Quiz_Gymnosperm 1. Which character in a Cycas leaflet indicates its xerophytic nature? Epidermis with cuticle Sunken stomata All of the above Mesophyll with palisade and spongy tissue Explanation:Cycas leaflets exhibit several xerophytic adaptations such as sunken stomata, a thick cuticle, and specialized mesophyll tissue. These features help the plant conserve water and survive in dry conditions. 2. 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. 3. Simple polyembryony is found in : Pinus only Cycas only Absent in both Cycas and Pinus both Explanation:Simple polyembryony, where multiple embryos arise from different cells within the ovule, occurs in both Cycas and Pinus, enhancing the chances of successful seedling development. 4. The number of neck canal cells in Cycas are: Four Two One but with two nuclei Nil Explanation:In Cycas, neck canal cells are absent, which is a deviation from the typical structure found in other gymnosperms and some ferns. 5. In Cycas: Male cones and megasporophylls are found on the same plant Male cones and megasporophylls are found on different plants Microsporophyll and megasporophylls are not differentiated Microsporophyll and megasporophylls are in the same cone Explanation:In Cycas, male cones and megasporophylls (female reproductive structures) are found on different plants, reflecting its dioecious nature. 6. Mucilaginous canals in Cycas are found in : Pith Cortex of stem Cortex and pith Vascular bundles Explanation:Mucilaginous canals in Cycas are found in the cortex of the stem, where they secrete mucilage that helps in the storage and transport of nutrients. 7. The spur of Pinus roxburghii has : 2-needles 4-needles 5-needles 3-needles Explanation:Pinus roxburghii, commonly known as chir pine, has spurs with three needles, which is a distinctive feature of this species. 8. Proembryo in Pinus is : Four tiered Three tiered None of the above Two tiered Explanation:The proembryo in Pinus is four-tiered, consisting of a series of cell divisions that form the early stages of embryo development before differentiation into various tissues. 9. Pollination in Cycas takes place by : Insects Wind Man Water Explanation:Pollination in Cycas is primarily anemophilous, meaning it is carried out by the wind. The male cones release pollen that is carried by the wind to the female cones. 10. 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. Loading …
