Competitive Exams: Zoology MCQs (Practice_Test 108 of 112)
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- Egg of eutherian mammals is
- Centrolecithal
- Toloecithal
- Macrolecithal
- Microlecithal
- In which type of cleavage do the cleavage furrows divide a small amount of active cytoplasm at the animal pole?
- Meroblastic
- Holoblastic
- Determinate
- Unequal holoblastic
- The Amnion in mammals consists of extra-embryonic
- Endoderm and somatic mesoderm
- Ectoderm and somatic mesoderm
- Ectoderm and splanchnic mesoderm
- Endoderm and splanchnic mesoderm
- As a result of natural selection, the variations favorable to a particular environment slowly accumulate in course of generations leading to
- The survival of the fittest
- The struggle for existence
- The origin of new species
- Mutations
- Consider the following conditions:
- The mimics or the imitative species occur in the same areas which are occupied by the model species.
- Mimics are usually defenseless and they mimic the offensive or harmful animals
- Mimics are always less in number than the models.
- Even if the imitation is minute, it should be external and visible
According to Wallace, the conditions necessary for protective mimicry would include
- 1 and 3
- 2 and 4
- 1,2 and 4
- 1,2, 3 and 4
- In a monohybrid cross where alleles exhibit dominant recessive relationship, the F2 shows
- 1 homozygous dominant: 1 homozygous recessive
- 3 homozygous dominant: I homozygous recessive
- 1 homozygous dominant: 3 heterozygous recessive
- 2 homozygous dominant: 2 homozygous recessive
- The cranial capacity was largest in the
- Neanderthal man
- African. Man
- Java ape man
- Peking man
- Genetic drift is stronger than selection in oceanic islands because
- There are no predators in oceanic islands
- Total population of various island species is very small.
- Humidity is very high
- The islands are usually faraway from the nearest continent
- Consider the following geological time scales:
- Proterozoic
- Palaeozoic
- Mesozoic
- Cenozoic
- Azoic
The correct sequence of these time scales from the earliest to the most recent is
- 5, 2,1, 4,3
- 5, 1,3, 2,4
- 5, 2,3, 1,4
- 5, 1,2, 3,4
- Humus is
- Totally decomposed organic matter in the soil
- Partially decomposed organic matter in the soil
- Totally decomposed organic matter in a pond
- Partially decomposed organic matter in a pond
- Consider the, following statements: In an ecosystem, energy
- Movement is unidirectional.
- Is lost irretrievably
- Movement is non-cyclic.
- Movement is from higher to lower tropic levels.
Of these statements
- 1,2 and 3 are correct
- 1,2 and 4 are correct
- 1,3 and 4 are correct
- 2,3 and 4 are correct
- Match List I with List II and select the correct answer using the codes given below the lists:
List-I List-II - Ecotone
- Benthic
- Sere
- Lotic
- Running water
- Replacement of one community by another
- Transitional zone between two commutes
- Zone found at the bottom of the sea
- A
- B
- C
- D
- 3
- 4
- 2
- 1
- 4
- 3
- 2
- 1
- 3
- 4
- 1
- 2
- 4
- 3
- 1
- 2
- Which of the following pairs are correctly matched?
- Amensalism
- A population is inhibited whereas the other populations remain unaffected
- Predation
- A population uses the other as its food
- Mutualism
- Interaction favorable to both and obligatory
Select the correct answer using the codes given below:
Codes:
- 1,2 and 3
- 1 and 2
- 1 and 3
- 2 and 3
- Match List I (Physico-chemical factors) with List II (Effect) and select the correct answer using the codes given below the lists:
List-I List-II - Temperature fluctuations
- Light fluctuations
- H + concentration of animals
- Low salinity
- Problem of osmoregulation
- Shortage of food to herbivores
- Affects distribution
- Major limiting factor
- A
- B
- C
- D
- 2
- 4
- 3
- 1
- 4
- 2
- 3
- 1
- 2
- 4
- 1
- 3
- 4
- 2
- 1
- 3
- The nature of interrelationship between corals and zooxanthellae is called
- Cleaning symbiosis
- Physiological symbiosis
- Amensalism
- Protocooperation