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4151.	Question : Briefly describe the digestion of food materials in alimentary canal with the help of a diagram.
Answer» Solution :1) The alimentary canal is basically a long tube extending from the mouth to the anus. 2) Food is masticated by our teeth in the mouth and mixed with saliva to make it slippery and wet. 3) Salivary glands SECRETE saliva which contains amylase that helps in the breakdown of carbohydrates into simple ones. 4) The soft food mixed with saliva passes through oesophagus or food pipe by wave like movements called peristaltic movements to the . stomach. 5) The gastric glands in the stomach secrete gastric juice that contains hydrochloric acid, PROTEIN digesting enzyme pepsin and mucus. 6) Bile juice secreted by liver and pancreatic juice secreted by pancreas release into the DUODENUM of SMALL intestine. 7) Emulsification of fats is done by bile juice. Pancreatic juice contains enzyme trypsin for carrying on the process of digestion of proteins and lipase for fats . 8) Complete digestion of carbohydrates, fats and proteins takes place in the smallintestine by intestinal juice. 9) Finger-like projections present in the walls of small intestine are called villi. They absorb the DIGESTED food into the blood. 10) Rest of thefood is sent into the large intestine where most of the water present in it is absorbed from the food. 11) This material is then expelled through the anus which is the last part of the alimentary canal.

4152.	Question : Briefly describe any five functions of blood .
Answer» Solution :(1) Blood helps in TRANSPORT ofnutrients sugars , amino acids, mineralsvitamins are PICKED up by blood from intesine and transported to various par of the body. (2) It transports oxygen and carbon DIOXIDE. (3)Blood helps in regulation of body temperature. It distributes heart to all parts of the body. (4) Blood containsleukocyteswhich are HELPFUL in fightingagainstmicrobes. (5) In the region of INJURY the blood coagulates and seals the region the preventthe loss ofbody fluids and check the entry of germs.

4153.	Question : Breakdown of pyruvate by using oxygentake place in :
Answer» NUCLEUS MITOCHONDRIA CHLOROPLAST Cytoplasm Answer :D

4154.	Question : Break down of glucose into pyruvate take place.
Answer» NUCLEUS MITOCHONDRIA CHLOROPLAST Cytoplasm Answer :C

4155.	Question : Branch connected with nomenclature, identifi cation and classification is
Answer» Ecology Taxonomy Morphology Physiology ANSWER :B

4156.	Question : Brain and Spinal cord are two vital organs of our body'. How is our body designed to protect them ?
Answer» Solution :BRAIN and spinal cord are the parts of central nervous system. Brain is located INSIDE a BONY BOX, nemed as cranium and a fluid is present in this balloon, known as cerebrospinal fluid which is a shock absorber. Spinal cord is placed in a vertabral column and back bone PROTECTS it.

4157.	Question : Botulism is a
Answer» type of food POISONING DUE to saprophytic bacterium disease in man due to PARASITIC bacteria disease of plants due to viruses disease in various animals ANSWER :A

4158.	Question : Both the types of pea plants, used as parent generation by Mendel in his experiments, were pure breeds in the expression of their characters.
Answer» ANSWER :1

4159.	Question : Both erythrocytes and leucocytes are formed in the
Answer» BONE marrow thymus arterial walls lymph NODES ANSWER :A

4160.	Question : Both CO_(2) and H_(2) gases are :
Answer» HEAVIER than AIR colourless acidic in NATURE SOLUBLE in water. Answer :A::C::D

4161.	Question : Bone forming cells are
Answer» osteoblasts osteoclasts chondrolbasts chondroclasts Answer :A

4162.	Question : The body wall of a leech comprises of ________ layers
Answer» 2 3 5 4 Answer :C

4163.	Question : Body cavity of earthworm is called
Answer» TRUE coelom pseudocoel acoelom haemocoel ANSWER :A

4164.	Question : BOD stands for
Answer» BIOCHEMICAL oxygen demand chemical oxygen demand growing ALGAE in LARGE tanks BIOTIC community ANSWER :A

