Anatomy Of Flowering Plants An Introduction To Structure And Development Pdf
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Phytomorphology is the study of the physical form and external structure of plants. Recent studies in molecular biology started to investigate the molecular processes involved in determining the conservation and diversification of plant morphologies.
- CBSE Class 11 Biology Revision Notes Chapter 5 - Morphology of Flowering Plants
- Anatomy of Flowering Plants Notes for NEET, Download PDF!
- Anatomy of Flowering Plants: An Introduction to Structure and Development
- NCERT Solutions for Class 11 Biology Chapter 5
The most significant patterns, in terms of evolutionary relationships, involve reproductive structures, such as the number and arrangement of flower parts, or the structure of cones.
CBSE Class 11 Biology Revision Notes Chapter 5 - Morphology of Flowering Plants
Phytomorphology is the study of the physical form and external structure of plants. Recent studies in molecular biology started to investigate the molecular processes involved in determining the conservation and diversification of plant morphologies. In these studies transcriptome conservation patterns were found to mark crucial ontogenetic transitions during the plant life cycle which may result in evolutionary constraints limiting diversification.
Plant morphology "represents a study of the development, form, and structure of plants, and, by implication, an attempt to interpret these on the basis of similarity of plan and origin". First of all, morphology is comparative , meaning that the morphologist examines structures in many different plants of the same or different species, then draws comparisons and formulates ideas about similarities.
When structures in different species are believed to exist and develop as a result of common, inherited genetic pathways, those structures are termed homologous. For example, the leaves of pine , oak , and cabbage all look very different, but share certain basic structures and arrangement of parts.
The homology of leaves is an easy conclusion to make. The plant morphologist goes further, and discovers that the spines of cactus also share the same basic structure and development as leaves in other plants, and therefore cactus spines are homologous to leaves as well. This aspect of plant morphology overlaps with the study of plant evolution and paleobotany. Secondly, plant morphology observes both the vegetative somatic structures of plants, as well as the reproductive structures.
The vegetative structures of vascular plants includes the study of the shoot system, composed of stems and leaves , as well as the root system. The reproductive structures are more varied, and are usually specific to a particular group of plants, such as flowers and seeds , fern sori , and moss capsules. The detailed study of reproductive structures in plants led to the discovery of the alternation of generations found in all plants and most algae.
This area of plant morphology overlaps with the study of biodiversity and plant systematics. Thirdly, plant morphology studies plant structure at a range of scales. At the smallest scales are ultrastructure , the general structural features of cells visible only with the aid of an electron microscope , and cytology , the study of cells using optical microscopy.
At this scale, plant morphology overlaps with plant anatomy as a field of study. At the largest scale is the study of plant growth habit , the overall architecture of a plant.
The pattern of branching in a tree will vary from species to species, as will the appearance of a plant as a tree , herb , or grass. Fourthly, plant morphology examines the pattern of development , the process by which structures originate and mature as a plant grows. While animals produce all the body parts they will ever have from early in their life, plants constantly produce new tissues and structures throughout their life.
A living plant always has embryonic tissues. The way in which new structures mature as they are produced may be affected by the point in the plant's life when they begin to develop, as well as by the environment to which the structures are exposed. A morphologist studies this process, the causes, and its result. This area of plant morphology overlaps with plant physiology and ecology. A plant morphologist makes comparisons between structures in many different plants of the same or different species.
Making such comparisons between similar structures in different plants tackles the question of why the structures are similar. It is quite likely that similar underlying causes of genetics, physiology, or response to the environment have led to this similarity in appearance. The result of scientific investigation into these causes can lead to one of two insights into the underlying biology:. Understanding which characteristics and structures belong to each type is an important part of understanding plant evolution.
The evolutionary biologist relies on the plant morphologist to interpret structures, and in turn provides phylogenies of plant relationships that may lead to new morphological insights. For example, the leaves of pine, oak, and cabbage all look very different, but share certain basic structures and arrangement of parts. When structures in different species are believed to exist and develop as a result of common adaptive responses to environmental pressure, those structures are termed convergent.
For example, the fronds of Bryopsis plumosa and stems of Asparagus setaceus both have the same feathery branching appearance, even though one is an alga and one is a flowering plant.
