Q. Heterocysts, specialised for nitrogen fixation, occur in certain
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Q. Clove, the commonly-used spice, is obtained from the
Q. Whorl of small green structures present around the sunflower is
Q. Crude oil is sometimes termed sweet because it is :
Q. Which of the following factors contributes to the carbon cycle?
Q. If the length of a simple pendulum is halved then its period of oscillation is
Q. The elastic vessels which transport blood to the heart is known as
Q. A group of genes whose activity is coordinated by a DNA site is called:
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