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Pheromones are substances which are secreted to the outside by an individual and received by a second individual of the same species.
The unit of electric current is:
Which of the following gases in the atmosphere is/are responsible for acid rains?
1. Oxides of Sulphur
2. Oxides of nitrogen
Two layers of a cloth of equal thickness provide warmer covering than a single layer of cloth with double the thickness. Why?
What is the name of the outermost layer of the Earth?
Which of the following method can be employed to test the Hardness of Water?
In which of the following sphere, weather phenomenon occurs ?
When a monochromatic light of frequency less than the threshold frequency is incident on a metal surface, which of the following occurs?
What is the primary cause of tides on Earth?