NEET Biology Plant Growth And Movement Chapter Notes

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Plant Kingdom Notes Full Course Plant Kingdom

 

 Growth is a process in which there is increase in the size by cell division and enlargement accompanied by the formation of new cellular material. It results in the irreversible increase in size, length area or volume accompanied by
increase in dry weight. In living beings, growth is internal or intrinsic in contrast to extrinsic growth observed in some non-living objects. Irreversible increase in size, mass or volume of living beings is an external manifestation of growth.
Further growth is a quantitative phenomenon which can be measured in relation to time.
 Development can be defined as a process in which there is a sequence of qualitative changes, towards a higher or more complex state. It includes all the changes an organism undergoes from the time of birth till death. In development plant shows a regular sequence of seed germination, growth, differentiation, maturation, seed formation and senescence.
 
CHARACTERISTICS OF GROWTH
 
 Primary growth is formation of primary permanent tissues and organs. It is caused by activity of apical and intercalary meristems.
 Secondary growth is increase in girth. It occurs by two types of lateral meristems, vascular cambium and cork cambium.
 Unlimited growth is growth that continues throughout life as it occurs in case of root and stem. Limited growth is that growth which stops after some time, e.g. leaves, flowers, fruits
 In higher plants the growth involves three steps or phases
- Phase of cell division
- Phase of cell enlargement
- Phase of cell maturation
 
NEET Biology Plant Growth and Movement Chapter Notes
 
GROWTH RATES
 
The expression of increased growth per unit time is called growth rate.
 
Growth rate shows two types of increase
 
 Arithmeticgrowth : It is a type of growth in which the rate of growth is constant and increase in growth occurs in arithmetic progression 2,4,6,8 etc. Here after mitosis, only one daughter cell continuous to divide. Other take part in differentiation and maturation i.e. root elongating at constant rate. Here a linear curve is obtained with value
Lt = Lo + rt
Lt : Length at time t
Lo = Length at time ‘zero’
R : growth rate
 Geometric growth: It is quite common in unicellular organisms when growth in nutrient rich medium. Here every cell divides. The daughter grow and divide. The granddaughter repeat the process and so on. Number of cells is initially
small so that initial growth is slow. Later on, there is rapid growth at exponential rate. An embryo log or exponential growth. An embryo initially shows geometrical growth in cells, but later it passes into arithmetic phase 
NEET Biology Plant Growth and Movement Chapter Notes-1
 
GROWTH CURVE
 
• The exponential growth curve can be represented by equation
Wt = Woert
 
Wt : Final size
Wo : Initial size at beginning of the time period
r : growth rate
t : time of growth
 
 
 V.H. Blackman (1919) suggested ‘r’ might be used as a measure of the ability of a plant to produce new plant material and called it efficiency index
 
 The rate of growth is not uniform for a cell, organ or an organism. If the growth rates of a plant are plotted against time on a paper, a sigmoid growth curve or S-shaped growth curve is obtained. It consists of lag phase or slow phase, log
phase or exponential growth phase, rate becomes more rapid and senescence phase or declining phase. A steady phase or stationary phase(limited growth) occurs at the end.
 
NEET Biology Plant Growth and Movement Chapter Notes-2
 
MEASUREMENT OF GROWTH
 
¶ Growth is measured with the help of auxometer, horizontal microscope and crescograph ( developed by Sir J.C.Bose)
¶  Growth can be measured by measuring increase in weight area and volume in fresh and dry form. In yeast and bacteria, increase in length, number of cells can be taken into account.
¶  In arc auxometer, when growth occurs, stem increases in length. Due to pressure of weight wheel rotates gradually. This leads to movement of indicator on arc scale. This reading on graduated arc provides information about the rate of growth.
 
FACTOR INFLUENCING GROWTH AND DEVELOPMENT
 
1. LIGHT
 
It controls photosynthesis, transpiration, pigment formation, tissue differentiation seed germination, etc. Ultraviolet ray are inhibitory. They induce rosette formation. Red light promotes growth but plant organs are soft. Blue light produce normal slightly less growth. Low light intensity increases intermodal length and leaf size. High light intensity decreases their size but allows more Certain seed germinate only in the presence of light, eg. Viscumalba. Seeds of lettuce and tobacco require red light for their germination. Certain other seeds e.g. onion cannot grow in the presence of light. Light induces tissue differentiation in plants. Light induced tissue differentiation is called photo-morphogenesis. It involves photoreceptor pigment system called phytochrome. This can be observed by growing seedlings in dark. The seedlings are pale and weak. The phenomenon is etiolation and seedlings known as etiolated seedlings.
Etiolated seedlings have:
(i) Pale colour
(ii) Long internodes
(iii) Subterminal hook
(iv) Small pale leaver
(v) No mechanical tissue
(vi) Small and few roots
 
