R4RIN – MCQs, Mock Tests | MCAT Aptitude MCQ Questions - MCAT

Weather refers to

1. Short-term fluctuations in temperature, cloud cover, wind and precipitation
2. It prevails over periods of hrs or days
3. Overall patterns of weather that prevail from year to year
4. Both a and b

✅ Correct Answer: 4

Which statement about hydrospheric ecosystem is incorrect?

1. Salt water ocean and sea are the largest ecosystems on earth
2. Salt water ecosystem covers about 75% earth surface
3. Fresh water ecosystem covers less than 1% of earth surface
4. It temperature is more moderate to support life

✅ Correct Answer: 2

Productivity of an ecosystem is indicated by

1. Number of plants in that ecosystem
2. The density of that ecosystem
3. Consumption of carbon dioxide and evolve of oxygen
4. Both a and b

✅ Correct Answer: 4

In which zone plant community is most diverse

1. Limnetic zone
2. Littoral zone
3. Profundal zone
4. All of these

✅ Correct Answer: 2

Which statement about profundal zone is correct?

1. Plants are unable to anchor but enough light penetrates to support photosynthesis
2. Phytoplanktons in this region are cyanobacteria
3. Decomposers and detritus feeders inhabit it
4. Water lilies are abundant

✅ Correct Answer: 3

Eutrophication is

1. Process of decreasing nutrients by human activities
2. Adequate nutrition accelerated by human activities
3. Changing the trophic levels of an ecosystem by human activities
4. Addition of more predators in an ecosystem

✅ Correct Answer: 2

In polluted lake which organisms dominate the community

1. Fish
2. Crustaceans
3. Phytoplanktons
4. Blue green algae

✅ Correct Answer: 4

Evolution of vascular bundles in plants and skeleton in animals is an adaptation for

1. Hdrospheric ecosystem
2. Aquatic ecosystem
3. Terrestrial ecosystem
4. All of these

✅ Correct Answer: 3

Development of bark in plants and skin in animals is a method for

1. Providing support
2. Protection from enemies
3. Reducing water loss
4. Helping in food production

✅ Correct Answer: 3

Which statement is incorrect?

1. Average rainfall in temperate deciduous forests is 750-1500mm
2. Temperature of coniferous alpine and boreal forests is upto 10 degrees
3. Northern coniferous forests are called Taiga
4. Coniferous forests located at high latitude are alpine

