621. Most weather phenomena take place in the troposphere.
622. The matter of our sun is in a plasma state.
623. Silicon is an example of a semiconductor.
624. The blind spot is located at the optic disc of the eye.
625. Guava has the maximum amount of vitamin C.
626. Short-sightedness can be corrected by using a concave lens.
627. Wisdom teeth normally grow between the age of 17-30.
628. The flower called “Queen of Water” is the Lily.
629. The fan was invented by Schuyler Skaats Wheeler.
630. Osmosis is the movement of any solvent across a semipermeable membrane.
631. Gastric juice has the lowest pH.
632. Potential difference is the work done in moving a unit charge between two points in an electric circuit.
633. A crescograph is a device for measuring the growth in plants.
634. Boron is a micronutrient for plants.
635. The cover of the capsule is made of gelatin.
636. Isotopes of an element have the same number of neutrons.
637. The White bellbird is the world’s loudest bird.
638. A convex mirror always forms a virtual image.
639. Anthropology is the study of the structure of the body.
640. Bacteriologist Leonard Thompson discovered insulin.

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