Gymnosperms

Female Cone Female cone has whorl of loosely arranged megasporophylls. In cycas, whereas in pinus there is in compact arrangement of megasporophylls, behave ovuliferous scale. So, in pinus female cone behave as inflorescence due to aggregation of female flower (ovuliferous scale). Each megasporophyll quite large in size, bearing 1-5 pairs of big ovules of cycas whereas, in pinus there are ...

Following are the gymnosperms questions for papers. Students can prepare these important quiz questions to prepare for the exams and tests. Give occurrence of gymnosperms? Ans: Gymnosperm 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 ...

Terrestrial ecosystems are distinguished from aquatic ecosystems. An Aquatic Ecosystem is an ecosystem in a body of water. While the community of organisms and their environment that occurs on the land masses of continents and islands are Terrestrial Ecosystem. Aquatic Ecosystems Communities of organisms that are dependent on each other and on their environment, live in aquatic ecosystems. The two ...

Gymnosperms term was given by “Theophrastus” in his book “Enquiry into plants”. Gymnosperm has been derived from Greek words. (Gymno = Bare/Naked) (Spermas = seeded). Characteristics of Gymnosperms The characteristics of gymnosperms are as follow. Sub Groups of Spermatophytes  According to “Geobel” known as “phanerogams”. (Hidden sex organs i.e. archegonium and Antheridium).   They can survive for several years. They ...

Gymnospermae They are shrub or trees. The trees are rdsinous. Stern has central pith. Vascular bundles are present in rings. Secondar) growth occurs due to cambium. Leaves are needle like. They form cones. Ovule is naked. It is not covered by ovary. Pollination occurs through direct contacts. It has three orders:F I. Order Gnetaceae Order Coniferae Order Cycadaeeae Classification system ...

Principal Types of Gymnosperms On the basis of shoot apex three principle types of gymnosperms can be distinguished: The Cycas Type: In this type, three meristematic zones can be distinguished: Surface Meristem: The cells are not uniform in the appearance and divide anticlinally, periclinally and diagonally. The apical initials have been distinguished in the seedlings of Cycas revolute, but not ...

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 ...

 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 ...

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 ...

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 ...