The similarity in overall structure occurs independently as a result of convergence. The growth form of many cacti and species of Euphorbia is very similar, even though they belong to widely distant families. The similarity results from common solutions to the problem of surviving in a hot, dry environment. Plant morphology treats both the vegetative structures of plants, as well as the reproductive structures. The vegetative somatic structures of vascular plants include two major organ systems: 1 a shoot system , composed of stems and leaves , and 2 a root system.
These two systems are common to nearly all vascular plants, and provide a unifying theme for the study of plant morphology. By contrast, the reproductive structures are varied, and are usually specific to a particular group of plants. Structures such as flowers and fruits are only found in the angiosperms ; sori are only found in ferns ; and seed cones are only found in conifers and other gymnosperms.
Reproductive characters are therefore regarded as more useful for the classification of plants than vegetative characters. Plant biologists use morphological characters of plants which can be compared, measured, counted and described to assess the differences or similarities in plant taxa and use these characters for plant identification, classification and descriptions.
When characters are used in descriptions or for identification they are called diagnostic or key characters which can be either qualitative and quantitative. The detailed study of reproductive structures in plants led to the discovery of the alternation of generations , found in all plants and most algae , by the German botanist Wilhelm Hofmeister.
This discovery is one of the most important made in all of plant morphology, since it provides a common basis for understanding the life cycle of all plants. The primary function of pigments in plants is photosynthesis , which uses the green pigment chlorophyll along with several red and yellow pigments that help to capture as much light energy as possible. Pigments are also an important factor in attracting insects to flowers to encourage pollination.
Plant pigments include a variety of different kinds of molecule, including porphyrins , carotenoids , anthocyanins and betalains. All biological pigments selectively absorb certain wavelengths of light while reflecting others.
The light that is absorbed may be used by the plant to power chemical reactions, while the reflected wavelengths of light determine the color the pigment will appear to the eye. Plant development is the process by which structures originate and mature as a plant grows. It is a subject studies in plant anatomy and plant physiology as well as plant morphology. The process of development in plants is fundamentally different from that seen in vertebrate animals.
When an animal embryo begins to develop, it will very early produce all of the body parts that it will ever have in its life. When the animal is born or hatches from its egg , it has all its body parts and from that point will only grow larger and more mature.
By contrast, plants constantly produce new tissues and structures throughout their life from meristems  located at the tips of organs, or between mature tissues. Thus, a living plant always has embryonic tissues. The properties of organization seen in a plant are emergent properties which are more than the sum of the individual parts.
A vascular plant begins from a single celled zygote , formed by fertilisation of an egg cell by a sperm cell. From that point, it begins to divide to form a plant embryo through the process of embryogenesis. As this happens, the resulting cells will organize so that one end becomes the first root, while the other end forms the tip of the shoot. In seed plants, the embryo will develop one or more "seed leaves" cotyledons.
By the end of embryogenesis, the young plant will have all the parts necessary to begin in its life. Once the embryo germinates from its seed or parent plant, it begins to produce additional organs leaves, stems, and roots through the process of organogenesis. New roots grow from root meristems located at the tip of the root, and new stems and leaves grow from shoot meristems located at the tip of the shoot.
Growth from any such meristem at the tip of a root or shoot is termed primary growth and results in the lengthening of that root or shoot. Secondary growth results in widening of a root or shoot from divisions of cells in a cambium.
In addition to growth by cell division, a plant may grow through cell elongation. This occurs when individual cells or groups of cells grow longer. Not all plant cells will grow to the same length.
When cells on one side of a stem grow longer and faster than cells on the other side, the stem will bend to the side of the slower growing cells as a result. This directional growth can occur via a plant's response to a particular stimulus, such as light phototropism , gravity gravitropism , water, hydrotropism , and physical contact thigmotropism.
Plant growth and development are mediated by specific plant hormones and plant growth regulators PGRs Ross et al. Plants exhibit natural variation in their form and structure. While all organisms vary from individual to individual, plants exhibit an additional type of variation.
Within a single individual, parts are repeated which may differ in form and structure from other similar. This variation is most easily seen in the leaves of a plant, though other organs such as stems and flowers may show similar variation. There are three primary causes of this variation: positional effects, environmental effects, and juvenility. Transcription factors and transcriptional regulatory networks play key roles in plant morphogenesis and their evolution. During plant landing, many novel transcription factor families emerged and are preferentially wired into the networks of multicellular development, reproduction, and organ development, contributing to more complex morphogenesis of land plants.
