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10th Science English Medium 2nd Assignment July 2021 Answerkey

10th Science English Medium 2nd Assignment July 2021 Answerkey:- To help 10th class Tamil Nadu students we provide answerkey for the 10th science English medium 2nd assignment answer key here.we also have Tamil medium science 2nd assignment on another page

Assignment
Class-10 Subject: SCIENCE
UNIT – VII- Atoms and Molecules
Part – A
I.One Mark Questions

1. Number of electrons, protons and neutrons present in 17Cl35, 17Cl37 is…………….


a) 17e ̄ , 17p+, 17n
17e ̄ , 17p+, 19n
b) 18e ̄ , 18p+, 17n
17e ̄ , 20p+, 19n
c) 17e ̄ , 17p+, 18n
17e ̄ , 17p+, 20n
d) 18e ̄ , 17p+, 18n
20e ̄ , 20p+, 17n

Answer:- a) 17e ̄ , 17p+, 17n
17e ̄ , 17p+, 19n


2. Isobars are defined as………..


a) Elements show same atomic number with different mass number
b) Elements show same mass number with different atomic number
c) Elements show same valency
d) None of these

Answer:- b) Elements show same mass number with different atomic number



3.The Atomicity of Glucose molecule is………………..


a) 6

b) 12

c)24

d) 18

Answer:- c)24



4.The mass of 5 moles of sodium is……….


a) 46g

b) 34g

c) 105g

d) 115g

Answer:- d) 115g



5.Number of atoms present in 3 moles of iron is——–


a) 6.023 x 1023

b) 18.069 x 1023

c) 12.046 x 1023

d) None

Answer:- b) 18.069 x 1023



Part – B
II. Short Answer.


6.Define : Relative atomic mass



7.Give any two examples for heteroatomic molecules

HI, HCl, CO, HBr, HF.



8.Calculate the number of moles in 46 g of Sodium?

Formula to calculate the no. of moles:

No of moles = known mass of a substance/ molar mass of the substance.

No. of moles of Na= 46 / 23

                            = 2 moles

So in 46 grams, 2 moles of Na are present.



9.Calculate the mass of the 5×1023 molecules of Glucose.



10.Calculate the number of molecules in 11.2 litre of CO2 at S.T.P.


Part – C
III. Write in detail.


1.Give the salient features of “Modern Atomic Theory”.

The salient features of “Modem atomic theory” are,

  1. An atom is no longer indivisible.
  2. Atoms of the same element may have different atomic mass.
  3. Atoms of different elements may have the same atomic masses.
  4. Atoms of one element can be transmuted into atoms of other elements. In other words, an atom is no longer indestructible.
  5. Atoms may not always combine in a simple whole-number ratio.
  6. Atom is the smallest particle that takes part in a chemical reaction.
  7. The mass of an atom can be converted into energy [E = mc2].


Assignment
Class-10 Subject:SCIENCE
UNIT – XII
Plant Anatomy and Plant Physiology
Part – A
I. OneMark Questions



1.Who is the father of plant anatomy?


a) Sachs

b) Nehemiah Grew

c) Melvin Calvin

d) C.N.R.Rao

Answer : b) Nehemiah Grew



2.The group of cells which are similar or dissimilar in structure and
origin that perform similar function is called


a) Organ System

b) Vascular Bundles

c) Tissues

d) Pericycle

Answer : c) Tissues



3.The pores present in Epidermis are called


a) Stomata

b) Cuticle

c) Trichome

d) Stele

Answer : a) Stomata



4.Xylem and Phloem are present in different radii of ———-


a) root

b) stem

c) leaf

d) flower

Answer : a) root (Xylem and phloem are arranged in an alternate matter or different radii are called Radial vascular bundle. Eg: roots)



5.If xylem and phloem lie on the same radii that vascular bundle is…..


a) radial bundle

b) conjoint bundle

c) concentric and amphivasal

d) amphicribral

Answer : b) conjoint bundle



Part – B
II. Short Answer.


1.What are tissues?



2.Classify the types of plant tissues.

Merismatic tissue and permanent tissue



3.What are the functions of Dermal or Epidremal tissue system?

  1. Epidermis protects the inner tissues.
  2. Stomata helps in transpiration.
  3. Root hairs help in absorption of water and minerals.


4.Write a short note about vascular bundle of Dicot root.



5.What is Radial vascular bundle? Give example.

Radial vascular bundle: Xylem and phloem are arranged in an alternate matter or different radii are called Radial vascular bundles. Eg: roots



Part – C
III. Write in detail.


6.a)Differentiate the following
Monocot root and Dicot root

Monocot RootDicot Root
Xylem is a poly archXylem is usually tetrarch
Pith is usually large at the centerPith is usually absent
Conjunctive tissue is made up of sclerenchymaConjunctive tissue is made up of parenchyma
There is no secondary growthSecondary growth is generally present


b) Draw a neat labelled diagram of Radial vascular bundle

2 COMMENTS

  1. Please give all the assignment in clear and neet it is conference us please send it neet all the subject

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