all tissue types possess a unique stem cell niche, and despite many differences among the niche architecture of different tissues, several common principles of stem cell regulation can be applied to all environments. These principles involve extracellular mechanisms leading to intracellular changes that regulate stem cell behavior.

Column A	Column B
I. Extracellular regulatory mechanisms	i. Regulation by endocrine, paracrine, or juxtacrine mechanisms
II. Intracellular regulatory mechanisms	ii. Regulation by a network of transcription factors
	iii. Epigenetic regulation
	iv. Regulation by cell-to-cell and cell-to-matrix adhesions
	v. Regulation by cytoplasmic determinants

Match the following regulatory mechanism (column A) with the factors that regulate stem cell behavior (column B).

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#Question id: 15874

#Unit 12. Applied Biology

Callus culture show numerical chromosomal changes such as;

TLS Online TPP Program

#Question id: 15875

#Unit 12. Applied Biology

Suspension cultures show both numerical and structural chromosomal changes such as;

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#Question id: 15876

#Unit 12. Applied Biology

The following growth regulators (GRs)- auxins, cytokinins, ABA and GA3 are used in plant tissue culture, The common range of concentrations used are as follows:

GROWTH REGULATOR(GRs)                                     CONCENTERATION

A) AUXIN                                                                       i) 0.1-3 mg/L

B) GA3                                                                          ii) 0.2 mg/L

C) CYTOKININ                                                           iii) 0.1-1 mg/L

D) ABA

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#Question id: 15877

#Unit 12. Applied Biology

Zinc as micronutrient is used in culture media for____

TLS Online TPP Program

#Question id: 15878

#Unit 12. Applied Biology

A vitamin which has been found to inhibit callus formation and improve growth and quality of shoots.

TLS Online TPP Program

#Question id: 15879

#Unit 12. Applied Biology

During which Phase lasts about 3-4 cell generations (the time taken for doubling of cell number), and the duration of a cell generation may vary from 22-48 hr, depending mainly on the plant species?