9th Standard Syllabus & Materials
9th Standard
TN 9th Tamil உள்ளத்தின் சீர் -கற்கண்டு (இலக்கணம்) - தொடர் இலக்கணம், ஆகுபெயர் Important Questions And Answers Study Material - QB365 Set A
NEW9th Standard
TN 9th Tamil உள்ளத்தின் சீர் -விரிவானம் (துணைப்பாடம்) - தாய்மைக்கு வறட்சி இல்லை! Important Questions And Answers Study Material - QB365 Set A
NEW9th Standard
TN 9th Tamil உள்ளத்தின் சீர் -கவிதை பேழை (செய்யுள்) - மார்கழி பெருவிழா Important Questions And Answers Study Material - QB365 Set A
NEW9th Standard
TN 9th Tamil உயிருக்கு வேர்-இலக்கணம் - பகுபத உறுப்பிலக்கணம் Important Questions And Answers Study Material - QB365 Set A
NEW9th Standard
TN 9th Tamil அமுதென்று பேர் - இலக்கணம்-எழுத்து -அளபெடை Important Questions And Answers Study Material - QB365 Set A
NEW9th Standard
TN 9th Tamil அமுதென்று பேர்-துணைப்பாடம் - ஆறாம்திணை Important Questions And Answers Study Material - QB365 Set A
Published on: 16/06/2021
QB365 provides detailed and simple solution for every Book back Questions in class 9 Science Subject. It will helps to get more idea about question pattern in every book back questions with solution.
Download Tamil Nadu 9th Standard Science 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 Science Test1.
If cell (A) has undergone one mitotic division and another cell (B) has completed its meiotic division. The number of cells produced in A and B would be
Cell A: Cell B :
2.
List out the differences between mitosis and meiosis.
3.
What are meristems? Describe the distribution and functions of various types of meristems.
4.
Which are not true cells in the blood? Why?
5.
What is the consequence that occur if all blood platelets are removed from the blood?
1.
Cell A : 2 daughter cells
Cell B : 4 daughter cells
2.
| Mitosis | Meiosis |
| Occurs in somatic cells. | Occurs in reproductive cells. |
| Involved in growth and occurs continuously throughout life. | Involved in gamete formation only during the reproductively active age. |
| Consists of single division. | Consists of two divisions. |
| Two diploid daughter cells are formed. | Four haploid daughter cells are formed. |
| The chromosome number in the daughter cell is similar to the parent cell (2n). | The chromosome number in the daughter cell is just half (n) of the parent cell. |
| Identical daughter cells are formed. | Daughter cells are not similar to the parent cell and are randomly assorted. |
3.
Meristematic tissues are group of immature cells that are capable of undergoing cell division. They occur in zones where grown can take place in plants.
Types of Meristems:
| Type | Distribution | Function |
| I. Classification of meristems based on origin and development | ||
| a) Promeristem or primordial meristem | Tip of shoot and root | Divide to form primary meristerm |
| b) Primary meristem | Below the promeristem of shoot and root apex | Divide to form permanent tissues. |
| c) Secondary meristem | Derived from primary permanent tissues ego cork-cambium | Divide to form tissues during secondary growth |
| II. Classification of meristems based on position in the plant | ||
| a) Apical meristem | Apices or growing points of root, shoot | Bring about increase in length |
| b) Intercalary meristem | Lies between regron of permanent tissues. Eg. base of leaf | Forms branches |
| c) Lateral meristem | Arranged parallel to sides of ongin and divide radially | Form secondary permanent tissues and increase the thickness of the plant part. |
| III. Classification of meristems based on function | ||
| a) Protoderm meristem | Outermost layer of the young growing region | Forms epidermal tissues |
| b) Procambium meristem | Vascular bundle | Gives rise to vascular tissues |
| c) Ground meristem | Ground tissue system | Forms ground tissues like pith, cortex etc., |
| IV. Classification of meristems based on Plane of division | ||
| a) Mass meristem | Cortext and pith | Cell division occurs in all planes leading to increase in volume. |
| b) Rib or file meristem | Cells divide III one plane only | Formation of filaments ego algae |
| c) Plate meristem | Cells divide III two planes | Increase III the area of an organ ego Leaf formation. |
4.
Red blood cell and platelets are not true cells in the blood, because they lack of nucleus.
5.
If all platelets are removed from the blood, the blood clotting mechanism will be stopped. The person will die.
9th Standard Syllabus & Materials
9th Standard
TN 9th Tamil உள்ளத்தின் சீர் - திருக்குறள் Important Questions And Answers Study Material - QB365 Set A
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TN 9th Tamil உள்ளத்தின் சீர் - மணிமேகலை Important Questions And Answers Study Material - QB365 Set A
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NEW9th Standard
TN 9th Tamil உயிருக்கு வேர் - தண்ணீர் Important Questions And Answers Study Material - QB365 Set A
Tamilnadu Stateboard 9th Standard Subjects
Tamilnadu Stateboard Standards
