সাইকাস, সুপারি গাছ, মস, কাঁঠাল গাছ, সরিষা
উপরে উল্লিখিত উদ্ভিদগুলাে কোন ধরনের, তাদের বৈশিষ্ট্য লিখ।
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Sycamore, betel tree, moss, jackfruit, mustard
Write down the characteristics of any of the plants mentioned above.
Answers
Answer:
Many cycad species are shrub-sized in stature, but some species are 20-60 ft (6-18 m) tall at maturity. The cycads typically have an unbranched central stem, which is thick and scaly. Most species grow relatively slowly and have a large, terminal rosette of leaves. The leaves of most species are compound, in that they are composed of numerous small leaflets. Cycad leaves remain green for 3-10 years, so they are considered evergreen. Many cycad species, though short in stature, have a thick tap root which can
Read more: Cycads - General Characteristics - Species, Cyanobacteria, Stem, and America - as much as 30-40 ft (9-12 m) beneath the soil surface. The function of the tap root is to take up water from deep beneath the surface. Cycads also produce coralloid (coral-like) roots, which grow near the surface and are associated with symbiotic cyanobacteria. In a process known as nitrogen fixation, the cyanobacteria take in atmospheric nitrogen gas (N2) and transform it to ammonia (NH3), a chemical form that can be used by the plant as a nutrient. In reciprocation, the plant provides habitat and carbohydrates to the plant