Tag: concept of life

Questions Related to concept of life

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

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

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

  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

Show answer
Correct Option: C
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.

Which one of the following is the most effect tool in species delimitation within the species complex?

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

  1. Cytogenesis

  2. Photochemistry

  3. RNA characterization

  4. DNA finger printing

Show answer
Correct Option: A

Which of the following ship was sailed by Darwin?

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

  1. H.M.S. Beagle

  2. C.D. Beagle

  3. H.M.S. Victory

  4. R.M.S. Lusitania

Show answer
Correct Option: A
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'

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

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

  1. Darwin

  2. Robert Hook

  3. Linneaus

  4. None of the above

Show answer
Correct Option: A
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'

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

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

  1. Isolation and mutation

  2. Competition and variation

  3. Isolation and competition

  4. Competition and mutation

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Correct Option: A

The species which have a restricted distribution are known as.

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

  1. Ecospecies

  2. Allopatric species

  3. Sympatric species

  4. Endemic species

Show answer
Correct Option: A

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

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

  1. Protozoans

  2. Eubacteria

  3. Archaebacteria

  4. Cyanobacteria

Show answer
Correct Option: C
Explanation:

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

So, the correct option is 'Archaebacteria'.

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

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

  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

Show answer
Correct Option: C
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".

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

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

  1. $H _2$

  2. $0 _2$

  3. $NH _3$

  4. CO

Show answer
Correct Option: B
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$'.

Most of the history of life concerns the evolution of

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

  1. Prokaryotes

  2. Photosynthesizers

  3. Plants and animals

  4. Eukaryotes

Show answer
Correct Option: A,D
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'.