C. Fill in the blanks:
1____. observed the cell for the first time in 1660
. 2. Individuals formed from the bulges are known as ___
3___controls the changes which occur at adolescence
. 4. The strength of a force is usually expressed by its.___
5. Friction is caused by the____, on the two surfaces in contact.
Answers
1. Robert Hooke
2. Daughter Cells
3. Hormones
4. Magnitude
5. Interlocking of irregularities present
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Answer:
1) Robert Hooke
Initially discovered by Robert Hooke in 1665, the cell has a rich and interesting history that has ultimately given way to many of today's scientific advancements
2) Hydra is a freshwater organism. It reproduces by the method of asexual reproduction. In this process, a small outgrowth called bud is formed on the side of its body by the repeated division of its cells. This bulge elongates and develops a circlet of tentacles at its free end in the midst of which a mouth is perforated. It finally detaches itself from the body of parent. This type of reproduction is known as budding.
3) The changes which occur at adolescence are controlled by hormones. Hormones are chemical substances. These are secretions from endocrine glands, or endocrine system. The male hormone or testosterone begins to be released by the testes at the onset of puberty
4) magnitude
The strength of the force is expressed by its magnitude. The magnitude of force is represented in the SI unit of force called newton.
5) Friction is caused by interlocking of irregularities present on the surfaces in contact. Rough surfaces have larger irregularities while smoother surfaces have lesser irregularities. Hence, rough surfaces offer more friction as compared to smooth surfaces.