Control: is the power of restrain and regulation by which something can be started, slowed down, expedited or stopped. Coordination: (L. co-joint, ordinates-regulated) is orderly or harmonious working of different but inter-related parts so as to perform one or more activities very smoothly. Need for control and coordination in an organism: The body of a multicellular organism consists of a number of components and sub-components; each specialized to perform a particular function. However, all the components are not required to function all the time at the same speed. A system of controls is required to function all the time at the same speed. A system of controls is required to allow them to perform or not to perform, slow down or speed up their working. Further, most activities require the simultaneous or sequential functioning of a number of parts, stopping some and stimulation others. During feeding, eyes locate the food, nose registers its smell, hands pick up the food and take it to mouth, mouth opens to receive the food, teeth and muscles take part in its mastication and saliva moistens it. Tongue perceives its taste. It moves the food below the teeth. Later it pushes the crushed food into pharynx. All this is possible only through a system of coordination. CBSE_NCERT Chapter 7 Control and Coordination Biology X Control and Co-ordination Study Notes Download File X Control and Co-ordination Solve Questions Download File
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CBSE Class 9th (IX) chapter 06 Tissues [Biology term-01] Board Guess Questions with solution Q. Name the element(s) of xylem which (i) help in transport of water and minerals, (ii) stores food, and (iii) provides mechanical support
Ans: (i) tracheids and vessels (ii) xylem parenchyma (iii) xylem fibres
Q. (a) State the constituents of phloem ? (b) How does cork act as a protective tissue ?
Answer: (a) Constituents of phloem are : (1) Sieve tubes (2) Companian cells (3) Phloem fibres (4) Phloem parenchyma
(b) Cells of cork are dead and compactly arranged without intercellular space and hence do not allow entry of pathogens. Moreover they have a chemical called suberin in their walls that makes them impervious to gases and water.
Q. Which tissue makes up the husk of coconut? Ans: The husk of a coconut is made up of sclerenchyma tissue.
Q. Name the tissue responsible for movement in our body. Ans: Themuscular tissue is responsible for movement in our body
Q. Give one reason for the following statements : (a) The blood is called connective tissue. (b) Muscles are able to contract and relax to bring about movements. (c) Muscles of heart are called involuntary muscles.
Ans: (a) Blood flows to transport gases, digested food, hormones and waste materials to different parts of the body. (b) Muscles contain special proteins called contractile proteins, which contract and relax to cause movements. (c) Muscles of heart show rhythmic contraction and relaxation throughout life without getting fatigued.
Q. List any two differences between striated and cardiac muscle with respect to their structure and location. Ans: Striated muscle 1. The cells striated muscles are long, cylindrical unbranched and multinucleated. 2. Striated muscles are present in our limbs and join the bones. Cardiac muscle 1. The cells of cardiac muscles are cylindrical, branched and uninucleated. 2. These muscles are present in the heart.
Q. (i) Draw a labelled diagram of longitudinal section of parenchyma. (ii) Write three functions of parenchyma cells.
Ans: Figure No. 1.4 NCERT (a) It provides support to plants. (b) It also stores food (c) In aquatic plants parenchyma cells filled with air helps in buoyancy. Q. Mention the type of tissue which (a) enables the plant to transport food material from leaves to other parts of its body. (b) helps in the growth of girth of the stem ? (c) helps in the transport of water from the root to other parts ? (d) provides support to plants and also stores food ? Ans: (a) Phloem (b) Cambium, or lateral meristem (c) Xylem (d) Parenchyma
Q. (a) Name the two types of complex tissues. (b) Draw a neat diagram of the section of the tissue that is responsible for the translocation of food from the leaves to the different parts of the plant ?
Ans: Xylem and Phloem (a) Dia. On page 73 fig. 6.7of NCERT.
Q. Write one important functional difference between Striated and Smooth muscle tissue and draw a labeled diagram of the muscle tissue that shows rhythmic contraction and relaxation throughout life.
Ans: Striated muscles â This tissue is responsible for voluntary actions like movement of limbs in our body. Smooth muscles â This tissue is responsible for involuntary actions like movement of food in alimentary canal in our body, also found in the iris of the eye, ureters and bronchi. (any one) I Cardiac muscle tissue dia. (c) page.77 fig. 6.11
Q. Where is apical meristem found? Ans: Apical meristem is present at the growing tips of stems and roots. Their main function is to initiate growth in new cells of seedlings, at the tip of roots, and shoots.
Q. What are the functions of areolar tissue? Answer: Functions of areolar tissue: (i) It helps in supporting internal organs. (ii) It helps in repairing the tissues of the skin and muscles.