2. TEMPERATURE
 
Minimum, optimum and maximum temperature for plant growth are 2O -5O C. 20O -30O C., 40O -50OC. Lower temperature inactivates enzymes. It increase density of protoplasm. There is little absorption of water from soil. Internal
water can be frozen. Chilling and freezing injury may occur. Cold storage or refrigerator is due to inhibition of growth of plant organs, reduced metabolic activity influences seed germination, growth and seasonal development of plants. Some plants require low temperature treatment for their growth and flowering. The phenomenon is called vernalisation.
High temperature of 45OC and above reduces growth due to excessive transpiration, denaturation of enzymes and coagulation of protoplasm. Its effect is externally visible as leaf scorch, heat canker and desiccation.
 
3. WATER
 
Optimum hydration is essential for cell elongation, cell turgidity and functioning of metabolic machinery. Growth is reduced even in slight deficiency of water. It however, promotes differentiation. Water stress completely stops growth.
 
4. OXYGEN
 
It is required for release of energy during respiration. Energy is needed for anabolic activities of growth
 
5. SOIL
 
It provides minerals, some growth stimulants and water
 
6. CARBON DIOXIDE
 
Essential for photosynthesis and hence nutrition. However, in higher concentration carbon dioxide inhibits growth
 
7. HERIDITARY POTENTIALITY
 
Growth and differentiation is genetically determined
 
8. GRAVITY
 
It determines the direction of root and shoot growth.
 
9. STRESS
 
Stress factors like excess or deficiency of salts, low or high temperature, excess and deficiency of water have a detrimental effect on growth.
 
10. NUTRITION
 
It provides raw material for growth and differentiation as well as source of energy.
 
11. GROWTH REGULATORS
 
DIFFERENTIATION, DEDIFFERENTIATION, REDIFFERENTIATION
 
 Differentiation: It is the permanent qualitative changes in structure, chemistry and physiology of cell wall and protoplasm of cells, their tissues and organs. It is caused by repression of some genes.
 Dedifferentiation: It is the process of despecialisation of differentiated living cells so that they regain the capacity to divide and for new cells. A dedifferentiated tissue can act as meristem e.g.interfasicular vascular cambium, cork cambium, wound cambium. In culture experiments, parenchyma cells dedifferentiate to produce a mass of dividing cells called callus.
 Redifferentiation : Structural, chemical and physiological specialization of cells derived from dedifferentiation. It is similar to differentiation of cells and tissues formed by primary meristems. Secondary phloem, secondary xylem, cork,
secondary cortex are some of the tissues formed through redifferentiation.
 
PHOTOPERIODISM
 
 Photoperiodism is the effect of duration of light and darkness on the growth, development and behavior of organisms. It is especially connected with flowering of plants, formation of underground storage organs, leaf fall etc. the effect of photoperiods on flowering was discovered by Garner and Allard ( 1920)incase of maryland of mammoth variety of Tobacco on the basis of their response to photoperiods.
 
Plants are of the following types
 
1. Long Day plants (LDP)
Plants flowers after receiving light above a critical length e.g. wheat oat, sugarbeet, spinach, radish, lettuce, poppy.
2. Short Day Plants (SDP)
Plants flower only when they receive light below a critical length e.g. tobacco, potato, Xanthium, rice, dahlia, chrysanthemum, soya bean
3. Day Neutral Plants (DNP)
Photoperiods have no impact on these plants which come to flower after completing their vegetative growth e.g. tomato, maize, cotton, sunflower, cucumber
4. Short-long Day Plants (SLDP) 
Short photoperiod for initiation of lower and long photoperiods for blossoming e.g. Campanula medium, Trifoliumrepens.
5. Long-short Day Plants ( LSDP)
Long photoperiods for initiation of flowering and short photo photoperiod for blossoming e.g. Bryophyllum, cestrum
 
• Day Neutral Plants are more common in tropical areas. They can be made to flower throughout year. In subtropical and temperate areas short day plants flower during autumn and spring while long day plants flower during summer.
•  Critical day length is that continuous duration of light which must always be exceed in short day light.
•  Critical dark period is that continuous duration of darkness. Long day plants do not require any continuous dark period. They are, therefore, called short night plants (SNP). Short day plants are known as long night plants (LNO)
•  The phenomenon of perceiving appropriate light periods and obtaining the stimulus of flowering is known as phot photoperiodic induction. Photoperiodic induction requires
(i) A minimum vegetative growth
(ii) A minimum number of appropriate photoperiod
(iii) Photoreceptor pigment called phytochrome
 
