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Question Count: 573

Question:

What would be the phenotypic ratio in the F2 generation of a monohybrid cross in case of incomplete dominance —

  1. 3:1
  2. 2:1:1
  3. 9:3:3:1
  4. 1:2:1

Life Science Heredity WBBSE 1 2018

Answer:

(d) 1:2:1
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Question ID: 501

Uploaded on: October 11, 2024

Question:

Which one of the following is the intraspecific struggle for the same food —

  1. struggle between Vulture and Hyaena
  2. struggle between Eagle and Kite
  3. struggle among the members of Rohu fish in the pond
  4. struggle between Egret and Kingfisher

Life Science Evolution WBBSE 1 2018

Answer:

(c) struggle among the members of Rohu fish in the pond
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Question ID: 502

Uploaded on: October 11, 2024

Question:

Which of the following changes did not occur during the course of the evolution of horse —

  1. Lengthening of limbs
  2. Increase in the length and thickness of all digits in limbs
  3. Increase in the length and thickness of only the third digit in limbs
  4. Increase in size of the -whole body

Life Science Evolution WBBSE 1 2018

Answer:

(d) Increase in size of the -whole body
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Question ID: 503

Uploaded on: October 11, 2024

Question:

According to the opinion of scientists the prebiotic Environment of the earth that led to the origin of life was like this —

  1. Hot dilute. soup in tie seawater
  2. Cold dilute soup in the seawater
  3. Cold dilute soup in the river water
  4. Hot dilute soup in the groundwater

Life Science Evolution WBBSE 1 2018

Answer:

(a) Hot dilute soup in tie seawater
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Question ID: 504

Uploaded on: October 11, 2024

Question:

Which one of the following microbes takes part in nitrification?

  1. Nitrosomonas
  2. Azotobacter
  3. Pseudomonas
  4. Thiobacillus

Life Science Nitrogen Cycle WBBSE 1 2018

Answer:

(a) Nitrosomonas
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Question ID: 505

Uploaded on: October 11, 2024

Question:

An example of Ex-situ conservation is

  1. Sundarbans Tiger Reserve
  2. Corbet National Park
  3. Nilgiri Biosphere Reserve
  4. Cryopreservation 

Life Science Biodiversity and Its Conservation WBBSE 1 2018

Answer:

(d) Cryopreservation
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Question ID: 506

Uploaded on: October 11, 2024

Question:

Which of the following effects is the result of water pollution—

  1. Global warming
  2. Eutrophication
  3. Deafness
  4. Bronchitis

Life Science Environment and Human Pollution WBBSE 1 2018

Answer:

(b) Eutrophication
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Question ID: 507

Uploaded on: October 11, 2024

Question:

Due to a deficiency of Iodine, the synthesis of hormones is hampered ____

Life Science Animal Hormones WBBSE 1 2018

Answer:

Thyroid
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Question ID: 508

Uploaded on: October 11, 2024

Question:

During embryonic development and growth in vertebrates ____ cell division take place.

Life Science Cell division and Cell cycle WBBSE 1 2018

Answer:

Mitosis
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Question ID: 509

Uploaded on: October 11, 2024

Question:

Fill in the blanks

The differences of Pea Plant may show the same Phenotype ____

Life Science Heredity WBBSE 1 2018

Answer:

Genotype
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Question ID: 510

Uploaded on: October 11, 2024

Question:

Fill in the blanks

Homologous organs evolve due to ____ evolution.

Life Science Evolution WBBSE 1 2018

Answer:

Divergent
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Question ID: 511

Uploaded on: October 11, 2024

Question:

Fill in the blanks

The name of one exotic species, that affects the local biodiversity, is the ____.

Life Science Biodiversity and Its Conservation WBBSE 1 2018

Answer:

Amazon sailfin catfish
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Question ID: 512

Uploaded on: October 11, 2024

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