CLASS 9 Holiday Home Work

HOLIDAYS HOME WORK

May- June 2020

CLASS 9

SCIENCE

⇨The WORKSHEET is to be done in your Notebooks.
⇨Experiments are to be written in the Practical File.

WEEK 1

Topics:

1. Students will write an assignment on the topic given as part of Portfolio Assessment.

2. Students will write the Experiment 7 from the Lab Manuals

(In case students do not have lab manuals, PDF will be shared on WhatsApp Group.

How to write in the practical file:

RHS

·         AIM

·         MATERIAL REQUIRED

·         PROCEDURE (in the third person) (no theory)

·         RESULT ( to be left blank)

·         PRECAUTIONS

LHS

·         Diagrams (refer to the image as an example)

·         Diagrams are to be drawn by pencil only

·         Ex. 1 melting and boiling point

·         Ex. 2 Plant & cheek Cell

·         Ex. 3 Parenchyma, collenchyma, sclerenchyma, nerve tissue, cardiac muscle

·         (INSTRUCTIONS ON HOW TO WRITE AN EXPERIMENT IS GIVEN ON BLOGS AS WELL)

·         Observation Table to be drawn with pencil. (leave as blank)

1. THE BLOG COMPRISES OF ASSIGNMENT WORK AS PART OF YOUR PORTFOLIO ASSESSMENT:

(a) WRITE HOW THE USE OF HYBRID CROPS HAS BEEN A BOON TO THE SOCIETY.

http://www.bluefingeralliance.org.uk/blue-finger-explained/

THE FOLLOWING IS A LINK TO AN EDITORIAL WHICH GIVES YOU AN INSIGHT INTO THE TOPIC

https://vigyanprasar.gov.in/wp-content/uploads/April2011english.pdf

IMPORTANT INSTRUCTIONS:

1. AS I HAVE PROVIDED YOU WITH THE RIGHT STUDY MATERIALS PLEASE DO NOT SPEND MUCH TIME TO SEARCH ON THE INTERNET.

2. USE YOUR OWN CREATIVITY TO WRITE OUT OF THE BULK.

3. USE FACTS ONLY.

4. COMPILE YOUR WORK IN A FOLDER. WRITE ON A4 SHEETS.

5. USE COLOUR PENS/DRAW PICTURES TO MAKE IT LOOK ILLUSTRATIVE. 

MARKS WILL BE AWARDED ON THE BASIS OF THE ABOVE INSTRUCTIONS.

2. Experiment Work

Experiment [I]: This is experiment 7 of the lab manual i.e. Melting point of ice and boiling point of water.

https://youtu.be/ZF5Ta83SL3U (Melting point of ice)

https://youtu.be/nZXoe0fgJ8Q?t=11 (Boiling point of water.)

WEEK 2

Topics:

1. Students will solve the WORKSHEET ON LESSON: MATTER IN OUR SURROUNDINGS.

WORKSHEET 01

MATTER IN OUR SURROUNDINGS

[A] VERY SHORT ANSWER:

1. Name the three states of matter. Give one example of each.
2. What are the two ways in which the physical state of matter can be changed?
3. Explain how gases can be liquefied?
4. What is sublimation? Give examples.
5. Define latent heat of fusion.
6. Define latent heat of vaporization.
7. What produces more severe burns, boiling water or steam?
8. How can the boiling point of a liquid be raised, without adding any impurity?
9. In how many forms did the earlier scientists classify matter?
10. Why does a summer rainstorm lower the temperature?
11. A drop of dettol got evenly distributed in water. How?
12. Liquid nitrogen is used as a commercial refrigerant to flash freeze foods. Nitrogen boils at 196°C. What is this temperature on the Kelvin temperature scale?
13. What property or properties of gases can you point to support the assumption that most of the volume in a gas is empty space?
14. What is unit cell?
15. What is the effect on surface tension of temperature?
16. Surface tension is same for different liquids. Explain.

[B] MCQ’s:

Question 1.The quantity of matter present in an object is called its:
(a)Weight
(b)Gram
(c)Mass
(d)Density

Question 2.At higher altitudes:
(a)Boiling point of a liquid decreases
(b)Boiling point of a liquid increases
(c)No change in boiling point
(d)Melting point of solid increases

Question 3.The boiling point of alcohol is 78℃. What is this temperature in Kelvin scale:
(a)373 K
(b)351 K
(c)375 K
(d)78 K

Question 4.In which phenomena water changes into water vapour below its B.P.?
(a)Evaporation
(b)Condensation
(c)Boiling
(d)No such phenomena exist