4165.	Question : BOD of a pond is related to _____ in per unit volume of water.
Answer» all the PLANTS all the nektons all the microbes all the animals Answer :C

4166.	Question : Blue eye colour in human is recessive to brown eye colour. The expected children of a marriage between blue-eyed woman and brown-eyed male who had a blue-eyed mother are likely to be
Answer» all blue-eyed three blue-eyed and ONE brown-eyed all brown-eyed one blue-eyed and one brown-eyed Answer :D

4167.	Question : Blood vascular system of earthworm is of
Answer» OPEN TYPE closed type PORTAL type none of these ANSWER :B

4168.	Question : Blood pressure is measured by an instrument called
Answer» MANOMETER BAROMETER Anemometer Sphygmomanometer Solution :Manometer is used to measure pressure of GASES and LIQUIDS. Barometer measures atmospheric pressure and Anemometer measures WIND velocity.

4169.	Question : Blood pressure is measured by an instrument called ________.
Answer» SOLUTION :SPHYGMOMANOMETER

4170.	Question : What are the major parts in human excretory system ?
Answer» Solution :Kidneys remove garbage from our body. They ALSO work towards balancing the AMOUNT of vitamins , minerals, fat and protein that are FOUND m the blood. They do this so that our body can easily perform day to day activities. 2 ) The right and left kidneys are assisted by a number of organs m the body which help in disposing waste products. 3 ) Our intestine makes solid waste materials and is excreted through digestive tract. 4) Each day our body eliminates around 1.6 to 1.8 liters of urine which contains liq. uids, minerals and vitamins that are of no use of the body. 5) The bladder of a human body is nearly the same size as the average of human brain. 6) In one individuals life span the liver can produce around 184.275 kgs of bile (6500 ounces). 7) In our lifetime an INDIVIDUAL could urinate close to 7,850,000,000 gallons of fluid. 8) There are two kidneys in the human body. The left kidney is always found higher than the right kidney. 9) A really extraordinary fact regarding the excretory system is that upto 400 ml of urine can be held in human bladder. 10) Urine contains a high amount of urea which can be used by plants as a source ofnitrogen. Because of this DILUTED urine can be used in gardens and poUed plants. 11) It is amazing to see that each kidney is made up of approximately more than on~ million microscopic tubular functional units called nephrons or uriniferous tubules.

4171.	Question : Blood groups in man were discovered by
Answer» Mendel Francis Nelson S. Miller Landsteiner ANSWER :D

4172.	Question : Blood clot inside a blood vessel is known as
Answer» thrombosis agglutinin clot Thrombus Answer :D

4173.	Question :Blood clotting factors are developed to treat...........
Answer» SOLUTION :HAEMOPHILIA

4174.	Question : Blood capillaries are lined with cuboidal cells.
Answer» ANSWER :F

4175.	Question :Blood cancer is called.............
Answer» SOLUTION :LEUKAEMIA

4176.	Question : Bladderworm is a stage in the life history of
Answer» LIVER fluke planarian roundworm tapeworm ANSWER :D

4177.	Question : Black mould is the common name for
Answer» ASPERGILLUS niger Penicillium notatum Albugo candida Saccharomyces octosporous ANSWER :A

4178.	Question : Black lung disease is common in
Answer» FARMERS COAL miners refinery workers workers of petrochemical INDUSTRY ANSWER :C

4179.	Question : Birds have evolved from reptiles.
Answer» ANSWER :1

4180.	Question : Birds have
Answer» one right aortic arch one LEFT aortic arch one arch POORLY developed and other FULLY developed both ARCHES are fully developed Answer :A

4181.	Question : Birds differ from reptiles in which one of the following character?
Answer» SKIN has scales. They are vertebrates. There is REGULATION of BODY temperature. They lay EGGS. ANSWER :C

4182.	Question : Birds are this glorified reptiles statement is given by
Answer» Darwin Huxley Lamarck Mendel Answer :B

4183.	Question : Bipolar neurons are found in_____
Answer» RETINA of eye cerebral CORTEX embryo respiratory EPITHELIUM ANSWER :A

