Flashcards For NEET Biology - Plant Growth and Development

Flashcards for NEET Biology are designed to boost your NEET preparation. Find below flashcards for Plant Growth and Development. These flashcards on Plant Growth and Development are prepared as per the NEET syllabus. This is helpful for aspirants of NEET and other exams during last-minute revision. Flashcards For NEET Biology – Plant Growth and Development, covers all the important points that are frequently asked in the exam. Check BYJU’S for the full set of Flashcards and Study material for NEET Biology. Solve NEET Biology MCQs to check your understanding and outperform in the exam.

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Name of the NEET sub-section

Topic

Flashcards helpful for

Biology

Plant Growth and Development

NEET exams

 

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Plant Growth and Development

Primary growth

Apical meristem

Secondary growth

Lateral meristem

Meristematic phase

Cells are rich in protoplasm, large conspicuous nucleus, thin cellulosic cell wall, abundant plasmodesmatal connections

Elongation phase

New cell wall deposition, cell enlargement and increased vacuolation

Maturation phase

Maximal cell wall thickening and protoplasmic modifications

Arithmetic growth

Linear growth

E.g. root elongation

Geometrical growth

Sigmoid curve

E.g. Cell culture, tree showing seasonal activities

Differentiation

Cells mature to perform a specific function, e.g. apical meristem and cambium cells differentiate

Dedifferentiation

Regaining the capacity to divide after differentiation, e.g. parenchyma cells dedifferentiate to form interfascicular cambium, cork

Redifferentiation

Dedifferentiated cells again lose the capacity to divide and mature to perform specific functions, e.g. secondary xylem, phloem, etc.

Plasticity

Different kinds of plant structures in different phases of life or environmental conditions, e.g. heterophylly in larkspur and buttercup

Auxin

Indole compounds

Natural- IAA, IBA

Synthetic- NAA, 2,4-D

Isolated by F.W. Went from coleoptile of oat seedlings

First isolated from human urine

Produced by growing root and shoot apices

Auxin functions

Apical dominance

Root initiation in stem cuttings, xylem differentiation and cell division

Promotes flowering in pineapple, parthenocarpy in tomatoes

Cytokinins

Adenine derivatives

Natural- Zeatin

Synthetic- Kinetin

Skoog and Miller identified and crystallised for the first time

Natural source is yeast extract, DNA, coconut milk

Cytokinin functions

Promotes lateral and adventitious shoot growth

Delay of leaf senescence

Chloroplast formation

Gibberellins

Terpenes

E. Kurosawa identified and discovered gibberellic acid in rice seedlings infected by the fungus Gibberella fujikuroi causing foolish seedling disease

Gibberellin functions

Promotes stem elongation in sugarcane, grapes and elongation of fruits like apple

Early seed production in conifers

Bolting or internode elongation in beet, cabbage, etc.

Ethylene

Gaseous hormone

Reported by Cousins as a volatile substance in ripened oranges

Ethylene functions

Induces fruit ripening, increases respiration rate

Breaks seed and bud dormancy, initiates seed germination in peanuts and sprouting in potato tubers

Promotes senescence and abscission of flowers and leaves

Abscisic acid

Carotenoids

Plant growth inhibitor, stress hormone

E.g. inhibitor-B, abscission II and dormin

Antagonist to GAs

Abscisic acid functions

Regulates abscission and dormancy

Inhibits seed germination and stimulates stomatal closure

Help plant withstand desiccation and tolerate various stress conditions

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