Question 5.The boiling point of water on Celsius and Kelvin scale respectively is:
(a)373, 273
(b)0, 273
(c)273, 373
(d)100, 373

Question 6.The liquid which has the highest rate of evaporation is:
(a)Petrol
(b)Nail- polish remover
(c)Water
(d)Alcohol

Question 7.When we put some crystals of potassium permanganate in a beaker containing water, we observe that after sometime whole water has turned pink. This is due to:
(a)Boiling
(b)Melting of potassium permanganate crystals
(c)Sublimation of crystals
(d)Diffusion

Question 8.The state of matter which consists of super energetic particles in the form of ionized gases is called:
(a)Gaseous state
(b)Liquid state
(c)Bose- Einstein condensate
(d)Plasma state

Question 9.The force that binds the particles of matter together is known as:
(a)Intermolecular space
(b)Bond
(c)Intermolecular force
(d)Nuclear force

Question 10.The change of a liquid into vapour is called:
(a)Vaporization
(b)Solidification
(c)Sublimation
(d)None of these

Question 11.Which of the following describes the liquid phase?
(a)It has a definite shape and a definite volume
(b)It has a definite shape but not a definite volume
(c)It has a definite volume but not a definite shape

Question 12.When a teaspoon of solid sugar is dissolved in a glass of liquid water, what phase or phases are present after mixing:
(a)Liquid only
(b)Still solid and liquid
(c)Solid only
(d)None of these

Question 13.Volume of a gas at a particular temperature and on atmospheric pressure is 200 ml. Keeping the temperature constant if pressure is increased to 5 atmosphere, then volume of the gas will be:
(a)100 ml
(b)40 ml
(c)200 ml
(d)205 ml

Question 14.Which of the following statements best explains why a closed balloon filled with helium gas rises in air?
(a)Helium is a mono-atomic gas, whereas nearly all the molecules that make up air, such as nitrogen and oxygen, are diatomic.
(b)The average speed of helium atoms is higher than the average speeds of air molecules, and the higher speed of collisions with the balloon walls propels the balloon upward.
(c)Because the helium atoms are of lower mass than the average is molecules, the helium gas is less dense than air. The balloon thus weighs less than the air displaces by its volume.
(d)Because helium has a lower molar mass than the average air molecules, the helium atoms are in faster motion. This means that the temperature. Hot gases tend to rise.

Question 15.Non- reacting gases have a tendency to mix with each other. This phenomenon is known as:
(a)Chemical reaction
(b)Diffusion
(c)Effusion
(d)Explosion

[C] LONG ANSWER TYPE:

Question 1. Give reasons-
a. The water kept in earthen pot (matka) remain cool?
b. Smell of perfume is spread all over the room.
c. If we put acetone or spirit in our palm feel cool.
d. Gases fill their container completely.
e. An iron almirah is said to be solid.

Question 2.Write the characteristics of particle of matter? Describe any two of it with example and activity?

Question 3.Differentiate between-
a. Boiling point and melting point
b. Diffusion in solid and diffusion in liquid
c. Boiling and evaporation

Question 4.A glass tumbler containing hot water is kept in the freezer compartment of a refrigerator (temperature < 00C). If you could measure the temperature of the content of the tumbler, which of the following graphs would correctly represent the change in its temperature as a function of time.

WEEK 3

Topics:

1. Students will solve the WORKSHEET ON LESSON: CELL

2. Students will write the Experiment 5 from the Lab Manual.

Worksheet 02

Structural & functional unit of life: cell

1. ‘X’ accidentally placed her hand over a flame & immediately pulled it back. She felt the sensation of heat & reacted due to the action of:

a.                   Blood cells                                                       c. Skin surface

b.                  Nerve cells                                                       d. Nucleus

2.                   Which of the following is not a cell?

a.                   Erythrocytes                                                                      c. Bacterium

b.                  Spermatozoa                                                                     d. Virus

3.                   Under a microscope john observes a cell that has a cell wall but no distinct nucleus. The cell he observed is:

a.                   Plant cell                                                                    c. Animal cell

b.                  Nerve cell                                                                    d. Bacterial cell

4.                   Distinguish between cell wall & cell membrane.

5.                   Name the parts of the nucleus & state its function.

6.                   What is a gene?

7.                   Give 2 examples of prokaryotes.

8.                   Is an elephant cell longer than that of a rat? Why?

9.                   What do you mean by a selectively permeable membrane?

10.               A cell placed in a solution swells up. What kind of solution is it? Why does it happen?

11.               What would happen if there is no Golgi apparatus in the cell?

12.               How do substances like carbon dioxide & oxygen move in & out of the cell?

13.               Differentiate between chromatin & chromosomes.

14.               Differentiate between smooth & rough endoplasmic reticulum.

15.               Write 2 precautions to be taken while preparing a slide of onion peel.

16.               Draw the diagram of prokaryotic & eukaryotic cells.

17.               Differentiate between chloroplast, chromoplast & leucoplast.

Experiment [II]: This is the experiment 5 of the lab manual i.e. Slide of onion peel and cheek cells

https://youtu.be/Twp381zHuTE  (Slide of onion peel and human cheek cells)

