Question
Select the correct sequence of events for plant somatic embryogenesis :
A. Production of torpedo stage embryos
B. Initiation of embryogenic callus
C. Formation of globular embryos
D. Production of green cotyledonary stage embryos
Choose the correct answer from the options given below :
The correct answer is
B, C, A, D
Somatic Embryogenesis Sequence Breakdown
Plant somatic embryogenesis is a process where somatic cells develop into embryos, mimicking zygotic embryogenesis. Understanding the correct sequence is crucial for plant tissue culture applications.
The process follows these key stages:
- B. Initiation of embryogenic callus: This stage involves the dedifferentiation of mature somatic cells (like leaf or root cells) into actively dividing, totipotent cells forming an embryogenic callus.
- C. Formation of globular embryos: The embryogenic callus cells organize and differentiate to form early-stage, globular-shaped embryos.
- A. Production of torpedo stage embryos: The globular embryos elongate and develop the characteristic bipolar structure of the torpedo stage.
- D. Production of green cotyledonary stage embryos: The embryos further mature, developing cotyledons and a shoot apex. These often turn green due to chlorophyll development and are capable of germination.
Therefore, the correct sequence representing the progression of plant somatic embryogenesis is B → C → A → D.
This corresponds to Option 1.
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Important Questions from Miscellaneous
- Which of the following relationships is/are not true?
(A). Most probable velocity = $\sqrt{\frac{2RT}{M}}$
(B). PV = $\frac{3}{2}kT$
(C). Compressibility factor Z = $\frac{pV}{nRT}$
(D). Average kinetic energy of gas = $\frac{1}{2}kT$
Choose the correct answer from the options given below - Match List-I with List-II
List-I List-II Electronic Configuration First Ionisation energy (kJ mol$^{-1}$) (A). ns$^2$ (I). 2100 (B). ns$^2$np$^1$ (II). 1400 (C). ns$^2$np$^3$ (III). 800 (D). ns$^2$np$^6$ (IV). 900
Choose the correct answer from the options given below: - The shielding constant of a 2p electron (calculated using Slater's rules) is
- Match List-I with List-II
List-I List-II Spectroscopy Property (A). Raman (I). Polarizability (B). FTIR (II). Dipole Moment (C). UV-Visible (III). Absorbance (D). NMR (IV). Spin
Choose the correct answer from the options given below: - The structure of protein comprises of:
(A). Primary structure of protein is associated with amino acids
(B). Secondary structure of protein is associated to peptides
(C). Tertiary structure of protein is associated with polypeptide chains
(D). Quaternary structure of protein is associated with polypeptide chains
Choose the correct answer from the options given below:
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