Read the different components from (i) to (iv) in the list given below and tell the correct order of the components with reference to their arrangement from the outer side to the inner side in a woody dicot stem. (i) Secondary cortex (ii) Wood (iii) Secondary phloem (iv) Phellem
Correct answer: A. (iv), (i), (iii), (ii)
- A. (iv), (i), (iii), (ii)
- B. (iv), (iii), (i), (ii)
- C. (iii), (iv), (ii), (i)
- D. (i), (ii), (iv), (iii)
Explanation
(a): In a woody dicot stem, phellem (cork) forms the outermost layer followed by phellogen and then secondary cortex (phelloderm). The secondary phloem forms a narrow circle on the outer side of the vascular cambium whereas the secondary xylem occurs on the inner side of vascular cambium.
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About Support and Movement
Support and movement covers the axial and appendicular skeleton, bone structure, joints and the arrangement of skeletal muscles. Muscle contraction is explained through actin, myosin, sliding filaments, calcium ions and ATP, while arthritis is distinguished as a disorder of joints rather than a normal part of movement.
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