Q1 Name the following: 1. Pigeon pea is a good source of ________.(protein) 2. Berseem is an important _________. (fodder) 3. _________ are rich in vitamins.(vegetable/fruits) 4. _________ Crops are grown in winters. (rabi) Q2 List some important traits in improved crops. Ans. Some of the important traits in improved crops are: 1. high yield 2. improved quality 3. high resistance 4. wider adaptability 5. desirable agronomic traits Q3 Why is excess use of fertilizers detrimental for environment? Ans.Excess use of fertilizers has many bad effects like: 1. salination of soil 2. eutrophication 3. excess minerals in crop plants Q4 Give one word: 1. growing of wheat and groundnut in the same field .(mixed cropping) 2. xanthium and parthenium are called.(weeds) 3. causal organism of any disease is called.(pathogen) 4. Farming without the use of chemicals. (organic farming) 5. planting of soyabean and maize in alternate rows in the same field .(intercropping) Q5 Define hybridization. Ans.Crossing of two individuals with different useful traits in order to bring them together in a progeny.The new organism thus obtained is called a hybrid and has better characters as compared to either of the parents. Q6 What is vermicompost? Ans.It is a manure rich in pulverized organic matter and worm castings.It is prepared using earthworms. It is a quicker method of composting. Earth worms are seperarted and the Compost is ready for use. Q7 Explain the term biofertilizers. Ans.Living organisms like nitrogen fixing bacteria, blue green algae and minerals solubilising bacteria are called biofertilizers. Eg. Blue green bacteria,( nostoc, anabaena etc.) Q8 Name 2 varieties of Indian fish Ans.Fresh water: catla, rohuMarine fish: hilsa , sardine Q9 Name 2 indigenous and 2 exotic breeds of poultry. Ans. Indigenous: aseel, basra Exotic: rhode Island Red, white leghorn Q10 What are advantages of composite fish culture? Ans.Composite fish culture is the practice of growing 5 to 6 species of fish in the same Fish tank. It includes the use of surface feeders, middle zone feeder and bottom Feeder. It has the following advantages: 1. no competition for food or space. 2. proper utilization of food 3. fish yield is high. Q11 Name two exotic breeds of cows 1. holstein- friesian 2. brown swiss Q12 Define broiler Ans.Chickens which are about 7-8 weeks of age and are raised for meat. Q13 What is roughage? Ans. It’s a course and fibrous substance which has low nutrient content .e.g. fodder,hay and straw. Q14 Name some symptoms of sick animals: Ans,If an animal is sick, it shows following symptoms: 1. inactive 2. look tired 3. remain isolated 4. low yield Q15 Define animal husbandry. Ans Branch of agriculture which deals with the feeding, shelter, health and breeding domestic animals is called animal husbandry. Q16. Define Mixed cropping Ans. The technique of growing two or more different crops together in same field is Called mixed cropping. Eg. Ragi and gram, maize and urad bean etc. Q17. Define intercropping. Ans. Growing 2 or more crops simultaneously in different strips in a same field in definite row pattern is called intercropping. Eg. Soyabean,maize, cow pea. Q18. Define crop rotation Ans. Growing different crops on the same piece of land in a pre planned succession Is called crop rotation. Eg rice- wheat. Q19. What is biological pest control? Ans. In this method, some birds, insects etc are deliberately put in the affected field. They destoy the pests in the field. Q20. What are weeds and why are they unwanted? Ans. The plants which grow along with the cultivated crop are called weeds. They are Unwanted as they compete with the main crop for nutrient, space, sunlight etc. Q21. What are layers? Ans. Hens raised for egg production are called layers. They start laying eggs at the age of 20 weeks. Q22. What is mariculture? Ans. Culture of marine fin fish,shell fish and sea weeds is called mariculture. Mariculture is growing rapidly as the demand for fish is increasing while the Stock is declining due to excessive exploitation from sea. Q23. Why are Italian bee varieties preferred? They are preferred as: a)They are gentle in nature. b) They have good honey collection capacity. c) They have less swarming activity. Q24. What are concentrates? Ans. The concentrates are rich in nutrients with very little fibrous or cellulose matter. They are rich in carbohydrates, proteins, fats, minerals and vitamins. Eg oil cakes, grains etc. Q25. What is culture fishery? Ans. It is cultivating , rearing and harvesting of fish. It is also called fish farming. Or pisciculture. The growing of various types of aquatic organisms in water bodies Is called aquaculture. 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 Searches related to Class 9 - Improvement in food resources notes and test paper
improvement in food resources class 9 notes pdf improvement in food resources wikipedia improvement in food resources class 9 answers improvement in food resources class 9 ppt improvement in food resources class 9 cbse NCERT Class 9 Science Improvement In Food Resources First Term > Improvement in Food Resources Chapter – Rational Numbers Contents : Introduction Properties of Rational Numbers Representation of Rational Numbers on the Number line. Rational Numbers between two rational numbers. Learning Objectives: The students learn to represent rational numbers on the number line. They learn to verify various properties taking different values.
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