WEEK 4

 Topics: 

1. Students will solve the WORKSHEET ON LESSON: TISSUES

WORKSHEET 03

 TISSUES

CATEGORY A

Q1) How are permanent tissues different from meristematic tissues in plants?

Q2) Name the dead elements of phloem.

Q3) What is the nature of cell wall in collenchymatous cells?

Q4) Draw a neat labelled diagram to show the location of meristematic tissue. Mention the function of each meristematic tissue.

Q5) Where are smooth muscle tissues located in the body?

Q6) What is the role of epidermis in plants?

Q7) Give three differences between Parenchyma and Sclerenchyma.

Q8)  Which tissue stores fat?

Q9) Give one example of connective tissue in which the matrix is solid.

Q10) What are neurons? Where are they found? What function do they perform in the body of an organism?

Q11) Which type of muscles are found in the

a.                     Iris of the eye

b.                   Oesophagus

c.                    Heart

Q12) Which structure protects the plant body against invasion by parasites?

Q13) Draw a neat labelled diagram of a neuron.

What is the term given to the gap between two nerve cells?

Q14) What is differentiation?

Q15) How are plant tissues different from animal tissues?

CATEGORY B

Q1)The lawn grass are mowed often. How do they regenerate and fill the lawn again and again?

Q2)The trees have thick trunk. How is it produced?

Q3)What is the unique characteristic feature of the meristem?

Q4)What is the main function of  vascular tissues in plants?

Q5) Why are smooth muscles called involuntary muscles? In what way are they different from striated muscles with respect to number of nuclei?

Q6) Write the differences between simple and complex tissues. Give one example of each.

 Q7) List the constituents of the xylem. What would happen if the xylem if the xylem of root of a plant is blocked?

Q8) List the constituents of the phloem. What will happen if the phloem at the base of a branch is removed?  

Q9) Differentiate between:

a.                    Blood and Bone

b.                   Tendons and Ligaments

c.                    Bone and Cartilage  

Q10) How does cork act as a protective tissue?

Q11) Diagrammatically differentiate between the three types of muscular tissues.

Q12) Name the tissue present in the respiratory tract. What is its role?

Q13) Why is connective tissue called so?

CATEGORY C

Q1) Why do we get a crunchy and granular feeling, when we chew a pear fruit?

Q2) How are branches of a tree move and bend freely in high wind velocity?

Q3) Why is it difficult to pull out the husk of coconut tree?

Q4) How is water hyacinth plant able to float on water? 

Q5) Animals and fish of colder regions have a thicker layer of subcutaneous fat. Why?

Q6) What will you observe if a potted plant is covered with a glass jar for some time? Explain your observation.

Q7) If the tip of sugarcane plant is removed, even then it continues to grow. It is due to the presence of

a.                    Cambium

b.                   Apical meristem

c.                    Lateral meristem

d.                   Intercalary meristem

Q8) A person met with an accident in which two long bones of hand were dislocated. Which of the following may be the possible reason?

a.                     Tendon break

b.                   Break of skeletal muscle

c.                    Ligament break

d.                   Areolar tissue break

WEEK 5

Topics:

1. Students will write the Experiment 6 from the Lab Manual.

2. Students will watch the videos (link provided in the Blog) to revise the Lesson: Is Matter Around Us Pure? (Done till 22 May)

Experiment [III] : This is the experiment 6 of the lab manual i.e. Plant and Animal Tissues

https://youtu.be/I14PHbVXno4 (Plant and Animal Tissues)

VIDEOS TO BE WATCHED AS PART OF REVISION OF THE LESSON: IS MATTER AROUND US PURE? (DONE TILL 22 MAY)

Mixtures and compounds

https://youtu.be/C2RqAE0wbqk (Mixtures and compounds)

 Separation of components of a mixture

https://youtu.be/tQdvPTPlU1M (Separation of components of a mixture)

Types of reactions and changes

https://youtu.be/62-LJYKKOWs  (Types of reactions and changes)

Solutions, Colloids and suspensions

https://youtu.be/-eRc38dXfWE (Solutions, Colloids, and suspensions)