Quiz_Gymnosperm 1. Cleavage polyembryony is found in : Pinus Cycas Absent in both Cycas and Pinus both Explanation:Cleavage polyembryony, where multiple embryos develop from a single fertilized egg, is observed in Pinus, allowing for the potential development of multiple seedlings from one seed. 2. Fruits are not found in Cycas because: There is no pollination There is no fertilization There is no ovary Seeds are not formed Explanation:Cycas does not produce fruits because it lacks an ovary. In gymnosperms, seeds are exposed and not enclosed within a fruit, which is a characteristic feature of angiosperms. 3. What is the position of neck canal cells in Pinus? There are two neck canal cells There is only one neck canal cell Neck canal cells are absent There is one neck canal cell with two nuclei Explanation:In Pinus, neck canal cells are absent, which is a deviation from the typical structure found in other gymnosperms and some ferns. 4. Pinus microsporophyll bears: Many microsporangia on abaxial surface Two microsporangia on abaxial surface Many microsporangia on adaxial surface Two microsporangia on adaxial surface Explanation:The microsporophylls of Pinus bear many microsporangia on their abaxial (lower) surface. This arrangement allows for the production and release of a large number of pollen grains. 5. Dicot leaf-like reticulate venation occurs in leaves of: Pinus Cycas Gnetum Ephedra Explanation:Gnetum, a gymnosperm, exhibits reticulate venation similar to dicot leaves. This feature is unusual among gymnosperms and is more commonly associated with angiosperms. 6. Select the correct statement: (NEET 2016) Salvinia, Ginkgo and Pinus all are gymnosperms Gymnosperms are both homosporous and heterosporous The leaves of gymnosperms are not well adapted to extreme of climate Sequoia is one of the tallest trees Explanation:Sequoia, also known as the giant redwood, includes some of the tallest trees in the world. These trees can reach heights of over 300 feet, making them the tallest living organisms on Earth. 7. The roots of Cycas are : Coralloid and normal Adventitious Normal only Coralloid only Explanation:Cycas plants have two types of roots: normal roots that grow in the soil and coralloid roots that have a symbiotic relationship with cyanobacteria, aiding in nitrogen fixation. 8. The stem of adult Cycas plant is covered with persistent leaf-bases which are : Permanent and are left by fallen old leaves Deciduous Temporary and left by the shedding of new leaves Permanent and are left by the shedding of old stems Explanation:The stem of an adult Cycas plant is covered with persistent leaf bases that remain after the leaves have fallen, providing protection to the stem. 9. In Cycas microsporangia are borne on: Upper surface of microsporophyll Lower surface of microsporophyll Apex of microsporophyll Margin of microsporophyll Explanation:In Cycas, microsporangia are found on the lower surface of the microsporophyll. This arrangement facilitates the release and dispersal of pollen grains. 10. Transfusion tissue is present in the leaflet of: Dryopteris Cycas Funaria Angiosperms Explanation:Transfusion tissue in Cycas leaflets helps in the lateral conduction of water and nutrients. It is located around the vascular bundles and is essential for the efficient transport of resources within the leaf. Loading …
