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201.

Question : What happens when a normal animal cell is kept in hypotonic solution ?(A) It swells up.(B) It shows plasmolysis(C) It remains unaffected.(D) It gets shrunk

Answer»

It SWELLS up.
It shows plasmolysis
It REMAINS unaffected.
It gets SHRUNK
Discussion
202.

Question : What happens to the force between two objects if i) The mass of one object is doubled ii) The distance between the objects is doubled and tripled. iii) The masses of both objects are doubled ?

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SOLUTION :(i) The mass of one object is doubled ?
From universal law of force exerted on an object of mass m by earth is GIVEN by
`F=G(Mxxm)/(r^(2))`......................Equation 1
When mass of the object say m is doubled than
`F^(1)=G (Mxx2m)/(r^(2))=2F`
So as the mass of any one of the object is doubled the force is also doubled.
(ii) The distance between the objects is doubled and tripled
The force F is inversal proportional to the distance between the objects. So if the distance between two objects is DOUBLE then the GRAVITATIONAL force of attraction between them is reduced to one fourth of its original value. Similarly if the distance between two objects is tripled, then the gravitational force of attraction becomes one ninth of its original value.
(iii) The masses of both objects is doubled ?
Again from universal law of attraction from equation 1 from F is directly proportional to the product of both the masses. So if both the masses are doubled then the gravitational force of attraction becomes FOUR times the original value.
Discussion
203.

Question : What factors may be responsible for losses of grains during storage?

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SOLUTION :1. Factors RESPONSIBLE for losses of grains ar two types viz biotic factors and ABIOTIC factors.
2. Biotic factors are INSECTS, rodents, fungi, mites and bacteria.
3. Abiotic factors are inappropriate moisture, humidity and temperatures in the place of storage.
Discussion
204.

Question : What factors are required for the absorption of Vitamin D from the food by the body ?

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Solution :The factor that regulates the absorption of VITAMIN D is the presence of dietary fat (Egg , LIVER , Dairy products , Fish , ECT ) . When our body absorbs this fat , it also absorbs the dissolved vitamin D . When the SUN rays falls on the SKIN , the fat is converted in to Vitamin D .
Discussion
205.

Question : What does the manure increase in th sand soils?

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Waterholding capacity
Gas (AIR) HOLDING capacity
Decantation capacity
All the given

Answer :A::C::D
Discussion
206.

Question : What does the figure depict ? Lable A, B and C

Answer»
Discussion
207.

Question : What do you think could be the reason forthese differences ? What do you think would be the effect of these differences on the generalhealth of the population ?

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SOLUTION : As COMPARED to chronic DISEASES, in generalpopulation, acute diseases are seen to be in more numbers. Various infective diseases and epidemics make people acutely infected. But with proper REST and appropriate medicines, they are cured completely. Chronic diseases on the other hand occur in less numbers.
Discussion
208.

Question : What do you mean by Tidal volume?

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ANSWER :Tidal volume is the volume of air we breathe in and out during a NORMAL BREATHING.
Discussion
209.

Question : What do you mean by the term coelomate animals ? Give two examples.

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ANSWER :N/a
Discussion
210.

Question : What do you mean by systole?

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Answer :Constraction of the CHAMBERS of the heart is termed as systole. During this PHASE blood FLOWS from ATRIA to ventricles and from ventricles to outside.
Discussion
211.

Question : What do you mean by systemic circulation?

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Answer :The circulation that starts from the left venbtricle and ENDS in the right ATRIUM after calculating THROUGHOUT the whole BODY is called SYSTEMIC circulation.
Discussion
212.

Question : What do you mean by Peristalsis ?

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Answer :Peristalsis is the wave like MOVEMENT of the OESOPHAGUS; STOMACH and INTESTINES.
Discussion
213.

Question : What do you mean by health ?

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ANSWER :HEALTH is the state of being well ENOUGH to function well physically, mentally and SOCIALLY.
Discussion
214.

Question : What do you mean by facilitated diffusion ?

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Answer :DIFFUSION of certain molecules with the HELP of protein molecules in the CELL membrane is CALLED facilitated diffusion.
Discussion
215.

Question : What do you mean by digestion ?

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Answer :DIGESTION is the process of conversion of COMPLEX food materials into SIMPLE absorbable forms.
Discussion
216.

Question : What do you mean by eutely ?

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ANSWER :It is the phenomenon of having a FIXED, genetically constant number of CELLS in an ORGANISM.
Discussion
217.

Question : What do you mean by bulk transport of materials ? Name two special processes involved for such transfer across plasma membrane ?

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Solution :Bulk transport of MATERIALS involve special processes to transport macro-molecules, lipid DROPLETS and solid food particles in LARGE amounts across the plasma MEMBRANE. Special processes are endocytosis and EXOCYTOSIS.
Discussion
218.

Question : What do you mean by cellular respiration?

