Humming bird is an example of________________?
A. Cold blooded animal
B. Ectotherm
C. Endotherm
D. Heterotherm
Biology Mcqs
Cellulose is the major component of__________?
Cellulose is the major component of__________?
A. Primary wall
B. Secondary wall
C. Middle lamella
D. all of the above
Conversion of ammonia or ammonium ion into nitrites during nitrogen cycle occurs due_____________?
Conversion of ammonia or ammonium ion into nitrites during nitrogen cycle occurs due_____________?
A. Rhizobium
B. Nitrosomonas
C. Nitrobacter
D. Pseudomonas
Annual rainfall in grassland is about_____________?
Annual rainfall in grassland is about_____________?
A. More than 2500 mm
B. 750-1500 mm
C. 250-750 mm
D. Less than 250 mm
The first layer of cell wall which is formed is___________?
The first layer of cell wall which is formed is___________?
A. Primary wall
B. Secondary wall
C. Middle lamella
D. All of these
The productivity of aquatic ecosystem is basically determined by light and____________?
The productivity of aquatic ecosystem is basically determined by light and____________?
A. CO2
B. O2
C. Water
D. Nutrients
Movement of the material across the cell membrane which does not requiring expenditure of metabolic energy is called__________?
Movement of the material across the cell membrane which does not requiring expenditure of metabolic energy is called__________?
A. Active transport
B. Passive transport
C. Co-transport
D. Counter transport
Ecosystem not found in Pakistan is_____________?
Ecosystem not found in Pakistan is_____________?
A. Tropical rain forest
B. Temperate deciduous forest
C. Grassland
D. Tundra
Which of the following is most constant abiotic component of ecosystem___________?
Which of the following is most constant abiotic component of ecosystem___________?
A. Air
B. Water
C. Land
D. Gravity
Percentage of proteins in cell membrane is____________?
Percentage of proteins in cell membrane is____________?
A. 20-40%
B. 40-50%
C. 60-80%
D. 80-100%