Light – Reflection and Refraction — Science STD 10 — Question

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A plant’s response to light is called _________.

An element has atomic number 2, it belongs........ group.

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The union of a sperm nucleus with an egg nucleus is known as ________ and results in a _______ egg.

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The theory of natural selection for evolution was proposed by _____.

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To bring light from a distant object to a focus on the retina of the eye, the convex eye-lens needs to be made ____.

The addition of hydrogen to a substance is called __________ whereas removal of hydrogen is called __________.

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The horizontal rows in a periodic table are called ________.

The next higher homologue of ethanol is _________.

In case of a water molecule, hydrogen acquires a ______ configuration.

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The actual exchange of gases takes place in the _________ of the lungs.