Ozone depletion occurs commonly due to_______________?
Ozone depletion occurs commonly due to_______________?
A. Carbon dioxide
B. Chlorofluorocarbons
C. UV rays
D. Deforestation
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Notochord is present throughout life in___________?
Notochord is present throughout life in___________?
A. Urochordates
B. Cephalochordates
C. Chordates
D. VertebratesWhich one of the following is avascular structure?
Which one of the following is avascular structure?
A. A compact bone.
B. A spongy bone.
C. Cartilage
D. All of theseBacteria protect themselves from viruses by fragmenting viral DNA with ____________?
Bacteria protect themselves from viruses by fragmenting viral DNA with ____________?A. Ligase
B. Endonuclease
C. Exonuclease
D. GyraseSteroids, a biologically active organic compound, are derived from __________?
Steroids, a biologically active organic compound, are derived from __________?A. Hormones
B. Chemicals
C. Cholesterol
D. CarbohydratesAll of the following coelenterates show alternation of generation except:
All of the following coelenterates show alternation of generation except:
A. Hydra
B. Obelia
C. Aurelia
D. None of theseWhich of the following ions are involved in the initiation of nerve impulse_______________?
Which of the following ions are involved in the initiation of nerve impulse_______________?
A. Na+
B. K+
C. Fe
D. none of these