Biology Mcqs

Deoxygenated blood first enters in _________ part in fishes?

• (A)  Sinus venosus
• (B)  Right atrium
• (C)  Left atrium
• (D)  Conus arteriosus

Answer

Submitted By :Ali Uppal

According to cohesion-tension theory, tension is created by__________________?

• (A)  Hydrogen bonding
• (B)  Transpiration
• (C)  Adhesion
• (D)  Root prerssure

Answer

Submitted By :Ali Uppal

Cuticular transpiration is _____________ of total transpiration?

• (A)  1-2%
• (B)  3-4%
• (C)  5-7%
• (D)  90%

Answer

Submitted By :Ali Uppal

An infectious disorder of respiratory system is_________________?

• (A)  Cancer
• (B)  Asthma
• (C)  Tuberculosis
• (D)  Emphysema

Answer

Submitted By :Ali Uppal

_________________ cells of phloem are directly involved in transport of organic solutes?

• (A)  Parenchyma
• (B)  Companion cell
• (C)  Tracheid
• (D)  Sieve element

Answer

Submitted By :Ali Uppal

95% of the cytoplasm of RBCs is____________?

• (A)  Hemoglobin
• (B)  Enzymes
• (C)  Salts
• (D)  Other proteins

Answer

Submitted By :Ali Uppal

Production of genetically identical copies of organisms/cells by asexual reproduction is called__________?

• (A)  Mitosis
• (B)  Replication
• (C)  Cloning
• (D)  Biological control

Answer

Submitted By :Ali Uppal

An antibody is made of _________ polypeptide chains?

• (A)  1
• (B)  2
• (C)  3
• (D)  4

Answer

Submitted By :Ali Uppal

______________ of earth surface is covered with water?

• (A)  10%
• (B)  30%
• (C)  75%
• (D)  90%

Answer

Submitted By :Ali Uppal

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

Answer

Submitted By :Ali Uppal