CLASS 9- BIOLOGY-Solved Test Paper: THE FUNDAMENTAL UNIT OF LIFE

Fundamental Unit Of Life : Class IX Biology : Fill in the Blanks

1. A -------------is the basic structural and functional unit of all life forms.

Ans: cell

2. Study of structure and composition of cell is called as ------------

Ans: “Cytology”.

3. Cell was first observed by “Robert Hooke” in a dead cork slice in the year 1665. He described about this in his book -----------------

Ans: “Micrographic”.

3. The word cell was derived from a Greek word ---------- which means small room.

Ans: “Cellulae”

4. First living cell was discovered by -------------

Ans: A.V. Leeuwenhoek

5. The term protoplasm was coined ---------- in 1839.

Ans: by purkinje

6. Protoplasm was discovered by ------------ and named as sarcode.

Ans: “Felix Dujardin”

7. --------- is an aggregate of various chemicals such as water, ions, salts and other organic

molecules like proteins, carbohydrates, fats, nucleic acids, vitamins etc.

Ans: Protoplasm

8. Two biologists, “Schleiden and Schwann” gave the “Cell theory” which was later on expanded by -------------

Ans: “Rudolf Virchow ”.

9. ---------- are the exceptions of cell theory.

Ans: Viruses

10. --------------- cell are primitive and incomplete and have less developed nucleus without nuclear membrane and nucleolus. e.g. Bacteria

Ans. Prokaryotic cells:

2. What is the advantage of multicellularity over unicellularity?

Ans- Division of labor.

3. What are the chromosomes made up of?

Ans- DNA & proteins

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

Ans- It is a hypotonic sol ution & water enters the cell by endosmosis causing the cell to swell up.

5. Why are lysosomes known as “suicidal bags”?

Ans- They secrete powerful digestive enzymes to digest the worn out and damaged cell organelles as well as the cell itself when it loses its functional ability.

6.Why is the nucleus so significant in a cell?

Ans- Nucleus has the following important functions-

(i) It controls all cell activities

(ii) It contains hereditary material that transmits hereditary information from one generation to the next

(iii) It helps in cell division

7. Differentiate between plant and animal cells.

1. PLANT CELL

1- Surrounded by two membranes- cell wall & cell membrane.

2- Possess three types of plastids chloroplasts, chromoplasts, leucoplasts.

3- Do not possess lysosomes.

4- Nucleus is towards the periphery.

5- Centrioles are absent

ANIMAL CELL

1- Surrounded only by cell / plasma membrane.

2-Do not possess plastids.

3-Possess lysosomes

4 -Nucleus is in the center ..

5-Centrioles present & help in cell division.

8. Give the major functions of the following cell organelles-

(a) Endoplasmic reticulum RER-- Synthesis of proteins as it has ribosomes attached to it

SER- Synthesis of lipids required for making cell membrane

(b) Golgi apparatus-----------Storage & packaging of various products.

(d) Ribosomes ---Protein synthesis

(e) Golgi ApparatusStorage & packaging of various products.

(f) LysosomesDigestion of worn out & damaged organelles

Related Post: 9th Biology You may like to Read

Assignments for Fundamental unit of life: Class –IX Biology

CLASS 9- BIOLOGY-Solved Test Paper: Fundamental unit of life
CBSE MCQ’s: IX Biology - "The Cell & Fundamental Unit of life"

Biology IX-M C Q Cell- the fundamental unit of life

Notes IX Biology: Cell- the fundamental unit of life

IX Ch: Tissues in Plants and Animals Biology Notes

CBSE 9th Biology - Ch:06-Tissues Solved Questions

IX Biology - Improvement in Food Resources Solved Questions

Topic: Improvement in food resources: Revision assignment

Comments

CBSE ADDA :By Jsunil Sir : Your Ultimate Destination for CBSE Exam Preparation and Academic Insights

Class 10 Chapter 02 Acid Bases and Salts NCERT Activity Explanation

NCERT Activity Chapter 02 Acid Bases and Salt Class 10 Chemistry Activity 2.1 Indicator Acid Base Red litmus No Change Blue Blue Litmus Red No change Phenolphthalein Colourless Pink Methyl Orange Pink Yellow Indictors are substance which change colour in acidic or basic media. Activity 2.2 There are some substances whose odour changes in in acidic or basic media. These are called olfactory indicators. Like onion vanilla, onion and clove. These changes smell in basic solution. Activity 2.3 Take about 5 mL of dilute sulphuric acid in a test tube and add few pieces of zinc granules to it. => You will observe bubbles of hydrogen gas on the surface of zinc granules. Zn + H2SO4 --> ZnSO4 + H2 => Pass the Hydrogen gas through the soap solution. Bubbles formed in the soap solution as Hydrogen gas it does not get dissolved in it

