option B.

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

Asiatic lion (Panthera leo persica) is now

  1. Endangered

  2. Extinct in wild

  3. Vulnerable

  4. Critically endangered
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Endangered species is a species facing a high risk of extinction in the near future due to a decrease in its habitat, excessive predation or poaching. 
The population of vulnerable species is presently sufficient but can become endangered in near future due to loss of habitat.
Critically endangered taxon is facing a high risk of extinction in the wild and can become extinct any moment in the immediate future. 
Lion (Panthera leo persica) is at a higher risk of extinction due to loss of habitat.

Thus, the correct answer is option A.

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

Which of the following animal has become almost extinct in India?

  1. Wolf

  2. Rhinoceros

  3. Hippopotamus

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

Until the 20th century, the asiatic cheetah was quite common and roamed all the way from Arabia to Iran, Afghanistan and India. 

By the beginning of the twentieth century, the species was already heading for extinction in many areas. Reintroduction of the cheetah in India involves the artificial re-establishment of a population of cheetahs into areas, where they had previously existed.

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

A taxon facing an extremely high risk of extinction in wild in the near future is called as

  1. Critical endangered

  2. Endangered

  3. Vulnerable

  4. Extinct in wild
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Extinct: A species those having no living members.
Endangered: A species those are facing high risk of extinction in the wild in near future.
Critically endangered:  A taxon is critically endangered when it is facing an extremely high risk of extinction in the wild in the immediate future.
Vulnerable: A taxon is vulnerable when it is not critically endangered or endangered but is facing a high risk of extinction in the medium-term future.
Thus, the correct answer is option B.

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

A tree species in Mauritus failed to reproduce because of the extinction of a fruit-eating bird. Which one of the following was that bird?

  1. Dove

  2. Dodo

  3. Condor

  4. Skua
Reveal answer Fill a bubble to check yourself
B 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. It became extinct in 14th century from Mauritius because of large-scale hunting. Dodo was helpful in pollinating and propagating seed of this tree species. Subfossil remains show the dodo was about 1 metre (3 ft 3 in) tall and may have weighed 10.6–21.1 kg (23–47 lb) in the wild. 

Therefore, the correct answer is option B.

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

One of the ex-situ conservation methods for endangered species is

  1. Wildlife sanctuaries

  2. Biosphere reserves

  3. Cryopreservation

  4. National parks
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Ex-situ conservation is the preservation of components of biological diversity outside their natural habitats. Cryopreservation is the only option here where the species are preserved at very low temperature to preserve structurally intact living cells and tissues.

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

Which of the following species is very near to extinction, if conservation measures are not promptly taken?

  1. Threatened species

  2. Rare species

  3. Endangered species

  4. Vulnerable species
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Endangered species is a species facing a high risk of extinction in the near future due to a decrease in its habitat, excessive predation or poaching e.g., Ailurus fulgens (Red Panda), Bentinckia nicobarica. 

Some other examples are Blue Whale, Asiatic wild ass and Lion-tailed Macaque.
Vulnerable species are those for which presently the population is sufficient but is undergoing depletion due to some factors so that it is facing the risk of extinction in the medium term.
Rare species are species with naturally small populations, either localised or thinly scattered.
Threatened species include critically endangered, endangered and vulnerable.
Therefore, the correct answer is option C.

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

Dodo, an extinct flightless bird, belonged to

  1. Mauritius

  2. Lakshadweep

  3. Canada

  4. Iceland
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The IUCN 'Red List' (2004) documents the extinction of 784 species (including 338 vertebrates, 359 invertebrates and 87 plants) in the last 500 years. Some examples of recent extinctions include the dodo (Mauritius), quagga (Africa), thylacine (Australia), stellers sea cow (Russia) and three subspecies (Bali, Javan, Caspian) of tiger.

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

The bird 'Dodo' became extinct because of 

  1. Its beautiful feathers

  2. Its flesh

  3. Its curved beak

  4. Its melodious songs
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The dodo is an extinct flightless bird, that was endemic to the island of Mauritius, east of Madagascar in the Indian Ocean. The scientific name is Raphus cucullatus. The Dodo was first described in 1601 from the island of Mauritius. By 1681 it had become extinct as a result of hunting by Dutch colonists. It became extinct becuase of its flesh and the bird was flightless too, which increased its predation and poaching.

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

Which of the following birds have become extinct recently?

  1. Carolina parakeet

  2. Peacock

  3. Kirtland warbler

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

Reed buntings are some of the most 'adulterous' birds on record. As a result, over half the chicks in a nest may not have been fathered by the female's mate. Feigning injury to lure potential predators away from their nests, which are built dangerously close to the ground albeit amongst dense vegetation, is one of the ways that parent birds protect their young. Reed buntings are wetland birds and widespread throughout central and northern Europe.