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Morphology Of Flowering Plants

Question
CBSEENBI11002506
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Anatomically fairly old dicotyledonous root is distinguished from the dicotyledonous by 

  • the absence of secondary xylem

  • the absence of secondary phloem

  • the presence of cortex

  • the position of protoxylem

Solution

D.

the position of protoxylem

In dicotyledonous root, the condition of xylem is exarch as the protoxylem away from the centre and metaxylem onwards the centre. In dicotyledonous stem (eg, Cucubita), the condition of xylem is endarch as the metaxylem away from the centre and protoxylem towards the centre.

Some More Questions From Morphology of Flowering Plants Chapter

Define the following terms:

(c) actinomorphic

Define the following terms:

(d) zygomorphic

Define the following terms:
(e) superior ovary

Define the following terms:
perigynous flower

Define the following terms:
epipetalous stamen

Define the following terms:

(a) Racemose and cymose inflorescence

Define the following terms:
(b) Fibrous root and adventitious root

Define the following terms:
(c) Apocarpous and syncarpous ovary

Draw the labelled diagram of the following:
(i) Gram seed     (ii)    V.S. of maize seed

Describe modifications of stem with suitable examples.

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