4184.	Question : Biotic components include
Answer» only PRODUCERS producers, CONSUMERS and DECOMPOSERS only consumers only producers and consumers ANSWER :C

4185.	Question : Biotic factors
Answer» SOLUTION :PLANTS, ANIMALS

4186.	Question : Biologists who study the sequences of organisms in the fossil record are
Answer» taxonomists palaeobiologists misologists systematists Answer :B

4187.	Question : Biologist observe 5th June as
Answer» DARWIN birthday World ENVIRONMENT DAY World population day World hygiene Answer :B

4188.	Question : Biogeochemical cycles are also known as
Answer» cycles of matter SEDIMENTARY cycles MATERIAL CYCLING GASEOUS cycles Answer :A

4189.	Question : Biogeochcmical cycles are also known as
Answer» CYCLES of MATTER SEDIMENTARY cycles material cycling GASEOUS cycles Answer :A

4190.	Question :Biogenetic law was propounded by
Answer» VON BAER and HAECKEL Von BIER and Aristotle Haeckel and Mendel Mendel and Griffith Answer :A

4191.	Question : Biogenetic law states that
Answer» ONTOGENY and phylogeny GO together Ontogeny RECAPITULATES phylogeny Phylogeny recapitulates ontogeny There is no relationship between phylogeny and ontogeny Answer :B

4192.	Question : Biogas obtained from decomposition of biomass by the activity of ……………......... microorganisms.
Answer» ANSWER :ANAEROBIC

4193.	Question : Biogas is fossil fuel.
Answer» SOLUTION :Correct statement: BIOGAS is the MIXTURE of METHANE, hydrogen sulphide, carbon-di-oxide and hydrogen.

4194.	Question : Biodiversity can be conserved by,
Answer» agro-FORESTRY SOCIAL forestry MAINTAINING orchards plantation Answer :B

4195.	Question : Biodiversity
Answer» Solution :(i) Biodiversity is the richness of living organisms in nature due to presence of varieties of organisms, ecosystems and genetic variations within a species. Biodiversity occurs at three different levels. (a) Genetic Diversity: OCCURRENCE of diversity among the organisms of same species is genetic diversity. For example, each HUMAN being is different from the other. (b) Species Diversity : Innumerable species of organisms occur in nature. This is called as species diversity. Species diversity includes various types of PLANTS, animals and MICROBES. (c) Ecosystem Diversity : Many ecosystem are present in each REGION. Ecosystem is formed through the interaction between plants, animals, their habitat and changesin the environment. Each ecosystem has its own characteristic animals, plants microbes and abiotic factors. Ecosystem are also of two types, natural and artificial.

4196.	Question : Biofortification may help in removing hidden hunger .How?
Answer» Solution :Bio-fortification is the scientific process of helping crop plants, enriched with high levels of desirable NUTRIENTS like vitamins, proteins and minerals. Micronutrient MALNUTRITION is called hidden hunger, the lack of micronutrients such as vitamin A, zine and iron in the dict. Bio-fortification is effective in removing hidden hunger and improving the nutritional value of food. SCIENTISTS breed crops whose ediblc parts (seed, tuber and roots) have improved nutritional value. Bio-fortified foods can contribute to body stores of micronutrients throughout the life cycle. Some example of crop varieties developed as a result of bio-fortification are: 1. Protina, SHAKTI and Rathna are lysine RICH maize hybrids 2. Atlas 66, a proteinrich wheat variety. 3. Iron rich fortified rice variety 4. Vitamin A enriched carrots, pumpkin and spinach

4197.	Question : Bio-diversity
Answer» SOLUTION :Biodiversity is the RICHNESS of living ORGANISMS in nature due to presence of varities of organisms, ecosystems and GENETIC VARIATIONS within a species.

4198.	Question : Binary Fission is :
Answer» SEXUAL METHOD of reproduction ASEXUAL method of reproduction Both (A) and (B) NONE of the above. Answer :A

4199.	Question : Binary fission is observed in which one of the following figures?
Answer» ANSWER :C

4200.	Question : Binary fission is a type of sexual reproduction.
Answer» SOLUTION :FALSE - ASEXUAL REPRODUCTION.

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