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Magazine Problem 147
Assertion: All locomotions are movements but all movements are not locomotion. Reason: Movement is one of the significant features of living beings.
Problem 149
Assertion: Arthritis or inflammation of a joint makes the joint painful. Reason: Some toxic substances are deposited at the joint.
Problem 151
Assertion: There are similarities between the locomotion of unicellular organisms and multicellular animal. Reason: Ciliary, flagellar and amoeboid movement occur in unicellular organisms.
Problem 152
Assertion: White muscle fibres have very less quantity of myoglobin. Reason: White muscle fibres have high number of sarcoplasmic reticulum.
Problem 157
Assertion: Muscle as a whole doesn't obey all or none law. Reason: Each muscle fibre contracts maximally whenever it contracts.
Problem 158
Assertion: Amoeba shows simple form of movement Reason: Streaming of protoplasm is found in amoeba
Problem 161
Assertion: We can remove dust particle and some foreign substances inhaled along with the atmospheric air from trachea Reason: Trachea is lined with ciliated epithelium
Problem 162
Assertion: \(\mathrm{Ca}^{2+}\) ion plays important role in muscle contraction Reason: Calcium ion binds to subunit of troponin on actin filament and removes the masking of active sites for myosin
Problem 163
Assertion: Skeletal muscle fibre is a syncitium. Reason: Sarcoplasm of skeletal muscle fibre contain many nuclei.
Problem 164
Assertion: Skeletal muscles are striated muscles Reason: They have striped appearance under the microscope