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Answer :The process by which energy is released from GLUCOSE in CELLS is CALLED CELLULAR RESPIRATION.
Discussion
219.

Question : What do we get from cereals, pulses, fruits and vegetables?

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Solution :From cerreals we GET carbohydrates. Carbohydrates GIVE energy to the BODY. It ALSO forms the bulk of the diet. Pulses provide us with the proteins. Proteins arebody building nutrients. They also help in managing wear and tear of the body by providing repairs. Fats are high energy nutrients. They also provide us with heat. Fruits and vegetables provide us with vitamins adn minerals. Small quantities of carbohydrates adn proteins are also PROVIDED by fruits and vegetables. They also give roughage to the body.
Discussion
220.

Question : What crucial role does it play in the liver cells of vertebrates ?

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Solution :The SMOOTH endoplasmic reticulum PLAYS the crucial role of DETOXIFYING many poisons and DRUGS
Discussion
221.

Question : What could your family do to reduce the amountof solid waste generated during a day/week?

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Solution :For our family, we can REDUCE the biodegradableand wet garbage into manure by making vermicompost or compost, at home or in our societies. The other dry garbage can be sold to KABADIWALA, instead of throwing it anyhow. The plastic, paper, glass and metal scraps can be recycled and reused. We have to be vigilant aboul such separation of solid WASTE. E-waste materials should also be recycled in a proper way and should not be THROWN anyhow into the environment.
Discussion
222.

Question : What causes winds?

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Solution :An uneven heating of the Earth’s surface causes WINDS. On being heated, air becomes lighter and rises up. As a result, a region of LOW PRESSURE is created. Then, air from a high pressure region moves to a low pressure region, CAUSING wind.
Discussion
223.

Question : What causes TB ?

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Bacteria
Virus
Protozoan
Worms

Answer :A
Discussion
224.

Question : What causes Japanese encephalitis ? How it can be prevented ?

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Solution :(1) JAPANESE ENCEPHALITIS is caused by VIRUS which is transmitted by vector mosquito.
(2) The prevention of encephalitis is by eradicating mosquito population.
(3) ALSO care should be taken to avoid mosquito bite.
Discussion
225.

Question : What care should be taken at the time of applying fertilizers?

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Solution :FERTILIZERS should be applied carefully in TERMS of proper dose, time and observing pre and post -application PRECAUTIONS for their COMPLETE utilisation.
Discussion
226.

Question : What can be taken as an indicator of normal and healthy respiratory capacity?

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ANSWER :VITAL CAPACITY
Discussion
227.

Question : What asre the three clases in which the major groups of activities for improving crop yields are included?

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Solution :1. Crop variety IMPROVEMENT, 2. Crop production improvement 3. Crop protection MANAGEMENT.
Discussion
228.

Question : What are weeds? Give three examples of weeds.

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SOLUTION :Weeds are unwanted plants in the cultivated FIELD. The examples of weeds are XANTHIUM (gorkhroo), PARTHENIUM (gajar ghas), Cyperthus rotanlus (motha).
Discussion
229.

Question : What are weeds ? How do they affect crop plants ? Describe biological control of weeds

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ANSWER :N/a
Discussion
230.

Question : What are weeds? Give one example.

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SOLUTION :WEEDS are unwanted plants in thecultivatedfield.
Example: XANTHIUM (gokhroo), Parthenium (gajar GHAS), Cyperinus rotundus (motha).
Discussion
231.

Question : What are vectors ?

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SOLUTION :The organisms that carry pathogens from SICK person to ANOTHER HEALTHY person are called vectors, e.g. mosquito.
Discussion
232.

Question : What are uonwanted plant known as?

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Shrubs
Weeds
Herbs
Trees

Answer :D
Discussion
233.

Question : What are two types of wells? What is the difference between their functioning?

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Solution :WELLS are of two types NAMELY dug wells and tube wells. What is COLLECTED from water bearing strata in case of dug WELL. Tube wells can tap water from the deeper strata. HOWEVER, water can be lifted by pumps for irrigation in case of both dug and tube wells.
Discussion
234.

Question : What are the ways in which the insect pests attack the crop plants? Or List any three ways by which the insect pests attack the plants.

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Solution :The INSECT pests attack the CROP plants in the following three ways:
1. The plant parts like the root, stem and leaf are CUT off by them.
2. They suck the cell SAP from various parts of the plant.
3. some of them bore into stem and fruits.
The attack of insect pests thus affect the HEALTH of the crops and reduce their yields.
Discussion
235.

Question : What are the uses of recycled water?

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Solution :Uses for RECYCLED water: Agriculture, LANDSCAPE, Public parks, GOLF course irrigation, Cooling water for power plants and oil refineries, TOILET flushing, Dust control and Construction ACTIVITIES.
Discussion
236.

Question : What are the types of vegetable garden?

