The structure of D-arabinose is shown below. How many stereoisomers are possible for this molecule?

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#Question id: 37888

#Plant Biotechnology

Assertion (A): Tracheary element differentiation is considered an irreversible process. 

Reason (R): During differentiation, the cells lose their nuclei and cytoplasm, preventing dedifferentiation or redifferentiation.

Select the correct option:

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#Question id: 37889

#Plant Biotechnology

Consider the following statements regarding vascular differentiation:

1. Auxin is the principal limiting factor for vascular differentiation.

2. Gibberellic Acid (GA) is essential for the differentiation of phloem.

3. Lower levels of NH4+ and NO3- inhibit vascularization.

4. A high Cytokinin : Auxin ratio can promote both xylem and phloem differentiation.

Which of the statements given above are CORRECT?

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#Question id: 37890

#Plant Biotechnology

In which plant were the TED genes (TED2, TED3, TED4) identified as being expressed during the redifferentiation of mesophyll cells into tracheary elements?

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#Question id: 37891

#Plant Biotechnology

In the context of vascular tissue differentiation in vitro, which of the following sucrose concentrations is correctly matched with the type of tissue it predominantly induces? 

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#Question id: 37892

#Plant Biotechnology

Which of the following statements regarding the molecular basis of tracheary element differentiation is CORRECT? 

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#Question id: 37893

#Plant Biotechnology

Tracheary element differentiation is considered an irreversible process. What is the primary cytological reason for this?