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Q. 6.
a. Lamina is a general anatomical term meaning "plate" or "layer". It is used in both gross anatomy and microscopic anatomy to describe structures. Some examples include: The laminae of the thyroid cartilage: two leaflike plates of cartilage that make up the walls of the structure.
b. A luminous body is one that emits its own light example- sun. Non luminous bodies are objects that reflect light from luminous bodies.
c. Electric current, any movement of electric charge carriers, such as subatomic charged particles (e.g., electrons having negative charge, protons having positive charge), ions (atoms that have lost or gained one or more electrons), or holes (electron deficiencies that may be thought of as positive particles).
d. an instrument for finding direction, with a needle that always points north
e. The North Pole is at the northernmost point of the Earth, while the South Pole is at the southernmost point on the Earth. The area around the North and South Poles is very cold but the area around the equator is very warm. North Pole.
Q. 7.
a. The primary functions of the stem are to support the leaves; to conduct water and minerals to the leaves, where they can be converted into usable products by photosynthesis; and to transport these products from the leaves to other parts of the plant, including the roots.
b. The image in a pinhole camera has the following characteristics: The image in a pinhole camera is inverted (upside down) as compared to the object. The image in a pinhole camera is real (because it can be formed on a screen). The image in a pinhole camera is of the same colour as the object.
c. An electrical switch is any device used to interrupt the flow of electrons in a circuit. Switches are essentially binary devices: they are either completely on (“closed”) or completely off (“open”). There are many different types of switches, and we will explore some of these types in this chapter. Electrical gadgets that have switches built into them are Fan, refrigerator, television, microwave oven, electric cookers.
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