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Tn 9th Science Unit 18 Assignment Answers EM

Tn 9th Science Unit 18 Assignment Answers EM :

Tn 9th Science Unit 12 Assignment Answers EM : Here is the full assignment answer key for TNSCERT 9th science assignment in both print and pdf download with answers, This page gives you both English medium and we also have Tamil medium answers for 9th standard science. As per the Tamilnadu educational departments order, all school students must submit their assignments on time, But most of the students do not even start the assignment process, so we want to help those students, and here is the full assignment answer key

9th Science English Medium Assignment 2021 with Answer

For Tamil Medium Answers Please Click Here

Here are the Full Questions in PDF – Click Here to Download

Assignment

Class : 9 Subject : Science

Biology

Unit 18 – Organisation of Tissues

Part- A

I. 1 Mark Questions :


1) Due to Diarrhoea, dehydration occurs in our body. physician finds out the illness with pulse. which tissue shows the dehydration in our body?
a) Epithelial Tissue

b) Connective Tissue

c) Muscular Tissue

d) Nervous Tissue

Answer:- a) Epithelial Tissue



2) During running race, Sam has got sprain in his leg. Sprain is caused by………….
a) Excessive Stretching of ligaments

b) Contraction of ligaments

c) Flexibility of ligaments

d) Strengthening of ligaments

Answer:- a) Excessive Stretching of ligaments



3) They are capable of amoeboid movement. They engulf or destroy corona viruses. And play an important role in body’s defense mechanism. Which tissue is responsible for the human body’s defense mechanism?
a) Erythrocytes

b) Leucocytes

c) Thrombocytes

d) Lymph

Answer:- b) Leucocytes


4) The study of tissues is known as …………..
a) Entomology

b) Ornithology

c) Histology

d) Oncology

Answer:- c) Histology


5) When exposed to light, parenchyma cells may develop chloroplasts in them, these cells are called as ………….
a) Collenchyma

b) Aerenchyma

c) Chlorenchyma

d) Sclerenchyma

Answer:- c) Chlorenchyma

Part- B

II. Short Answer

1.What are intercalary meristems?

Intercalary meristem lies between the region of permanent tissues and is part of the primary meristem which is detached due to the formation of intermittent permanent tissues.



2.What is a complex tissue?

Complex tissues are made of more than one type of cells that work together as a unit.



3.Explain parenchyma tissue.

Parenchyma is simple permanent tissue composed of living cells. Parenchyma cells are thin-walled, oval, rounded, or polygonal in shape with well-developed spaces among them.

Part- C

III. Write in detail.


1.Describe permanent tissues.

Permanent tissues are those in which, growth has stopped either completely or for the time being. At times, they become meristematic partially or wholly. Permanent tissues are of two types, namely, SImple tissue and comples tissues

Simple tissues are homogeneous tissues composed of structurally and functionally similar cells, Eg. , Parenchyma, Collenchyma and Sclerenchyma

Complex tissues are made of more than one type of parenchyma and sclernchyma cells, however,collenchymatous cells are not present in such tissues. COmmon example are xylem and phloem

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