FERNS-PTEROPSIDA STUDY

FERNS-PTEROPSIDA STUDY Occurrence Polypodium is a perennial herb. It is found mostly in temperate regions. It has worldwide distribution. Mostly is attached to some rocks. But some forms are epiphytic. General structure The plant body is sporophyte. Plant body is divided into rhizome. leaves and roots. 1.  Rhizome: It forms the main stem of the plant. Rhizome is rounded, underground. ...

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STUDY OF PLANT SEED-SEED HABIT

STUDY OF PLANT SEED-SEED HABIT SEED HABIT A seed consists of an embryo, stored food and a seed coat. The seed habit is the most complex and evolutionary successful method of sexual reproduction. It is found in vascular pIants. Today, seed plants, gymnosperms and angiosperms flowering plants are the most diverse lineage within the vascular plants. Most of this diversity ...

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Morphology of Plants Leaf

Morphology of Plants  Leaf Leaf is principal appendage of the stem or on branches of a plant. They arise from nodes and bear lateral buds in their axils. A leaf is a chief photosynthetic organ of a plant. They are developed in acropetal succession and are exogenous in origin. Leaf Morphology: Each leaf consists of a green, flattened portion, the ...

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Gymnosperms Study

Occurrence Gymnosperms are naked seeded plants. Gynmosperms are a group of ancient plants. They become dominant in the Jurassic period Most of the gymnosperms are evergreen trees. Some shrubby pl..flas are also found in this group. They have worldwide distribution. They are most abundant in the temperate region. The fossils of gymnosperms are found near coal and oil deposits. Life ...

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Gymnosperms-Cycas Study

 Gymnosperms-Cycas Study Occurrence Cycas has a limited distribution. It is found in south East Asia and Australia. Cycas is also cultivated as an ornamental plant in the gardens and parks. Cycas plants live upto hundred years or more. Cycas is called a living fossil. It has several characters common with the General structure The plant body is a sporophyte. It ...

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Gymnosperms-Pinus Study

Gymnosperms Pinus Study cones Occurrence The genus Pinus has about 90 species. It has world wide in distribution. They are mostly present in the temperate regions. Four species of pinus are found in Pakistan: Pinus wallichiana; Pinus halepensis; Pinus roxburghil; Pinus gerardiana General structure The plant body is sporophyte. It is an evergreen tall tree. Plant body is divided into ...

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EPHEDRA-STUDY

Occurrence Ephedra is an arid plant. It is found in Europe, Western and Central Asia and Central and South America. It is also found in arid areas of Pakistan. Ephedra is source of drug Ephedrine. It is used for the treatment of asthma, cough and hay-fever. General structure The plant body of Ephedra is sporophyte. It is a bushy plant. ...

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STUDY OF ANGIOSPERM

STUDY OF ANGIOSPERM Occurrence Angiosperms are flowering plant. Their seeds are covered by fruits. Their fertile leaves bear ovules. The fertile leaves are folded and joined to from ovaries. The ovary is changed into a fruit after fertilization. There are 235,000 species of angiosperms out of 360,000 known species of plants. Angiosperms are heterosporous plants. These are most successful plants ...

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Meristem

STUDY OF MERISTEM The tissues in which the cells are undifferentiated and capable of division are called meristem.  The activity of meristem Causes growth in plant. Meristem adds new cells continuously. The apices of roots, shoots and their lateral branches have meristems at their tips. It increases length or the respective axis. Other meristems are found in the mature portions ...

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DEVELOPMENT STUDY OF ENDOSPERM

DEVELOPMENT STUDY OF ENDOSPERM DEVELOPMENT STUDY OF ENDOSPERM The primary endosperm nucleus divides repeatedly. It forms polyploidy nutritive tissue called endosperm. There are two types of seeds for storage of food: b)  Endospertnic or albuminous seed: The endosperm supply food to the 0.–weloping embryo. Such seeds are called endospermic seeds. in plants like corn, wheat, the endosperm tissue is present ...

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