Friday, June 29, 2012

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Saturday, June 16, 2012

Assignments for First Term Class –IX Biology

Fundamental unit of life : Assignments SA-1–IX Biology
Q1 Write the main function of leucoplast.
Q2 What is the function of SER in liver cells of vertebrates?
Q3 Why the RER appears rough?
Q4 Why viruses are not supposed to be living?
Q5 What is a nucleoid?
Q6 Why dry raisins placed in water swell up?
Q7 In which part of a plant chromoplasts are found?
Q8 Where are genes located?
Q9 What will happen if we keep a plant cell or animal cell in a (i) Hypotonic solution (ii) Hypertonic solution iii) Isotonic solution.
Q10 Explain the importance of osmosis for living beings?
Q11 Give the historical development of cell theory.
Q12 Who coined the term “cell “ and how?
Q13 Write the contribution of (a) Robert Hooke, (b) Leeuwenhoek (c) Robert Brown
Q14 Draw a large diagram of an animal cell as seen through aan electron microscope. Label the parts that carry on the function of Respiration, secretion, protein synthesis, transport of material.
Q15 Which substance is responsible for transfer of characters from one generation to another?
Topic – Tissues Assignments SA-1–IX Biology
Q1 Which cells can contract and relax?
Q2 Name the substance that makes cork compact.
Q3 What are root hair?
Q4 What is transpiration?
Q5 What is aerenchyma?
Q6 Name the parenchyma tissue which has chlorophyll.
Q7 Where is meristemetic tissue found in plants?
Q8 What is the difference between bone and cartilage?
Q9 Where are tendons and ligaments found?
Q10 Describe the functions of xylem. Write the function of each component.
Q11 What are complex tissues? Write their different kinds.
Q12 What are cork cells?
Q13 What are stomata? Write about their structure and function?
Q14 What are protective tissues?
Q15 Write the characteristics and functions of collenchyma.
Q16. On the basis of structural and functional difference, write the characteristics of plant and animal tissues.
Topic - Improvement in food resources :Assignments SA-1–IX Biology
Q1. What are milch animals?
Q2. Name two cattle breeds which show excellent resistance of diseases.
Q3. Mention two signs of a healthy animal.
Q4. Name any two local varieties of bees that are used for commercial honey production in India.
Q5. How is the use of manures beneficial for our environment?
Q6. List the important preventive measures to control weeds.
Q7. What are the advantages of bee keeping?
Q8. What are the main elements of animal husbandry?
Q9. Give the merits and demerits of fish culture?
Q10. Write the modes by which insects affect the crop yield.
Q11. Why is excess use of fertilizers detrimental for the environment?
Q12. Define the terms hybridization and photoperiod.
Q13. Differentiate between compost and vermicompost?
Q14. What is green manure?
Q15. What do you understand by organic farming?
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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- 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
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.
(c) Mitochondria------Production of ATP(Adenosine Triphosphate) which is a source of energy.
(d) Ribosomes ---Protein synthesis
(e) Golgi ApparatusStorage & packaging of various products.
(f) LysosomesDigestion of worn out & damaged organelles

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9th – Biology :Topic: Improvement in food resources:Revision assignment

Knowledge Binder
A. Very short answer questions:
Q1. Define the following terms:

a) Photoperiod   b) green manure   c) organic farming d) concentrates e) roughage

Q2. Mention one advantage and one disadvantage of green revolution.

Q3. What nutrients do we get from: cereals and pulses?

Q4. How many nutrients are required in lesser quantities and what are they commonly called?

Q5. Why even excess application of manure does not cause pollution?

Q6. Give one disadvantage of fertilizer.

Q7. Name one crop which can tolerate water logging in field and one which cannot?

Q8. What happens when a matured wheat crop is irrigated?

Q9. A farmer grows gram crop between two cereal crops. What agricultural practice is being followed?

Q10. Give one word:

1) A toxic substance effective against insects.

2) A fungal disease of wheat crop      3) A common weed

4) A weedicide     5) One natural insecticide

Q11. Name one HYV of cow and one of buffalo.

Q12. Name two exotic varieties of cow.

Q13. What are the indications for diseased cattle?

Q14. Why special care of broiler is taken?

Q15. During heavy rains in a village, the rain water carried excess of nitrogen into the river. What can be the 
consequence of this process.?

