Class X Chapter 8 – How do Organisms Reproduce Science
Simple organisms such as Hydra and Planaria are capable of producing new individuals through the process of regeneration . The process of regeneration involves the formation of new organisms from its body parts . Simple organisms can utilize this method of reproduction as their entire body is made of similar kind of cells in which any part of their body can be formed by growth and development . However , complex organisms have organ-system level of organization . All the organ systems of their body work together as an interconnected unit . They can regenerate their lost body parts such as skin , muscles , blood , etc . However , they cannot give rise to new individuals through regeneration . Question 4 : Which of the following is a plant hormone ? ( a ) Insulin ( b ) Thyroxin ( c ) Oestrogen ( d ) Cytokinin Answer : ( d ) Cytokinin is a plant hormone . Question 5 : Why is DNA copying an essential part of the process of reproduction ? Answer : DNA ( Deoxyribonucleic acid ) copying is an essential part of reproduction as it passes genetic information from parents to offspring . It determines the body design of an individual . The reproducing cells produce a copy of their DNA through some chemical reactions and result in two copies of DNA . The copying of DNA always takes place along with the creation of additional cellular structure . This process is then followed by division of a cell to form two cells .
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