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Answer» (a) Actin and Myosin Actin | Myosin | 1 | Actin is a thin contractile protein. | 1 | Myosin is a thick contractile protein. | 2. | It is present in light bands and is called an isotropic band. | 2 | It is present in dark bands and is called an anisotropic band. |
Actin | Myosin | 1 | Actin is a thin contractile protein. | 1 | Myosin is a thick contractile protein. | 2. | It is present in light bands and is called an isotropic band. | 2 | It is present in dark bands and is called an anisotropic band. |
(b) Red and White muscles Red muscle fibre | White muscle fibre | 1 | Red muscle fibres are thin and smaller in size. | 1 | White muscle fibres are thick and larger in size. | 2 | They are red in colour as they contain large amounts of myoglobin. | 2 | They are white in colour as they contain small amounts of myoglobin | 3 | They contain numerous mitochondria. | 3 | They contain less number of mitochondria. | 4 | They carry out slow and sustained contractions for a long period. | 4 | They carry out fast work for short duration. | 5 | They provide energy by aerobic respiration. | 5 | They provide energy by anaerobic respiration. |
(c) Pectoral and Pelvic girdle Pectoral girdle | Pelvic girdle | 1 | It is a skeletal support from where the forelimbs of vertebrates are attached. | 1 | It is a skeletal support form where the hind limbs of vertebrates are attached. | 2 | It is composed of two Bones namely, clavicle or collar bones and scapula or shoulder bone. | 2 | It is composed of three bones, upper ileum, inner pubic, and ischium. |
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