Although plants produce numerous copies of the same organ during their lives, not all copies of a particular organ will be identical. There is variation among the parts of a mature plant resulting from the relative position where the organ is produced.
For example, along a new branch the leaves may vary in a consistent pattern along the branch. The form of leaves produced near the base of the branch will differ from leaves produced at the tip of the plant, and this difference is consistent from branch to branch on a given plant and in a given species.
This difference persists after the leaves at both ends of the branch have matured, and is not the result of some leaves being younger than others. The way in which new structures mature as they are produced may be affected by the point in the plants life when they begin to develop, as well as by the environment to which the structures are exposed.
This can be seen in aquatic plants and emergent plants. Temperature has a multiplicity of effects on plants depending on a variety of factors, including the size and condition of the plant and the temperature and duration of exposure.
The smaller and more succulent the plant , the greater the susceptibility to damage or death from temperatures that are too high or too low. Temperature affects the rate of biochemical and physiological processes, rates generally within limits increasing with temperature. When water freezes in plants, the consequences for the plant depend very much on whether the freezing occurs intracellularly within cells or outside cells in intercellular extracellular spaces.
The cells undergo freeze-drying, the dehydration being the basic cause of freezing injury. The rate of cooling has been shown to influence the frost resistance of tissues,  but the actual rate of freezing will depend not only on the cooling rate, but also on the degree of supercooling and the properties of the tissue. These freeze-dehydrated buds survived immersion in liquid nitrogen when slowly rewarmed.
Floral primordia responded similarly. In boreal species of Picea and Pinus , the frost resistance of 1-year-old seedlings is on a par with mature plants,  given similar states of dormancy.
Anatomy of Flowering Plants Notes for NEET, Download PDF!
The chapter Class 10th Maths Chapter 15 Exercise It is mentioned that even in the diversity the angiosperms have some common characteristics that include the presence of roots, stems, leaves, flowers, and fruits. The segment stresses the importance of knowing the standard technical terms and standard definitions for classifying and understanding higher plants. It also stresses the significance of learning the variations in different parts of plants found as adaptations of the plants to the environment. It gives the example of adaptations to different habitats, for protection, for climbing, storage and the like.
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Request PDF | On Mar 1, , David K. Ferguson published Anatomy of Flowering Plants: An Introduction to Structure and Development | Find.
Anatomy of Flowering Plants: An Introduction to Structure and Development
It's an important chapter of Structural Organisation in Plants and Animals unit. Here you will go through the detailed introduction about what is the Anatomy. Anatomy of an organism is defined as the study of its internal structure which further includes tissue organization and structure. A tissue can be defined as grouped cells sharing a common origin and performing a similar kind of function in multicellular organisms.
Register Now. Hey there! We receieved your request. It is present in the regions where an organ or a part of plant body is initiated.
Ничего. Вроде бы на нижней ступеньке никого .
NCERT Solutions for Class 11 Biology Chapter 5
Вирус. Все, что угодно, только не шифр, не поддающийся взлому. Стратмор сурово посмотрел на. - Этот алгоритм создал один самых блестящих умов в криптографии. Сьюзан пришла в еще большее смятение: самые блестящие умы в криптографии работают в ее отделе, и уж она-то наверняка хоть что-нибудь услышала бы об этом алгоритме.
С ужасом девушка увидела, что сумка застряла в двери. Она наклонилась и что было сил потянула ее, стараясь высвободить застрявшую часть. Затуманенные глаза Беккера не отрываясь смотрели на торчащий из двери кусок ткани. Он рванулся, вытянув вперед руки, к этой заветной щели, из которой торчал красный хвост сумки, и упал вперед, но его вытянутая рука не достала до .
The Tissue System
- Что он хочет этим сказать. - Четыре на шестнадцать, - повторил профессор. - Лично я проходил это в четвертом классе. Сьюзан вспомнила стандартную школьную таблицу. Четыре на шестнадцать. - Шестьдесят четыре, - сказала она равнодушно. - Ну и .
Стратмор ничего не. - Позвоните в банк данных! - приказала Сьюзан. - Предупредите их о вирусе. Вы заместитель директора АНБ и обязаны победить. Стратмор медленно поднял голову и как человек, принимающий самое важное решение в своей жизни, трагически кивнул.
Стратмор сидел на диване, небрежно положив берет-ту на колени.