Why do internodal segments of sugarcane fail to propagate vegetat

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 Multiple Choice QuestionsShort Answer Type

41. Name the three phases in the life span of an organism.
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42. Why do internodal segments of sugarcane fail to propagate vegetatively even when they are in contact with damp soil ?


Sugarcane plants propagate vegetatively only when nodes are in contact with damp soil and not from the internodes. Adventitious roots emerge from nodes, so even if the internodes are in contact with the damp soil the plant fails to propagate.
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 Multiple Choice QuestionsLong Answer Type

43. Define
(i) Juvenile phase
(ii) Reproductive phase
(iii) Senescent phase.
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 Multiple Choice QuestionsShort Answer Type

44. Explain the process of budding in yeast.
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45. Differentiate between a zoospore and a zygote.
                       Or

What is zoospore ?

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46. How does Bryophyllum plant propagate?
                                Or

Why do the new plants grow on Bryophyllum leaf ?

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 Multiple Choice QuestionsLong Answer Type

47.  Define external fertilization. Mention its disadvantages.
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48. Higher organisms have resorted to sexual reproduction inspite of its complexity. Why ?
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 Multiple Choice QuestionsShort Answer Type

49. What is a bisexual flower ? Collect five bisexual flowers from your neighbourhood and with the help of your teacher find out their common and scientific names.
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50. What are oviparous and viviparous animals ? Give one example of each.
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