A. Cold blooded animal
B. Ectotherm
C. Endotherm
D. Heterotherm
Biology
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………….?
A. Rhizobium
B. Nitrosomonas
C. Nitrobacter
D. Pseudomonas
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………..?
A. Primary wall
B. Secondary wall
C. Middle lamella
D. All of these
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……….?
A. Active transport
B. Passive transport
C. Co-transport
D. Counter transport
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………..?
A. Air
B. Water
C. Land
D. Gravity
Percentage of proteins in cell membrane is…………?
A. 20-40%
B. 40-50%
C. 60-80%
D. 80-100%