Question

Match List - I with List - II during the process of androgenesis in plant.

Choose the correct answer from the options given below:

• A. A-I, B-II, C-IV, D-III
• B. A-II, B-IV, C-III, D-I
• C. A-III, B-IV, C-I, D-II
• D. A-IV, B-III, C-I, D-II

Hint:

Induction = Resetting (Dedifferentiate).
Segmentation = Dividing (Multicellular).
Regeneration = Emerging (Wall Bursting).

Answer 1

The Correct Option is C

Concept: The transition of a microspore into a plantlet (androgenesis) involves a sequence of physiological and morphological shifts.

Step 1: The Start: Induction and Segmentation.
Induction (A) is the initial phase where the vegetative or generative cells of the pollen are "shocked" into dedifferentiation (III). Once induced, the cell begins to divide. Segmentation (B) refers to these initial internal divisions that lead to the formation of a multicellular structure (IV) within the confines of the original pollen wall.

Step 2: Chromosomal and Physical Changes.
Diploidization (C) is a spontaneous or induced event where the haploid nuclei undergo nuclear fusion after the first androgenic division (I) (or later), resulting in a diploid state. This is crucial for the fertility of the final plant.

Step 3: Emergence: Regeneration.
Regeneration (D) is the final morphological step characterized by the bursting of the pollen wall (II). This allows the internal pro-embryo to emerge into the medium and continue its development through the standard stages of embryogenesis into a plantlet.