CBSE I NCERT 10th Numerical Problem solved Reflection and reflection of light

Q. 1. A concave mirror of focal length 20cm is placed 50 cm from a wall. How far from the wall an object be placed to form its real image on the wall? Solution: V= -50 cm F= -20cm From mirror formula 1/u = 1/f – 1/v = -1/20+ 1/50 = - 3/100 U = - 33.3 cm Therefore, the distance of the object from the wall x = 50 – u X = 50 – 33.3 = 16.7 cm. Q.2. An object is placed at a distance of 40cm from a concave mirror of focal length 15cm. If the object is displaced through a distance of 20 cm towards the mirror, By how much distance is the image displaced? Answer: Here f = - 15 cm, u = - 40 cm Now 1/f = 1/u + 1/v Then 1/v = 1/f – 1/u Or V= uf/u-f =( - 40 x -15)/25 = -24 cm Then object is displaced towards the mirror let u1 be the distance object from the Mirror in its new position. Then u1 = -(40-20) = -20cm If the image is formed at a distance u1 from the mirror then v1 = u1f/u1-f = -20X-15/-20+15 = -60 cm. = - 20 x-15/-20+15 = -60 cm. Therefor

Class 10 Metal and Non MetalsChapter 03 NCERT Activity Solutions

X Class 10 NCERT Activity Explanation Class 10 Metals and Non Metals Activity 3.1 Page No. 37 Take samples of iron, copper, aluminium and magnesium. Note the appearance of each sample. They have a shining surface. Clean the surface of each sample by rubbing them with sand paper and note their appearance again. They become more shiny. => Freshly cut Metal have shiny surface Activity 3.2 Page No. 37 Take small pieces of iron, copper, aluminium, and magnesium. Try to cut these metals with a sharp knife and note your observations. They are very hard to cut. Hold a piece of sodium metal with a pair of tongs and try to cut it with a knife. Sodium can be cut easily with knife. Hence K and Na are soft metal cut with knife Activity 3.3 Page No. 38 Take pieces of iron, zinc, lead and copper try to strike it four or five times with a hammer. These metals are beaten into thin sheet on hammering. This property of metal is called malleability and metals are called malleable. Activity 3.4 Page

Living science ratna sagar class 6 solutions

Ratna sagar living science 6 answers by jsunil. Class6 Living science solution Term-1 Living Science Solution chapter-1 Source of food Download File Living Science Solution chapter-2 Component of food Download File Living Science Solution chapter-3 Fibre to fabric Download File Living Science Sol ch-4 Sorting of material into group Download File Living Science Soln ch-5 Separation of substance Download File Living Science Solution chapter-6 Change around Us Download File Living Science Solution ch-7 Living and Non Living Download File Living Science Solution ch-8 Getting to Know Plants Download File Living Science Sol ch-9 The Body and Its movements Download File Visit given link for full answer Class6 Living science solution Term-II

Electricity numerical for class 10 CBSE Trend Setter 50 Problems

1. The current passing through a room heater has been halved. What will happen to the heat produced by it? 2. An electric iron of resistance 20 ohm draws a current of 5 amperes. Calculate the heat produced in 30 seconds. 3. An electric heater of resistance 8 ohm takes a current of 15 A from the mains supply line. Calculate the rate at which heat is developed in the heater. 4. A resistance of 40 ohms and one of 60 ohms are arranged in series across 220 volt supply. Find the heat in joules produced by this combination in half a minute. 5. A resistance of 25 ohm is connected to a 12 V battery. Calculate the heat energy in joules generated per minute. 6. 100 joules of heat is produced per second in a 4 ohm resistor. What is the potential difference across the resistor? 7. An electric iron is connected to the mains power supply of 220 V. When the electric iron is adjusted at minimum heating’ it consumes a power of 360 W but at ‘maximum heating’ it takes a power of 840 W. Ca

CBSE ADDA

Search This Blog