NEET Biology Plant Growth and Movement Chapter Notes-3
 
(iv) Fully developed leaves which receive the stimulus of light
 
VERNALISATION
 
 Vernalisation means ability of low temperature treatment to convert cereal into spring cereal
 Site of vernalisation is apical meristem or all the meistematic cells. E.g. shoot, tip, embryo tips, root apex
 As a result of vernalization, a flowering hormone called vernaline is formed but vernaline has never been isolated.
 Once a plant is vernalized, it can be devernalized by exposing the plant to temperature of 30OC or above. For establishing vernalization, plant should be kept at 20OC for 4-5 days
 
CONDITIONS NECESSARY FOR VERNALISATION
 
 Temperature : 1 – 6OC is the optimum temperature
 Duration : 1 to 1.5 months low temperature treatment is necessary
 Oxygen : As vernalisation is aerobic process, so it requires O2
 Water : Proper hydration is necessary
 
IMORTANCE OF VERNALISATION
 
 Crop can be grown earlier
 Plants can be grown in such regions where normally they do not grow
 Yield of the plant is increased
 Resistance to cold and frost is increased
 Resistance to fungal disease
 
SENESCENCE
 
It is the process of ageing which is caused by increased entropy, cellular breakdown, reduced homeostasis, increased metabolic failure and errors of replication as well as transcription
1. Whole plant senescence
Monocarpic plants begin to undergo senescence along with fruit ripening. Eg. Bamboos and sago palm
2. Shoot senescence
Certain perennial herbs produce annual aerial shoots for photosynthesis, bearing of flowers and fruits. With maturity of fruits, the aerial shoot undergo senescence underground parts perennate. Eg. Ginger, Narcissus, banana
3. Sequential / progressive senescence
Polycarpic evergreen perennial plants show progressive senescence of older leaves, lateral organs and branches, flower, fruit bearing shoots as new growth occurs near the tip eg. Mango, eucalyptus
4. Simultaneous/ Synchronous leaf senescence.
In perennial polycarpic deciduous plant all the leaves undergo senescence and are shed simultaneously in a particular season, commonly autumn E.g. Elm, maple, mulberry
 
GROWTH REGULATORS
 
(a) Characteristics
 Plant growth regulators are small, simple molecules secreted in minute quantities that influence various physiological functions in plants. They are of diverse chemical composition, as given below
(i) Indole compounds : Indole-3-acetic acid (IAA)
(ii) Adenine derivatives : Kinetin, N6 – furfuryl amino purine
(iii) Derivatives of carotenoids : Abscisic acid ( ABA)
(iv) Gases : Ethylene
(b) Classification
¶ Plant growth regulators are grouped into two categories based on the nature of their action
(i) Plant growth promoters e.g. Auxins, cytokinins, Gibberellins
They promotes growth activities like cell division, cell enlargement, flowering, fruiting and seed formation, tropic growth movement etc.
 
(ii) Plant growth inhibitors e.g. Abscisic acid
They play an important role in plant response to wounds and stress of biotic and a biotic origin They are involved in growth inhibiting activities such as dormancy, abscission etc.
 
AUXIN
 
(a) Discovery
 Charles Darwin and his son Francis Darwin observe that the coleoptiles of canary grass responded to unilateral illumination by growing towards the light source ( phototropic curve)
 After a series of experiments, it was concluded that tip of the coleoptiles is the site of production of a substance, that caused the bending of coleoptiles.
 F.W. Went isolated auxin from the tips of coleoptiles of oat seedlings
 
(b) Isolation
 The word auxin is derived from Greek word ‘auxein’ meaning to grow
 It was first isolated from human urine
 Indole-3-acetic acid (IAA) and Indole butyric acid have been isolated from plants
 Naphthalene acetic acid (NAA) and 2,4 dichlorophenoxy acetic acid (2,4-D) are synthetic auxins
 
(c) Physiological effects
 Auxins control growth of plant cells.
 They also control cell division in vascular cambium and xylem differentiation
 They are responsible for apical dominance in plants
¶ They prevent the formation of abscission layer and there by prevent premature fall of leaves, flowers, fruit etc
 
(d) Application / Use
 Auxin are used to initiate rooting in stem cuttings.
 They are used to induce parthenocarpic fruits in tomatoes.
 2, 4 D is used as a weedicide/ herbicide to kill dicotyledonous weeds
 They promote flowering in pineapples and litchi
 Auxins are used to prevent the premature fall of leaves, flowers, fruits etc
 
GIBBERELLINS
 
(a) Discovery
 The ‘Bakan’ ( foolish seedlings) disease in rice seedling was caused by a fungus Gibberellafujikuroi
 EE. Kurosawa found that the symptoms of the disease could be developed in uninfected seedling by treating them with sterile filtrate of the fungus
 The active principle was later identified to the gibberellin acid.
 
