11th Standard Syllabus & Materials
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TN 11th Tamil இயற்கை வேளாண்மை,சுற்றுச்சூழல் -செய்யுள் - மனோன்மணீயம் Important Questions And Answers Study Material - QB365 Set A
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TN 11th Tamil என்னுயிர் என்பேன் -துணைப்பாடம் - இசைத்தமிழர் இருவர் Important Questions And Answers Study Material - QB365 Set A
NEW11th Standard
TN 11th Tamil மொழி கலை -செய்யுள் - ஒவ்வொரு புல்லையும் Important Questions And Answers Study Material - QB365 Set A
NEW11th Standard
TN 11th Tamil பீடு பெற நில் - இலக்கணம் - பகுபத உறுப்புகள் Important Questions And Answers Study Material - QB365 Set A
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TN 11th Tamil பீடு பெற நில் - துணைப்பாடம் - வாடிவாசல் Important Questions And Answers Study Material - QB365 Set A
NEW11th Standard
TN 11th Tamil பீடு பெற நில் - செய்யுள் - குறுந்தொகை Important Questions And Answers Study Material - QB365 Set A
Published on: 13/05/2022
QB365 provides detailed and simple solution for every Creative Questions in class 11 Biology Subject. It will helps to get more idea about question pattern in every Creative questions with solution.
latest Creative QuestionsDownload Tamil Nadu 11th Standard Biology question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Biology Test1.
What is Canada Balsam?
2.
How are the angiosperm woods classified based an seasonal changes.
3.
How are barks classified?
4.
What is amber?
5.
What are the differences between spring wood and Autumn wood?
1.
Abies balsamea is a gymnospennic plant. It produces canada balsam, from its resin ducts. It is used as mounting medium for microscopic slide preparation.
2.
Based on seasonal changes, wood can be classified into diffuse porous and ring porous wood.
Diffuse porous wood: Wood in which vessels are uniform In size and distribution throughout an annual ring. Eg: Acer
Ring porous wood: Pores of the early wood are larger than those of the late wood. Rings of wide and narrow vessels occur. Eg: Quercus
3.
(i) If the phellogen forms a complete cylinder around the stem, it gives rise to ring barks. Eg: Quercus.
(ii) When the bark is formed in overlapping scale like layers, it is known as scale bark. Eg Guava.
(iii) While ring barks normally do not peel off, scale barks peel off.
4.
(i) Plants secrete resins for their protective benefits. Amber is a fossilized tree resin especially from the wood, which has been appreciated for its colour and natural beauty since Neolithic times.
(ii) Much valued from antiquity to the present as a gemstone, amber is made into a variety of decorative objects.
(iii) Amber is used in jewellery. It has also been used as a healing agent in folk medicine.
5.
| Spring wood or Early wood | Autumn wood or Late wood |
| The activity of cambium is faster. | Activity of cambium is slower |
| Produces large number of xylem elements | Produces fewer xylem elements |
| Xylem vessels/tracheids have wider lumen. | Xylem vessels/tracheids have narrow lumen. |
| Wood is lighter in colour and has lower density | Wood is darker in colour and has a higher density. |
11th Standard Syllabus & Materials
11th Standard
TN 11th Tamil பீடு பெற நில் - செய்யுள் - காவடிச்சிந்து Important Questions And Answers Study Material - QB365 Set A
NEW11th Standard
TN 11th Tamil பீடு பெற நில் - உரைநடை - மலை இடப்பெயர்கள் : ஓர் ஆய்வு Important Questions And Answers Study Material - QB365 Set A
NEW11th Standard
TN 11th Tamil மாமழை போற்றுதும் - துணைப்பாடம் - யானை டாக்டர் Important Questions And Answers Study Material - QB365 Set A
NEW11th Standard
TN 11th Tamil மாமழை போற்றுதும் - செய்யுள் - ஐங்குறுநூறு Important Questions And Answers Study Material - QB365 Set A
Tamilnadu Stateboard 11th Standard Subjects
Maths
Commerce
Economics
Biology
Business Maths and Statistics
Accountancy
Computer Science
Physics
Chemistry
Maths
Biology
Economics
Physics
Chemistry
History
Business Maths and Statistics
Computer Science
Accountancy
Computer Applications
History
Computer Technology
Commerce
Computer Applications
Computer Technology
Tamil
English
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