Biology Mcqs

Single circuit heart is found in_________?

• (A)  Fishes
• (B)  Amphibians
• (C)  Reptiles
• (D)  Mammals

Answer

Submitted By :Ali Uppal

Addition of salts and other solutes from other cells into xylem sap, __________ the water potential of the xylem sap

• (A)  Increases.
• (B)  Lowers.
• (C)  Doesn’t effect.
• (D)  Maintains.

Answer

Submitted By :Ali Uppal

Symbionts which help plants in uptake of phosphorous and trace metals such as zinc and copper.

• (A)  Bacteria
• (B)  Viruses
• (C)  Fungi
• (D)  Cyanobacteria

Answer

Submitted By :Ali Uppal

Low level of CO2 favours _________ of the stomata.

• (A)  Opening
• (B)  Closure
• (C)  Both of these
• (D)  None of these

Answer

Submitted By :Ali Uppal

There are _________ hypothesis which may explain opening and closing of stomata?

• (A)  One
• (B)  Two
• (C)  Three
• (D)  Four

Answer

Submitted By :Ali Uppal

The opening and closing of stomata is directly controlled by the___________?

• (A)  Temperature
• (B)  pH
• (C)  Light
• (D)  None of these

Answer

Submitted By :Ali Uppal

Pressure flow theory was proposed by_________?

• (A)  H-Van Mohl
• (B)  Dixon
• (C)  Vander wall.
• (D)  Earnst Munch

Answer

Submitted By :Ali Uppal

Open circulatory system can contain_________?

• (A)  Red Blood Cells
• (B)  White Blood Cells
• (C)  Haemoglobin
• (D)  All of these

Answer

Submitted By :Ali Uppal

95% of the cytoplasm of red blood cells is the___________?

• (A)  Antibodies
• (B)  Hemoglobin
• (C)  Enzymes
• (D)  Proteins

Answer

Submitted By :Ali Uppal

_________ give rise to macrophages, which destroy larger particles by phagocytosis.

• (A)  Nautrophils
• (B)  Basophila
• (C)  Monocyte
• (D)  Lymphocyte

Answer

Submitted By :Ali Uppal