The cork cambium, cork and secondary cortex are collectively called
Correct answer: C. Periderm
- A. Phelloderm
- B. Phellogen
- C. Periderm
- D. Phellem
Explanation
(c) : In hypodermis or outer cortical cells, a layer becomes meristematic which is known as cork cambium or phellogen. This phellogen also cuts off cells both on its outer side and inner side. The cells cut off on the outer side are phellem or cork cells and cells cut off on the inner side are phelloderms or secondary cortex. Phellem, phellogen, and phelloderm collectively constitute periderm. The function of the periderm is protective (because at maturity epidermis ruptures and hence the function is performed by the periderm).
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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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