Q16. Name two indigenous breeds of poultry.

Q17. Define inland fishery.

Q18. How is pisciculture different from apiculture?

Q19. Name two fresh water fishes.

Q20.What two products do we obtain from honey bees?

B. Short answer questions:

Q1. How are HYV of poultry advantageous over local breeds?

Q2. What is pasturage and how is it related to honey production?

Q3. How will you distinguish between capture fishery, inland fishery and aquaculture?

Q4. Name the Italian bee variety used for honey production and mention two reasons for why its preferred 
over other varieties?

Q5. Define composite fish culture and mention its advantage.

Q6. How are broilers and layers different from each other?

Q7. Mention four main features of a good cattle shelter.

Q8. Pick the odd one out and give reason:

a) Gir ,sahiwal, red sindhi, jersey

b) Aseel, basra, chattisgarh, white leghorn.

Q9. Suppose you are in charge of a grain store. Mention two indications to find out the presence of pests in 
the godown.

Q10. Give reason:

a) legumes are desirable during crop rotation

b) Excessive irrigation of crops should be avoided.

Q11. Classify the various plant nutrients according to their sources.

Q12. Crop variety improvement is a must. Justify by giving three reasons.

Q13.How is a compost different from vermicompost?

Q14. Pick the odd one out with reason:

a) mullets, pearl spots, oyster, bhetki

b) sardine, rohu, Bombay duck, tuna

Q15. Name the surface , middle zone and bottom feeders in  composite fish culture.

C. Long answer questions:

Q1. Green revolution is like two faces of a coin . Explain in detail.

Q2. Write a note on prevention of animal diseases.

Q3.Mention the various preventive measures to be taken in account during grain storage.

Q4. Biological control methods should be preferred for protecting crops. Why?

Q5. Compare mixed and intercropping . also mention their advantages.

Download Solved Paper And Notes   Download

IX Biology : Improvement in Food Resources [excel in Exam]

CBSE solved ,unsolved test papers,Notes, Assignments and Guess Papers  : First Term:  Improvement in Food Resources. Plant and animal breeding and selection for quality improvement and management; use of fertilizers, manures; protection from pests and diseases; organic farming.

IX- Improvement in Food Res Solved Questions IX- Imp. Food Resources:Revision assignment IX- Food Resources Solved Questions Bank                 Visit to Download files

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

Q1. Which tissue protects the entire body?

Answer: Epithelial tissue

Q2.Give one example each of: 

1. Squamous epithelium (simple) - cheek cells
2. Columnar epithelium - intestine

Q3.Give one example of connective tissue in which matrix is solid?

Answer : Bone 

Q4. Name the following: 

1. Multinucleate muscle fibre: - skeletal muscle fibre
2. Spindle shaped muscle fibre: - smooth muscle fibre
3. Tissue which stores fats: - adipose
4. Process of neuron, which carries impulse: -axon

Q5.Name one structure in your body, which bears ciliated epithelium.

Answer: Respiratory tract

Q6.What is aerenchyma?

Ans: It is a specialized parenchyma found in aquatic plants which consists of network of small cells that enclose air cavities.

Q7.What is the difference between simple plant tissue and simple animal tissue?

1. Consists of same type of Cells.       Consists of one or more types of Cells.

2. Arrangement varies.                         Arranged in a single layer.

Q8.What is the utility of tissues in multicellular organisms?

Answer: 1.Division of labour 2. Higher organization 3. Higher survival

Q9.What is a synapse

Answer: Junction between two neurons.

Q10.Where is apical meristem found?

Answer: Root and stem tips

Q11. Identify the type of tissue in the following?

 1. Skin - epithelial 
 2. Bark - cork 
 3. Bone - connective
4. Lining of kidney tubules - epithelial 
 5. Vascular bundle - xylem and phloem

Q12. What is the role of epidermis?

Answer: a. Protection 
 b. Regulates transpiration 
 c. Exchange of gases

Q13.What will happen if apical meristem is damaged?

Ans:Growth in length will stop.

Q14.What are the components of phloem?

1. Phloem parenchyma 2. Phloem fibres 3. Sieve tubes 4. Companion cells

Q15.Name all simple plant tissues?

Ans:1. Parenchyma 2. Collenchyma 3. Sclerenchyma

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