✅ Correct Answer: 4

Temperature of temperate deciduous forests is

1. 4-30 degree C
2. 45-50 degree C
3. 20-25 degree C
4. 5-10 degree C

✅ Correct Answer: 1

Coniferous forests located at high altitude are called

1. Taiga
2. Alpine
3. Boreal
4. Arctic

✅ Correct Answer: 2

Grass land in tropic climates with woody trees is called

1. Prairies
2. Savanna
3. Boreal
4. Alpines

✅ Correct Answer: 2

Zone of lake water which is of open water near the surface is

1. Littoral
2. Limnetic
3. Profundal
4. Benthic

✅ Correct Answer: 2

Ecosystem of Shogran is

1. Coniferous alpine
2. Boreal
3. Temperate deciduous
4. Grassland

✅ Correct Answer: 3

Mountains of Koh Hindukush come under

1. Tundra
2. Grass land
3. Tropical forests
4. Temperate deciduous

✅ Correct Answer: 1

Annual rainfall in grass land is

1. 1500-2500 mm
2. 750-1500 mm
3. 250-750 mm
4. 250-500 mm

✅ Correct Answer: 3

One of the most important cause of desertification is

1. Floods
2. Wind blowing
3. Raining
4. Deforestation

✅ Correct Answer: 4

Desert ecosystem of Mianwali is

1. Thar
2. Thal
3. Cholistan
4. None of these

✅ Correct Answer: 2

In sub-humid tropical grassland productivity is more than

1. 700-1500g/m2
2. 4000g/m2
3. 5000g/m2
4. 6050g/m2

✅ Correct Answer: 2

Annual rainfall in deserts is less than

1. 150-200 mm
2. 500-700 mm
3. 250-500 mm
4. 700-800mm

✅ Correct Answer: 3

Treeless tundra of high latitude between taiga and polar ice caps is called

1. Northern tundra
2. Antarctic tundra
3. Arctic tundra
4. Polar tundra

✅ Correct Answer: 3

The most fragile of all biomes is

1. Grassland
2. Coniferous alpine
3. Desert
4. Tundra

✅ Correct Answer: 4

Yellowish glandular structure which produces progesterone is

1. Graffian follicle
2. Ovary
3. Corpus luteum
4. Placenta

✅ Correct Answer: 3

Yellow cytoplasm in ascidian gives rise to

1. Epidermis
2. Muscle cells
3. Gut
4. Notochord

✅ Correct Answer: 2

Embryonic induction is caused by part developing from

1. Endoderm
2. Ectoderm
3. Mesoderm
4. Extraembryonic layers

✅ Correct Answer: 3

Purines and pyrimidines are in equal ration in DNA. It was indicated by

1. F.Miescher
2. Chargaff
3. Watson & Crick
4. Harshay & Chase

✅ Correct Answer: 2

Okazaki fragments are connected together through action of

1. Primase
2. Polymerase
3. Helicase
4. Ligase

✅ Correct Answer: 4

Sickle cell anemia is an example of

1. Chromosomal aberration
2. Insertion of gene
3. Deletion of gene
4. Point mutation

✅ Correct Answer: 4

Test cross is used to find

1. Trait
2. Phenotype
3. Genotype
4. Ratios

✅ Correct Answer: 3

XO-XX pattern of sex determination is present in

1. Grasshopper
2. Butterfly
3. Drosophila
4. Man

✅ Correct Answer: 1

Sapwood is formed from

1. Primary xylem
2. Secondary xylem
3. Primary phloem
4. Secondary phloem

✅ Correct Answer: 2

Number of cervical vertebrae is

1. 5
2. 7
3. 9
4. 12

✅ Correct Answer: 2

Joints present in skull are example of

1. Fibrous joints
2. Cartilaginous joints
3. Synovial Joints
4. Slightly moveable joints

✅ Correct Answer: 1

Only myosine is present in

1. A band
2. 1 band
3. H zone
4. Sarcomere

✅ Correct Answer: 3

Which of the following hormone is polypeptide in nature

1. Insulin
2. Thyroxine
3. ADH
4. Cortisone

✅ Correct Answer: 3

Secretin inhibits production of

1. Gastric juice
2. Pancreatic juice
3. Bile
4. All of these

✅ Correct Answer: 1

Highest form of learning is

1. Latent learning
2. Insight learning
3. Operant conditioning
4. Instinct

✅ Correct Answer: 2

Far-red light promotes flowering in

1. Short day plant
2. Long day plant
3. Day neutral plant
4. None of these

✅ Correct Answer: 1

In human female, fertilization commonly occurs at

1. Proximal part of oviduct
2. Distal part of oviduct
3. Uterus
4. Cervix

✅ Correct Answer: 1

Ozone depletion occurs commonly due to

1. Carbon dioxide
2. Chlorofluorocarbons
3. UV rays
4. Deforestation

✅ Correct Answer: 2

The productivity of aquatic ecosystem is basically determined by light and

1. CO2
2. O2
3. Water
4. Nutrients

✅ Correct Answer: 4

Ecosystem not found in Pakistan is

1. Tropical rain forest
2. Temperate deciduous forest
3. Grassland
4. Tundra

✅ Correct Answer: 1

Annual rainfall in grassland is about

1. More than 2500 mm
2. 750-1500 mm
3. 250-750 mm
4. Less than 250 mm

✅ Correct Answer: 3

Which of the following is most constant abiotic component of ecosystem

1. Air
2. Water
3. Land
4. Gravity

✅ Correct Answer: 4

Conversion of ammonia or ammonium ion into nitrites during nitrogen cycle occurs due to

1. Rhizobium
2. Nitrosomonas
3. Nitrobacter
4. Pseudomonas

✅ Correct Answer: 2

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