Biology MCQs

Page No. 103

Autophagosomes are____________?


aThose lysosomes which eat parts of their own cells to generate energy.


bThose lysosomes which eat old and worn out cellular organelles.


cLysosomes which help in extracellular digestion


dBoth a and b


View Answer Both a and b

Number of cervical vertebrae is_____________?


a5


b7


c9


d12


View Answer 7

Humming bird is an example of________________?


aCold blooded animal


bEctotherm


cEndotherm


dHeterotherm


View Answer Heterotherm

Cellulose is the major component of__________?


aPrimary wall


bSecondary wall


cMiddle lamella


dall of the above


View Answer Primary wall

Conversion of ammonia or ammonium ion into nitrites during nitrogen cycle occurs due_____________?


aRhizobium


bNitrosomonas


cNitrobacter


dPseudomonas


View Answer Nitrosomonas

Annual rainfall in grassland is about_____________?


aMore than 2500 mm


b750-1500 mm


c250-750 mm


dLess than 250 mm


View Answer 250-750 mm

The first layer of cell wall which is formed is___________?


aPrimary wall


bSecondary wall


cMiddle lamella


dAll of these


View Answer Primary wall

The productivity of aquatic ecosystem is basically determined by light and____________?


aCO2


bO2


cWater


dNutrients


View Answer Nutrients

Movement of the material across the cell membrane which does not requiring expenditure of metabolic energy is called__________?


aActive transport


bPassive transport


cCo-transport


dCounter transport


View Answer Passive transport

Ecosystem not found in Pakistan is_____________?


aTropical rain forest


bTemperate deciduous forest


cGrassland


dTundra


View Answer Tropical rain forest

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