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Question Count: 573

Question:

The gas which was absent in the environment during the origin of life is –

  1. Hydrogen
  2. Oxygen
  3. Methane
  4. Ammonia

Life Science Evolution WBBSE 1 2017

Answer:

(b) Oxygen Explanation: The gas which was absent in the environment during the origin of life is oxygen.
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Question ID: 429

Uploaded on: October 7, 2024

Question:

The feature of analogues organ is –

  1. Differences in origin and function are also different
  2. Different in origin but function are same
  3. Indicates divergent evolution
  4. Identical in origin and structure

Life Science Evolution WBBSE 1 2017

Answer:

(b) Different in origin but function are same Explanation: Analogous organs are organs that have different origins but perform the...
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Question ID: 430

Uploaded on: October 7, 2024

Question:

Which of the following absorbs the gas of the swim bladder in bony fishes –

  1. Red gland
  2. Anterior chamber
  3. Gastric gland
  4. Retia mirabilia

Life Science Adaptation WBBSE 1 2017

Answer:

(a) red gland Explanation: The gas in the swim bladder of bony fishes is absorbed by a structure called the...
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Question ID: 431

Uploaded on: October 7, 2024

Question:

Which of the following phase of the nitrogen cycle Pseudomonas is associated with-

  1. Nitrogen fixation
  2. Nitrification
  3. Denitrification
  4. Ammonification

Life Science Nitrogen Cycle WBBSE 1 2017

Answer:

(c) Denitrification Explanation: Pseudomonas is associated with the phase of the nitrogen cycle known as denitrification.
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Question ID: 432

Uploaded on: October 7, 2024

Question:

One endangered species of the Eastern Himalayas biodiversity hotspot is –

  1. Lion-tailed macaque
  2. Orangutan
  3. Red panda
  4. Nilgiri thar

Life Science Biodiversity and Its Conservation WBBSE 1 2017

Answer:

(c) Red panda Explanation: The red panda is a small, furry mammal that is native to the Eastern Himalayas and...
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Question ID: 433

Uploaded on: October 7, 2024

Question:

The diseases associated with air pollution are –

  1. Diarrhoea, Typhoid, Hepahepatitis,
  2. Hepahepatitis, Bronchitis, Deafness
  3. Bronchitis, Asthma, Lung cancer
  4. Lung cancer, Polio, Malaria

Life Science Environment and Human Pollution WBBSE 1 2017

Answer:

(c) Bronchitis, Asthma, Lung cancer
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Question ID: 434

Uploaded on: October 7, 2024

Question:

Fill in the blanks:

The process of necessary adjustment of the lens's focal length in human eyes is called ____

Life Science Nervous System WBBSE 1 2017

Answer:

The process of necessary adjustment of the focal length of the lens in human eyes is called accommodation.
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Question ID: 435

Uploaded on: October 7, 2024

Question:

Fill in the blanks

Adenine is a __ type of nitrogenous base.

Life Science Cell division and Cell cycle WBBSE 1 2017

Answer:

Adenine is a purinic type of nitrogenous base.
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Question ID: 436

Uploaded on: October 7, 2024

Question:

Fill in the blanks

__ is a disease created by sex-linked genes.

Life Science Some Common Genetic Diseases WBBSE 1 2017

Answer:

Hemophilia is a disease created by sex-linked genes.
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Question ID: 437

Uploaded on: October 7, 2024

Question:

Fill in the blanks

The earliest ancestor in the evolution of horses is ___.

Life Science Evolution WBBSE 1 2017

Answer:

The earliest ancestor in the evolution of horses is Hyracotherium.
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Question ID: 438

Uploaded on: October 7, 2024

Question:

Fill in the blanks

The earliest ancestor in the evolution of horses is ___.

Life Science Evolution WBBSE 1 2017

Answer:

The earliest ancestor in the evolution of horses is Hyracotherium.
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Question ID: 439

Uploaded on: October 7, 2024

Question:

Fill in the blanks

An inflammable greenhouse gas produced from the paddy field is __

Life Science Evolution WBBSE 1 2017

Answer:

An inflammable greenhouse gas produced from the paddy field is methane.
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Question ID: 440

Uploaded on: October 7, 2024

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