8th Standard Syllabus & Materials
8th Standard
TN 8th Tamil இயல் 3 - கல்வி கரையில - வினைமுற்று Important Questions And Answers Study Material - QB365 Set A
NEW8th Standard
TN 8th Tamil இயல் 2 - ஈடில்லா இயற்கை - மயங்கொலிகள் Important Questions And Answers Study Material - QB365 Set A
NEW8th Standard
TN 8th Tamil இயல் 2 - ஈடில்லா இயற்கை -பட்டமரம் Important Questions And Answers Study Material - QB365 Set A
NEW8th Standard
TN 8th Tamil இயல் 2 - ஈடில்லா இயற்கை - இயற்கையை போற்றுவோம் Important Questions And Answers Study Material - QB365 Set A
NEW8th Standard
TN 8th Tamil இயல் 1 - தமிழ் இன்பம் - ஆழிக்கு இணை Important Questions And Answers Study Material - QB365 Set A
NEW8th Standard
TN 8th Tamil இயல் 2-ஈடில்லா இயற்கை - திருக்குறள் 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 8 Science Subject. It will helps to get more idea about question pattern in every book back questions with solution.
Download Tamil Nadu 8th 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.
Write any four characters of pteridophytes.
2.
How many classes are there in Bryophytes? What are they?
3.
Write the differences between algae and fungi.
4.
Write any three economic importance of algae.
5.
Write a short note on natural system of classification
1.
Characters of Pteridophytes:
1 Pteridophytes are the first true land plants with xylem and phloem. Hence it is called vascular cryptogams.
2 Pteridophytes exhibit alternation of generation. The diploid sporophytic phase alternates with the haploid gametophytic phase.
3 The main plant body is sporophytes, which is the dominant phase, differentiated into true root, stem and leaves.
4. Sporophytes reproduce by means of spores. Spores are produced in sporangium.
2.
There are three classes in Bryophyta. They are:
1. Class I - Hepaticae (Liverworts) eg: Riccia
2. Class II - Anthocerotae (Hornworts) eg. Anthoceros
3. Class III - Masci (Mosses) eg.Funtaria
3.
| S.No | Algae | Fungi |
| 1 | Algae are autotrophs | Fungi are heterotrophs |
| 2 | It has pigments | It has no pigments |
| 3 | Reserve food material is starch. | Reserve food materials are glycogen and oil |
| 4 | Some algae are Prokaryotic in nature | All are eukaryotic nature |
| 5 | lEg; Nostac, Anabenae | Eg: Agaricus |
4.
Agar Agar:
1. Agar Agar is extracted from some red algae namely Gelidium, Gracillaria etc
2. which is used to prepare growth medium in laboratories.
Algae in space travel:
1. Chlorella pyrenoidosa is used in space travel to get rid of Co, and decompose human wastes
Single cell protein (SCP):
1. Some of the single cell algae and blue green algae are used to produce protein.
2. Eg: Chlorella, spirulina
5.
Natural system of classification:
i) In this system plants are classified on the basis of their morphological and reproductive characters of the seeded plants.
ii) This classification is widely used in many Herbaria and botanical gardens all over the world.
iii) Eg: Bentham and Hooker's classification
8th Standard Syllabus & Materials
8th Standard
TN 8th Tamil இயல் 3 - கல்வி கரையில - பாடறிந்து ஒழுகுதல் Important Questions And Answers Study Material - QB365 Set A
NEW8th Standard
TN 8th Tamil இயல் 3-கல்வி கரையில - பல்துறைக் கல்வி Important Questions And Answers Study Material - QB365 Set A
NEW8th Standard
TN 8th Tamil இயல் 3-கல்வி கரையில - புத்தியைத் தீட்டு Important Questions And Answers Study Material - QB365 Set A
NEW8th Standard
TN 8th Tamil இயல் 2 - ஈடில்லா இயற்கை - தமிழர் மருத்துவம் ( நேர்காணல்) Important Questions And Answers Study Material - QB365 Set A
Tamilnadu Stateboard 8th Standard Subjects
Tamilnadu Stateboard Standards