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SOLUTION :Vegetable FARMING can be classified into: i)KITCHEN or Nutrition gardening, ii) Commercial gardening, III) Vegetable forcing.
Discussion
237.

Question : What are the types of parasties associated with cattle?

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Solution :The cattle have both external parasites and internal parasites. The external parasites are on external surface of the BODY. They live on theskin and mainly cause skin diseases. The internal parasites are worms which AFFECT stomach and INTESTINE. Flukes damage the liver.
Discussion
238.

Question : What are the types of honey bees found in a colony?

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Solution :There are three types of individuals in a colony namely the Queen bee, the drones and the worker bees.
a. Queen Bee: The queen is the largest member and the fertile female of the colony.They are formed from fertile eggs.The queen is responsible for laying eggs in a colony.The LIFE span of the queen bee is 3-4 years.
b. Drones: They are the fertile males.They develop from unfertilized eggs.They are LARGER than the WORKERS and smaller than the queens.Their main function is to fertilize the eggs produced by the queen.
c. Worker Bees : They are sterile female bees and are the smallest members of the colony.Their function is to COLLECT HONEY, look after the young ones,clean the comb, defend the hive and maintain the temperature of the bee hive.
Discussion
239.

Question : What are the types of biogeochemical cycles?

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Solution :Some of the important biogeochemical cycles are:
1. WATER cycle 2. NITROGEN cycle 3. CARBON cycle
Discussion
240.

Question : What are the types of aquaculture?

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Solution :Aquaculture is classified into:
1. FRESHWATER aquaculture.
2. Brackfish WATER aquaculture.
3. MARINE water aquaculture(MARICULTURE)
Discussion
241.

Question : What are the two components of chromosome ?

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ANSWER :DNA and PROTEINS.
Discussion
242.

Question : What are the two factors of biosphere?

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Solution :BIOSPHERE is the part of the earth where life exists. All resources of biosphere can be GROUPED into two major categories NAMELY:
(i) Biotic or living FACTORS which include plants, animals and all other living organisms.
(ii) Abiotic or non-living factors which include all factors like temperature, pressure, water, soil, air and sunlight which affect the ability of organisms to SURVIVE and reproduce.
Discussion
243.

Question : What are the three stages of urine formation ?

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Solution :The process of urine FORMATION includes the following three stages.
(i) GLOMERULAR filtration
(ii) Tubular REABSORPTION and
(III) Tubular secretion
Discussion
244.

Question : What are the three limitations in dealing with infectious disease ?

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Solution :To get rid of infections, there are THREE limitations as follows:
(1) Once someone has a disease, their body functions are damaged. Their complete recovery may not be possible.
(2) The second LIMITATION is that treatment is time CONSUMING. Patient becomes bed-ridden for certain period even if PROPER treatment is given to him.
(3) The third limitation is that the person who is SICK with an infectious disease can serve as the source of infection. He/she can spread this infection to other people. This leads to the multiplication of the above difficulties.
Discussion
245.

Question : What are the strategies to support water conservation?

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Solution :Some of the strategies to support water conservation are:
(i) Rain water harvesting.
(ii) Improved irrigation TECHNIQUES,
(iii) ACTIVE use of traditional water harvesting structures.
(IV) MINIMISING DOMESTIC water consumption.
(v) Awareness on water conservation.
(vi) Construction of farm ponds.
(vii) Recycling of water.
Discussion
246.

Question : What are the species of earthworm used for vermiculture?

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Solution :Among the VAST COMMUNITY of earthworms only very few species can be USED for vermicompost production. They are Perionyx excavatus (INDIAN blueworm), Eisenia fetida(Red worms),Eudrilus eugeniae(African night crawler).
Discussion
247.

Question : What are the sources of organic resources for vermicomposting?

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SOLUTION :Materials required for vermicomposting
Biologically degradable organic wastes are used as potential organic resources forvermicomposting. They are:
Agricultural wastes(CROP residue, vegetables waste, sugarcane trash)
Crop residues(RICE straw,TEA wastes, cereal andpulse residues, rice husk, tobacco wastes,coir wastes)
Leaf LITTER
Fruit and vegetable wastes
Animal wastes (cattle dung, poultry droppings, pig slurry, goat and sheep droppings)
Biogas slurry.
Discussion
248.

Question : What are the signs of the food spoilage ?

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SOLUTION :Change in the appearance of FOOD , its colour , ODOUR and taste are some of the SIGNS of food spoilage .
Discussion
249.

Question : What are the pigments seen in the grana?

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ANSWER :CHLOROPHYLL a, Chlorophyll b, CAROTENE and XANTHOPHYLL are SEEN in the grana.
Discussion
250.

Question : What are the nutrients we get from food ?

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ANSWER :Carbohydrate, PROTEIN, FAT, MINERALS, Vitamins and Water
Discussion