Thorns,spines and prickles are

  • A
    Organs of defence
  • B
    Organs of offence
  • C
    Organs of clinging
  • D
    Specialised for gaseous exchange

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Which one of the following figures represents the placentation in Dianthus?

Match the following columns:
Column-$I$ (Common Name)Column-$II$ (Scientific Name)
$A$. Hibiscus$i$. Bougainvillea spectabilis
$B$. Lemon$ii$. Allium cepa
$C$. Sunflower$iii$. Hibiscus rosa-sinensis
$D$. Bougainvillea$iv$. Citrus limon
$E$. Onion$v$. Helianthus annuus
-$vi$. Rosa indica

Units of............ are united or free.

How would you distinguish monocots from dicots?

According to the classification system of Bentham and Hooker,what is the total number of families of seed-bearing plants (Phanerogams)?

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