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Question
Abnormal secondary growth is observed in
Abnormal secondary growth is observed in
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Solution
The correct option is A Dracaena
Anomalous or abnormal secondary growth in monocot Stem - In some members of plants such as Dracaena, Yucca, Agave, Aloe arboresence, Lomandra, Kingia, Sanseviera, etc., Vascular cambium is formed from the outer region of the ground tissues. Parenchyma formed towards the outside by the vascular cambium and secondary vascular bundles are formed toward the inner side.
In some plants, the girth of the stern increases without cambium, such as-Palm, Musa. Tulipa etc. The apical meristem of these plants is of special type. This is known as primary thickening meristem. This apical meristem is responsible for the growth in both length and girth (thickness) of the plant. So, abnormal secondary growth is observed in Dracaena and not in wheat, rice and ginger.
Therefore, the correct answer is option A.
Anomalous or abnormal secondary growth in monocot Stem - In some members of plants such as Dracaena, Yucca, Agave, Aloe arboresence, Lomandra, Kingia, Sanseviera, etc., Vascular cambium is formed from the outer region of the ground tissues. Parenchyma formed towards the outside by the vascular cambium and secondary vascular bundles are formed toward the inner side.
In some plants, the girth of the stern increases without cambium, such as-Palm, Musa. Tulipa etc. The apical meristem of these plants is of special type. This is known as primary thickening meristem. This apical meristem is responsible for the growth in both length and girth (thickness) of the plant. So, abnormal secondary growth is observed in Dracaena and not in wheat, rice and ginger.
Therefore, the correct answer is option A.
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