Biology MCQS

621. _ supported the theory of special creation?
A: Linnaeus
B: Aristotle
C: Mendel
D: Lamarck

622. Percentage of proteins in the cell membrane is____________?
A: 20-40%
B: 40-50%
C: 60-80%
D: 80-100%

623. Which of the following is the most constant abiotic component of the ecosystem___________?
A: Air
B: Water
C: Land
D: Gravity

624. Ecosystem not found in Pakistan is_____________?
A: Tropical rainforest
B: Temperate deciduous forest
C: Grassland
D: Tundra

625. Movement of the material across the cell membrane which does not require the expenditure of metabolic energy is called__________?
A: Active transport
B: Passive transport
C: Co-transport
D: Counter transport

626. The productivity of the aquatic ecosystem is basically determined by light and____________?
A: CO2
B: O2
C: Water
D: Nutrients

627. The first layer of the cell wall which is formed is___________?
A: Primary wall
B: Secondary wall
C: Middle lamella
D: All of these

628. Annual rainfall in grassland is about_____________?
A: More than 2500 mm
B: 750-1500 mm
C: 250-750 mm
D: Less than 250 mm

629. During meiosis when does synapsis occur?
(A) Prophase 1
B: Metaphase 1
C: Anaphase 1
D: Pachytene

630. _ senses are used for observation.
(A) 3
B: 4
(C) 5
D: 6