(b) Isolation
 There are more than hundred gibberellins reported from various higher plants and fungi.
 They are denoted as GA1, GA2, GA3 and so on
 GA3 is the most intensively studied form of GAS
 
(c) Physiological effects
 They cause elongation of the internodes
 They promote bolting in rosette plants like cabbage, beet root etc
 GA3 initiates synthesis of hydrolases to digest and mobilize the reserve food materials of the seed to the developing embryo and thus it breaks seed dormancy
 
(d) Applications/ Uses
 Gibberellins are used to increase the length of grape stalks
 They causes the fruits like apple to elongate and improve shape
 They delay senescence and hence the fruits can be left on the trees for longer period; this increases/ extend the market period
 GA3 is used to speed up malting process in brewing industry
 By increasing the length of internodes in sugarcane, GA3 increases the yield of sugar cane by about 20 tonnes/acre.
 Spraying juvenile conifers with GA3 hastens their maturity and leads to early seed production.
 
CYTOKININS
 
(a) Discovery
 Skoog and his co-workers observed that tobacco callus could proliferate only if the medium contains in addition to auxin, the extracts from yeast, coconut milk or DNA.
 Skoog and miller later identified and crystallized the cytokinesis – promoting substance and called it kinetin
 
(b) Isolation
 Cytokinins were discovered as kinetic from the autoclaved herring sperm DNA.
¶ Kinetin does not occur naturally in plants and search for natural substances with cytokinin – like activities led to the isolation of zeatin from corn-kernels and later a cytokinin from coconut milk
 Later several naturally –occuringcytokinins and synthetic compounds with cell division – promoting activity have been identified.
 Natural cytokinins are synthesized in plants in regions where rapid cell division occurs e.g. root apices, shoot buds, young fruits etc
 
(c) Physiological effects
 Cytokinins help in the growth of lateral buds into branches and help to overcome apical dominance
 They also promote adventitious shoot formation as they help to produce new leaves and chloroplasts in leaves
 They promote nutrient mobilization and help to delay senescence
 
(d) Applications
 They are used to make the lateral buds grow into branches
 They are used to delay leaf senescence
 
ABSCISIC ACID (ABA)
 
(a) Discovery
 There independent researchers reported three kinds of growth inhibitors:
(i) Inhibitor – B
(ii) Abscisin II
(iii) Dormin
 Later all of them were found to be chemically similar and named abscisic acid
 
(b) Isolation
 It was discovered from its role in regulating abscission and dormancy
 
(c) Physiological effects
 It plays an important role in seed development and inducing seed dormancy, by this it helps the seed to withstand desiccation and other unfavourable factors.
 It stimulates the closure of stomata under conditions of intense solar radiation and water stress
 It increases tolerance of plants to various stress and hence called as stress hormone
 ABA stimulates the formation of abscission layer and abscission of leaves flowers and fruits
 
(d) Application
 Seeds are treated with ABA to remain dormant during storage 
 
ETHYLENE
 
(a) Discovery
Cousins confirmed that ripened organs released a volatile substance that fastened the ripening of the stored banana ; later this volatile substance was identified as ethylene
 
(b) Isolation
 Ethylene is synthesized in large quantities by the tissues of ripening fruits and senescing organs
 
(c) Physiological effect
 It promotes horizontal growth of seedlings and swelling on the axis.
 It induces apical kook formation (called epinasty) in dicot seedlings
 It promotes senescence and abscission of leaves and flowers
 It promotes root growth and root hair formation, thereby increasing the absorptive area.
 It promotes rapid elongation of internodes and petioles of deep water rice plants and helps the leaves to be above water level
(d) Applications
 Ethephon is the compound used to supply ethylene, it is an aqueous solution that is readily absorbed and transported within the plant and it releases ethylene slowly.
 It hastens fruit ripening in tomatoes and apple
 It promotes the production of female flowers on a monoecious plant
 It accelerates abscission of flower and fruits in cotton, cherry, walnut etc
 It is used to initiate flowering and for synchronizing fruit set in pineapples
 It breaks seed and bud dormancy and initiates germination in peanut seeds and sprouting of potato tubers
 
PLANT MOVEMENT
 
Plants have the capacity of changing their position in response to external ( environment) or internal stimuli, which are known as plant movement.
The specific region or site where the stimulus is received for changing the position called perception site or region. The minimum period for which stimulus should be given for inducing plant movement is called presentation time Summary of movement flow chart on next page 
 
NEET Biology Plant Growth and Movement Chapter Notes-4
NEET Biology Plant Growth and Movement Chapter Notes-5
 
 
Reproduction in Flowering Plants
NEET Botany Reproductive Morphology Chapter Notes

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