Practice Pakistan's most useful MCQs for competitive exams

Conversion of ammonia or ammonium ion into nitrites during nitrogen cycle occurs due_____________?

• (A)  Rhizobium
• (B)  Nitrosomonas
• (C)  Nitrobacter
• (D)  Pseudomonas

Answer

Submitted By :Ali Uppal

Annual rainfall in grassland is about_____________?

• (A)  More than 2500 mm
• (B)  750-1500 mm
• (C)  250-750 mm
• (D)  Less than 250 mm

Answer

Submitted By :Ali Uppal

The first layer of cell wall which is formed is___________?

• (A)  Primary wall
• (B)  Secondary wall
• (C)  Middle lamella
• (D)  All of these

Answer

Submitted By :Ali Uppal

The productivity of aquatic ecosystem is basically determined by light and____________?

• (A)  CO2
• (B)  O2
• (C)  Water
• (D)  Nutrients

Answer

Submitted By :Ali Uppal

Ribosomes are assembled in__________?

• (A)  Nucleolus
• (B)  Nucleus
• (C)  DNA
• (D)  RNA

Answer

Submitted By :Ali Uppal

Which of the following hormone is polypeptide in nature____________?

• (A)  Insulin
• (B)  Thyroxine
• (C)  ADH
• (D)  Cortisone

Answer

Submitted By :Ali Uppal

Highest form of learning is__________________?

• (A)  Latent learning
• (B)  Insight learning
• (C)  Operant conditioning
• (D)  Instinct

Answer

Submitted By :Ali Uppal

The part of chloroplast where CO2 is fixed to manufacture sugar is__________?

• (A)  Stroma
• (B)  Grana
• (C)  Thylakoid
• (D)  Outer membrane

Answer

Submitted By :Ali Uppal

In human female, fertilization commonly occurs at______________?

• (A)  Proximal part of oviduct
• (B)  Distal part of oviduct
• (C)  Uterus
• (D)  Cervix

Answer

Submitted By :Ali Uppal

Of the following which one is not the characteristic of mitochondria?

• (A)  It contains F1 particles
• (B)  It is involved in the synthesis of protein
• (C)  It is a self replicating organelle
• (D)  Number of mitochondria is constant

Answer

Submitted By :Ali Uppal