11th Standard Syllabus & Materials
11th Standard
TN 11th Tamil இயற்கை வேளாண்மை,சுற்றுச்சூழல் -செய்யுள் - மனோன்மணீயம் Important Questions And Answers Study Material - QB365 Set A
NEW11th Standard
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
NEW11th Standard
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: 26/06/2021
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.
Download 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 prosenchyma?
2.
What is Protoxylem lacuna?
3.
What is starch sheath?
4.
Name the substances which get deposited at the corners of collenchymatous cells. What is the purpose of such deposition in these tissues?
5.
In the absence of a nucleus how are the functions of a sieve tube maintained?
1.
Parenchyma cells become elongated, pointed and slightly thick walled. It provides mechanical support
2.
(i) In Monocot stem, Xylem vessels are arranged in the form of 'Y'. The two metaxylem vessels are located at the upper two arms and one or two protoxylem vessels occur at the base.
(ii) In a mature bundle, the lowest protoxylem disintegrates and forms a cavity known as protoxylem lacuna.
3.
In Dicot stem, the cells of the endodermis are rich in starch grains and thus this layer is also referred to as the starch sheath.
4.
(i) The cells of collenchyma have unevenly thickened walls. It contains more of hemicellulose and pectin besides cellulose.
(ii) Thus the tissue serves as a mechanical tissue and also gives elasticity to the growing parts of the plants.
(iii) Based on pattern of pectinisation of the cellwall, collenchyma is divided into three types.
5.
(i) Sieve tubes are associated with companion cells. Which are thin walled specialised parenchyma cells with a nucleus.
(ii) They are living and are connected to sieve tube through pits found in their lateral walls.
(iii) Cytoplasmic connections are maintained through pits between sieve tube and companion cell.
(iv) This helps to maintain the pressure gradient in sieve tubes.
(v) The Nucleus of companion cells control the sieve tube.
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
French
Tamilnadu Stateboard Standards
