MCQS | Ozone depletion occurs commonly due to

Question :- Annual rainfall in deserts is less than

1.150-200 mm

2.500-700 mm

3.250-500 mm

4.700-800mm

Question :- Annual rainfall in grass land is

1.1500-2500 mm

2.750-1500 mm

3.250-750 mm

4.250-500 mm

Question :- Annual rainfall in grassland is about

1.More than 2500 mm

2.750-1500 mm

3.250-750 mm

4.Less than 250 mm

Question :- Coniferous forests located at high altitude are called

1.Taiga

2.Alpine

3.Boreal

4.Arctic

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

1.Rhizobium

2.Nitrosomonas

3.Nitrobacter

4.Pseudomonas

Question :- Desert ecosystem of Mianwali is

1.Thar

2.Thal

3.Cholistan

4.None of these

Question :- 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

Question :- Ecosystem not found in Pakistan is

1.Tropical rain forest

2.Temperate deciduous forest

3.Grassland

4.Tundra

Question :- Ecosystem of Shogran is

1.Coniferous alpine

2.Boreal

3.Temperate deciduous

4.Grassland

Question :- Embryonic induction is caused by part developing from

1.Endoderm

2.Ectoderm

3.Mesoderm

4.Extraembryonic layers

Question :- 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

Question :- 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

Question :- Far-red light promotes flowering in

1.Short day plant

2.Long day plant

3.Day neutral plant

4.None of these

Question :- Grass land in tropic climates with woody trees is called

1.Prairies

2.Savanna

3.Boreal

4.Alpines

Question :- Highest form of learning is

1.Latent learning

2.Insight learning

3.Operant conditioning

4.Instinct

Question :- In human female, fertilization commonly occurs at

1.Proximal part of oviduct

2.Distal part of oviduct

3.Uterus

4.Cervix

Question :- In polluted lake which organisms dominate the community

1.Fish

2.Crustaceans

3.Phytoplanktons

4.Blue green algae

Question :- In sub-humid tropical grassland productivity is more than

1.700-1500g/m2

2.4000g/m2

3.5000g/m2

4.6050g/m2

Question :- In which zone plant community is most diverse

1.Limnetic zone

2.Littoral zone

3.Profundal zone

4.All of these

Question :- Joints present in skull are example of

1.Fibrous joints

2.Cartilaginous joints

3.Synovial Joints

4.Slightly moveable joints

Question :- Mountains of Koh Hindukush come under

1.Tundra

2.Grass land

3.Tropical forests

4.Temperate deciduous

Question :- Number of cervical vertebrae is

1.5

2.7

3.9

4.12

Question :- Okazaki fragments are connected together through action of

1.Primase

2.Polymerase

3.Helicase

4.Ligase

Question :- One of the most important cause of desertification is

1.Floods

2.Wind blowing

3.Raining

4.Deforestation

Question :- Only myosine is present in

1.A band

2.1 band

3.H zone

4.Sarcomere

Question :- Ozone depletion occurs commonly due to

1.Carbon dioxide

2.Chlorofluorocarbons

3.UV rays

4.Deforestation

Question :- 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

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

1.F.Miescher

2.Chargaff

3.Watson & Crick

4.Harshay & Chase

Question :- Sapwood is formed from

1.Primary xylem

2.Secondary xylem

3.Primary phloem

4.Secondary phloem

Question :- Secretin inhibits production of

1.Gastric juice

2.Pancreatic juice

3.Bile

4.All of these

Question :- Sickle cell anemia is an example of

1.Chromosomal aberration

2.Insertion of gene

3.Deletion of gene

4.Point mutation

Question :- 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

Question :- Test cross is used to find

1.Trait

2.Phenotype

3.Genotype

4.Ratios

Question :- The most fragile of all biomes is

1.Grassland

2.Coniferous alpine

3.Desert

4.Tundra

Question :- The productivity of aquatic ecosystem is basically determined by light and

1.CO2

2.O2

3.Water

4.Nutrients

Question :- 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

Question :- 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

Question :- Which of the following hormone is polypeptide in nature

1.Insulin

2.Thyroxine

3.ADH

4.Cortisone

Question :- Which of the following is most constant abiotic component of ecosystem

1.Air

2.Water

3.Land

4.Gravity

Question :- 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

Question :- 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

Question :- 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

Question :- XO-XX pattern of sex determination is present in

1.Grasshopper

2.Butterfly

3.Drosophila

4.Man

Question :- Yellow cytoplasm in ascidian gives rise to

1.Epidermis

2.Muscle cells

3.Gut

4.Notochord

Question :- Yellowish glandular structure which produces progesterone is

1.Graffian follicle

2.Ovary

3.Corpus luteum

4.Placenta

Question :- Zone of lake water which is of open water near the surface is

1.Littoral

2.Limnetic

3.Profundal

4.Benthic