2021. The ratio of WBC and RBC is :
A. 1:60
B. 1:600 *
C. 1:6000
D. 1:60000
2022. During blood coagulation, thromboplastin is released by :
A. RBC
B. Blood Plasma
C. Leucocytes
D. Clumped platelets and damaged tissues *
2023. The life span of WBC is approximately :
A. Less than 10 days
B. Between 20-30- days *
C. Between 2-3 Months
D. More than three months
2024. Which of the following is only present in animal cells but is present in plant cells?
A. Cell wall *
B. Vacuole
C. Mitochondria
D. Reticulum
2025. What is the most important stimulant in tea leaves ?
A. Brucine
B. Caffeine *
C. Phenylalanine
D. Theine
2026. A large number of identical plants can be obtiained ina short span of time through :
A. Tissue culture technique *
B. Hydroponics method
C. Stem cuttings
D. Larege number of seeds of a single plant
2027. Which of the following food items is rich in iron ?
A. Apple *
B. Rice
C. Orange
D. Pulses
2028. What rays of sunlight are mostly utilized by chlorophyll in photsynthesis ?
A. Red *
B. Yellow
C. Green
D. Blue
2029. Opium is obtained from which part of the poppy plant ?
A. Unripe fruits *
B. Flower
C. Leaves
D. Roots
2030. Which of the following is not a fruit ?
A. Mustard *
B. Orange
C. Pear
D. Apple