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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PLANT EMBRYOLOGY STUDY

PLANT EMBRYOLOG STUDY EMBRYOLOG Early development of Capsella bursa–pastoris Following developmental changes take place in the embryo CopseIla bursa pastoris: I. First division of Oospore: Its oospore increases in size. It divides transversely in two cells. The cell toward the microphyll end is called suspensor cell. The cells towards other side is called embryonal cell. Embryonal cell forms the major ...

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GYMNOSPERMS SHORT QUESTIONS FOR TEST AND PAPER

GYMNOSPERMS SHORT QUESTIONS  FOR TEST AND PAPER YMNOSPERMS SHORT QUESTIONS 1.  Give occurrence of Gymnosperms. Ans: Gymnosperms are naked seeded plants. Gymnosperms are a group of ancient plants. They become dominant in the Jurassic period. Most of the gymnosperms are evergreen trees. Some shrubby plants are also found in this group. They have worldwide distribution. They are most abundant in the temperate ...

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Female Gametophyte or Embryo SAC Development

Female Gametophyte or Embryo SAC Development Female Gametophyte or Embryo SAC Development  Types of embryo Sac Development There we types of embryo sac development. The classification is based on: The number of 9 ses or spore nuclei entering into the formation of embryo sac Thus embryo sac may be monosporic, bisporic or tetrasporic tyr The number, arrangement, and chromosome number ...

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SHORT QUESTIONS OF MORPHOLOGY OF PLANTS FOR TEST AND PAPER

1. Differentiate between tap and adventitious roots. Ans: Tap root arise from the embryo. Adventitious root develops from other mature tissues of plant like stem etc. 2. What are root hairs? Give their functions. Ans: A root hair starts its growth as a small papilla on the outer wall. The nucleus and cytoplasm migrate into the papilla. The papilla grows ...

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