Tag: theories of the origin of life

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Questions Related to theories of the origin of life

Multiple choice biology concept of life theories of the origin of life origin of life the origin of cells and cell division

Assertion : We have lost all the direct evidences of origin of life.

Reason : The person responsible to protect the evidences were not skilled.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion

  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion

  3. If the assertion is true but the reason is false

  4. If both the assertion and reason are false

  5. If the assertion is false but reason is true
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

During the profound changes that have been taking place since the remote past we have lost the direct evidences of origin of life. Due to these changes, the scientists, though skilled were not able to protect the evidence.

Multiple choice biology concept of life theories of the origin of life origin of life the origin of cells and cell division

Which of the following ship was sailed by Darwin?

  1. H.M.S. Beagle

  2. C.D. Beagle

  3. H.M.S. Victory

  4. R.M.S. Lusitania
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Charles Darwin’s five-year voyage in the early 1830s was on H.M.S. Beagle. It has become legendary, as insights gained by the Darwin on his trip to exotic places like Galapagos island greatly influenced his masterwork, the book "On the Origin of Species"

So, the correct answer is 'H.M.S. Beagle'

Multiple choice biology concept of life theories of the origin of life origin of life the origin of cells and cell division

Living organisms on the Earth have evolved gradually from one form to another over the million years. This statement was given by

  1. Darwin

  2. Robert Hook

  3. Linneaus

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Most of the life forms that we see today have arise by changes that has occurred over the time which allow the organism a better survival. This idea was given by Charles Darwin in 1859 in his book 'The origin of species'
So, the correct answer is 'Darwin'
Multiple choice biology concept of life theories of the origin of life origin of life the origin of cells and cell division

Which of the following factors are involved in the formation of new species?

  1. Isolation and mutation

  2. Competition and variation

  3. Isolation and competition

  4. Competition and mutation
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Speciation often requires reproductive isolation to prevent gene flow between populations, while mutations provide the genetic variation necessary for natural selection to act upon.

Multiple choice biology concept of life theories of the origin of life origin of life the origin of cells and cell division

Choose the correct answers from the alternatives given.
Which of the following live in habitats much like those of the early Earth?

  1. Protozoans

  2. Eubacteria

  3. Archaebacteria

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

The fossil shapes almost 3.5 billion years ago, identify them as archaea.

So, the correct option is 'Archaebacteria'.

Multiple choice biology concept of life theories of the origin of life origin of life the origin of cells and cell division

Choose the correct answers from the alternatives given .
Which of the following statements is true?

  1. It took so long for prokaryote evolution because the primitive atmosphere screened out the ultraviolet radiation from the Sun

  2. Primitive atmosphere was an oxidising one and todays is a reducing one, making photosynthesis possible

  3. Reducing primitive atmosphere contributed to the origin of life, and the oxidising one of today would hinder it

  4. Primitive atmosphere contains 20% oxygen, just like it is today
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The early atmosphere of earth was made of nitrogen and carbon dioxide gases before life began. When the photosynthesizing organisms multiplied then the carbon dioxide was replaced by oxygen. So, the correct option is "reducing primitive atmosphere contributed to the origin of life, and the oxidizing one of today would hinder it".

Multiple choice biology concept of life theories of the origin of life origin of life the origin of cells and cell division

Which of the following gases probably least abundant in the early atmosphere?

  1. $H _2$
  2. $0 _2$
  3. $NH _3$

  4. CO
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Scientists believe that the Earth was formed about 4.5 billion years ago. Its early atmosphere was probably formed from the gases given out by volcanoes. It is believed that there was intense volcanic activity for the first billion years of the Earth's existence. The early atmosphere was probably mostly carbon dioxide, with little or no oxygen. There were smaller proportions of water vapour, ammonia and methane. As the Earth cooled down, most of the water vapour condensed and formed the oceans. 
So the correct option is 'O$ _2$'.
Multiple choice biology concept of life theories of the origin of life origin of life the origin of cells and cell division

Most of the history of life concerns the evolution of

  1. Prokaryotes

  2. Photosynthesizers

  3. Plants and animals

  4. Eukaryotes
Reveal answer Fill a bubble to check yourself
A,D Correct answer
Explanation

  • Cells are divided into two main classes, initially defined by whether they contain a nucleus. 
  • Prokaryotic cells (bacteria) lack a nuclear envelope. 
  • Prokaryotic cells are generally smaller and simpler than eukaryotic cells; in addition to the absence of a nucleus, their genomes are less complex and they do not contain cytoplasmic organelles or a cytoskeleton. 
  • Phospholipids are the basic components of all present-day biological membranes, including the plasma membranes of both prokaryotic and eukaryotic cells. 
  • The key characteristic of the phospholipids that form membranes is that they are amphipathic molecules, meaning that one portion of the molecule is soluble in water and another portion is not.
So the correct option is 'prokaryotes and eukaryotes'.