MCAT MCQ Quiz Hub

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

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

3. Productivity of an ecosystem is indicated by
Number of plants in that ecosystem
The density of that ecosystem
Consumption of carbon dioxide and evolve of oxygen
Both a and b

4. In which zone plant community is most diverse
Limnetic zone
Littoral zone
Profundal zone
All of these

5. Which statement about profundal zone is correct?
Plants are unable to anchor but enough light penetrates to support photosynthesis
Phytoplanktons in this region are cyanobacteria
Decomposers and detritus feeders inhabit it
Water lilies are abundant

6. Eutrophication is
Process of decreasing nutrients by human activities
Adequate nutrition accelerated by human activities
Changing the trophic levels of an ecosystem by human activities
Addition of more predators in an ecosystem

7. In polluted lake which organisms dominate the community
Fish
Crustaceans
Phytoplanktons
Blue green algae

8. Evolution of vascular bundles in plants and skeleton in animals is an adaptation for
Hdrospheric ecosystem
Aquatic ecosystem
Terrestrial ecosystem
All of these

9. Development of bark in plants and skin in animals is a method for
Providing support
Protection from enemies
Reducing water loss
Helping in food production

10. Which statement is incorrect?
Average rainfall in temperate deciduous forests is 750-1500mm
Temperature of coniferous alpine and boreal forests is upto 10 degrees
Northern coniferous forests are called Taiga
Coniferous forests located at high latitude are alpine

11. Temperature of temperate deciduous forests is
4-30 degree C
45-50 degree C
20-25 degree C
5-10 degree C

12. Coniferous forests located at high altitude are called
Taiga
Alpine
Boreal
Arctic

13. Grass land in tropic climates with woody trees is called
Prairies
Savanna
Boreal
Alpines

14. Zone of lake water which is of open water near the surface is
Littoral
Limnetic
Profundal
Benthic

15. Ecosystem of Shogran is
Coniferous alpine
Boreal
Temperate deciduous
Grassland

16. Mountains of Koh Hindukush come under
Tundra
Grass land
Tropical forests
Temperate deciduous

17. Annual rainfall in grass land is
1500-2500 mm
750-1500 mm
250-750 mm
250-500 mm

18. One of the most important cause of desertification is
Floods
Wind blowing
Raining
Deforestation

19. Desert ecosystem of Mianwali is
Thar
Thal
Cholistan
None of these

20. In sub-humid tropical grassland productivity is more than
700-1500g/m2
4000g/m2
5000g/m2
6050g/m2

21. Annual rainfall in deserts is less than
150-200 mm
500-700 mm
250-500 mm
700-800mm

22. Treeless tundra of high latitude between taiga and polar ice caps is called
Northern tundra
Antarctic tundra
Arctic tundra
Polar tundra

23. The most fragile of all biomes is
Grassland
Coniferous alpine
Desert
Tundra

24. Yellowish glandular structure which produces progesterone is
Graffian follicle
Ovary
Corpus luteum
Placenta

25. Yellow cytoplasm in ascidian gives rise to
Epidermis
Muscle cells
Gut
Notochord

26. Embryonic induction is caused by part developing from
Endoderm
Ectoderm
Mesoderm
Extraembryonic layers

27. Purines and pyrimidines are in equal ration in DNA. It was indicated by
F.Miescher
Chargaff
Watson & Crick
Harshay & Chase

28. Okazaki fragments are connected together through action of
Primase
Polymerase
Helicase
Ligase

29. Sickle cell anemia is an example of
Chromosomal aberration
Insertion of gene
Deletion of gene
Point mutation

30. Test cross is used to find
Trait
Phenotype
Genotype
Ratios

31. XO-XX pattern of sex determination is present in
Grasshopper
Butterfly
Drosophila
Man

32. Sapwood is formed from
Primary xylem
Secondary xylem
Primary phloem
Secondary phloem

33. Number of cervical vertebrae is
5
7
9
12

34. Joints present in skull are example of
Fibrous joints
Cartilaginous joints
Synovial Joints
Slightly moveable joints

35. Only myosine is present in
A band
1 band
H zone
Sarcomere

36. Which of the following hormone is polypeptide in nature
Insulin
Thyroxine
ADH
Cortisone

37. Secretin inhibits production of
Gastric juice
Pancreatic juice
Bile
All of these

38. Highest form of learning is
Latent learning
Insight learning
Operant conditioning
Instinct

39. Far-red light promotes flowering in
Short day plant
Long day plant
Day neutral plant
None of these

40. In human female, fertilization commonly occurs at
Proximal part of oviduct
Distal part of oviduct
Uterus
Cervix

41. Ozone depletion occurs commonly due to
Carbon dioxide
Chlorofluorocarbons
UV rays
Deforestation

42. The productivity of aquatic ecosystem is basically determined by light and
CO2
O2
Water
Nutrients

43. Ecosystem not found in Pakistan is
Tropical rain forest
Temperate deciduous forest
Grassland
Tundra

44. Annual rainfall in grassland is about
More than 2500 mm
750-1500 mm
250-750 mm
Less than 250 mm

45. Which of the following is most constant abiotic component of ecosystem
Air
Water
Land
Gravity

46. Conversion of ammonia or ammonium ion into nitrites during nitrogen cycle occurs due to
Rhizobium
Nitrosomonas
Nitrobacter
Pseudomonas