4 Name two diseases caused by worms.
5 Name the components present in nucleus.
6 Name the two isotopes of Hydrogen
7 Mention any four phenomena that the universal law of gravitation was
able to explain.
8 The earth attracts an apple. Does the apple also attract the earth? If it
does, why does the earth not move towards the apple?
9 Distinguish between carriers and vectors.
10 The earth is acted upon by gravitation of sun, even though it does not
fall into the sun. Why?
Answers
Answer:
schistosomiasis, amebiasis are two diseases caused by worm
Answer:
4) ascariasis.
cestodiasis.
clonorchiasis.
echinococcosis
5) The nucleus is composed of various structures namely nuclear envelope, nucleoplasm or nucleus sap nuclear matrix, chromatin and nucleolus. The nuclear membrane forms an envelope like structure around the nuclear contents and is commonly known as a nuclear envelope.
6) Hydrogen has three naturally occurring isotopes: 1H (protium), 2H (deuterium), and 3H (tritium).
7) The force which binds us to the Earth. The revolution of the Moon around the Earth. The revolution of planets around the Sun. Tide arising due to the Moon and the Sun.
8) According to the third law of motion, the apple does attract the earth. ... The mass of an apple is negligibly small compared to that of the earth. So, we do not see the earth moving towards the apple.
9) Two carriers may produce children with the disease. Vectors: A disease vector is defined in epidemiology as an agent that carries and transmits an infectious pathogen into another living organism; vectors are organisms such as intermediate parasites or microbes.
10) The earth is acted upon by the gravitation of the Sun, even though it does not fall into the Sun. ... Sun provides enough centripetal force to keep the earth in its orbit and the earth provides centrifugal force due to its motion. These two forces balance each other which prevents the earth from falling into the sun.
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