Tag: biology

Questions Related to biology

Consider the following statements (A) - (D) each with one or two blanks.
(A) Bears go into (a) during winter to (b) cold weather.
(B) A conical age pyramid with a broad base represents (c) human population.
(C) A wasp pollinating a fig flower is an example of (d)
(D) All area with high levels of species richness is known as (e) 
Which one of the following options gives the correct fill ups to the respective blank numbers from (a) to (e) in the statements.

biology adapting to a habit extreme adaptations adaptive features adaptations of organisms

  1. (b)- Stable, (d)- Commensalism, (a)- Mesh

  2. (a)- Aestivation, (d)- Escape, (c)- Stable, (d)- Mutualism

  3. (c)- Expanding, (d)- Commensalism, (e)- Biodiversity park

  4. (a)- Hibernation, (b)- Escape, (c)- Expanding, (d)- Obligate mutualism

Show answer
Correct Option: D
Explanation:

Bears usually go into hibernation (a) during winter to escape (b) cold weather. (Hibernation is a state of inactivity and metabolic depression in endotherms. Hibernation refers to a season of heterothermy that is characterized by low body temperature, slow breathing and heart rate, and low metabolic rate.)

A conical age pyramid with a broad base represents expanding (c) human population. It shows high population growth.
A wasp pollinating a fig flower is an example of obligate mutualism (d). (It is a type of mutualism in which the species involved are in close proximity and interdependent with one another in a way that one cannot survive without the other.)
All area with high levels of species richness is known as biodiversity park (e).
Therefore, the correct answer is option D.

The biological adaptation that allows frogs to obtain water for their survival during conditions of water scarcity is the

biology adapting to a habit extreme adaptations adaptive features adaptations of organisms

  1. Presence of modified tongue that acts like a sponge to suck water from damp soils

  2. Presence of water channels in the skin by which they absorb water from their surroundings

  3. Presence of ciliated oesophagus that helps in separating water from ingested particular matter

  4. Selective feeding on plants with large amount of water that would fulfill the water requirement

Show answer
Correct Option: B
Explanation:

In the conditions of water scarcity, the frogs show biological adaptation to reduce water loss or obtain water from the surroundings. The skin is modified to contain water channels. The water is absorbed from the surroundings through the skin and the water channels makes the water available for the survival. 

Thus, the correct answer is option B. 

Ozone belongs to which groups of the periodic table?

biology natural resources - air, water and land group 16 elements - general properties group 16 elements - trends in chemical properties group 16 elements

  1. IV

  2. V

  3. VI

  4. VII

Show answer
Correct Option: C
Explanation:

$O _3$ is an allotrope of oxygen and hence, it belongs to VI A group.

Dodo is a

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

  1. Rare species

  2. Extinct species

  3. Endangered species

  4. Vulnerable species

Show answer
Correct Option: B
Explanation:

Dodo was a bird which cannot fly. This bird was found in the regions of Madagascar. The birds were transported by humans to different places. The bird got extinct about in the years of 1688-1700 because they were commonly used as food by the Dutch people. The fossils of the bird were found in the regions near Madagascar. There are cast and molds made of this bird which is present in the museums.

Thus, the correct answer is option B. 

The death of the last individual of a species is called as

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

  1. Extinction

  2. Rare

  3. Endangered

  4. Threatened

Show answer
Correct Option: A
Explanation:

The species that no more exist on earth are known as extinct species Eg. dinosaurs. The species which are on the verge of extinction and which are required to be protected and conserved are known as endangered or threatened species, Eg. tiger. A rare species is a group of organisms that are very uncommon, scarce, or infrequently encountered. Thus, the correct answer is option A.

What is an endangered animal?

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

  1. An animal on the verge of extinction

  2. An animal which is extinct

  3. An animal that is dangerous to humans

  4. An animal that is dangerous to other animals

Show answer
Correct Option: A
Explanation:

  • Endangered species is a species of animals or plants that are at risk of extinction in the near future due to the extensive activities of the human. The number of these species is drastically reduced. 
  • If these species are not conserved or taken care of, then these species will be extinct. 
  • Example, one horned Rhinoceros, Bengal tiger etc

So, the correct answer is 'An animal on the verge of extinction'

RNAi is the important cellular defence in

expression of gene inherited changes biology

  1. Prokaryotes

  2. Eukaryotes

  3. All living organism

  4. Viruses

Show answer
Correct Option: B
Explanation:

Inactivation of RNA by using another RNA is called RNA interference(RNAi). It is used in pest control in tomato plant. It is a cellular defence method. It is applicable to eukaryotes only.

So, the correct option is ‘Eukaryotes’.

Lac-operon is related with _______

expression of gene inherited changes biology

  1. Lactose metabolism

  2. Starch metabolism

  3. Lipid metabolism

  4. Protein metabolism

Show answer
Correct Option: A
Explanation:

Lac-operon refers to the group of genes present in bacteria that are responsible for the metabolism of lactose. There are three genes called LacZ, LacY and LacA that code of beta-galactosidase, permease and transacetylase respectively. They have a common promoter, operator and a regulator gene.

Hence, the correct answer is 'Lactose metabolism'

In prokaryotes, the predominant site for control of gene expression is 

expression of gene inherited changes biology

  1. Transcription Initiation

  2. Processing level

  3. Transport of mRNA

  4. Translation level

Show answer
Correct Option: A
Explanation:

A DNA segment that contributes to phenotype/function is called gene. In prokaryotes, the predominant site for control of gene expression is at Transcription level, where as in eukaryotes, control of gene expression occurs at transcription level, processing level, transport of mRNA, translation level.

So, the correct option is ‘Transcription intiations’.

In E.coli _________________________ genes are grouped in  _______________ operon.

expression of gene inherited changes biology

  1. $64,20$

  2. $3,100$

  3. $34,10$

  4. $260,75$

Show answer
Correct Option: A
Explanation:

In E.coli, a single circular, nacked dsDNA molecule act as a genetic material. It contains 64 genes and are grouped into 20 operons.

So, the correct option is ’64, 20’.