Assertion Reason Question On Grade 11 Placentation

This, type of embryo sac development occurs in, a majority of flowering plants and the, common example is Polygonum., 34. Thus, posttranscription processing, which involves, splicing of introns and fusion of exons, is, required to form functional mRNA., According to Wobble hypothesis, only the, first two position of triplet codon on mRNA, have a precise pairing with the bases of, the tRNA anticodon. As a, result, the offspring that are produced are, not only similar to one another but are also, exact copies of their parent. This serves as the effective, sieve for straining plankton (mostly krill), which forms their chief food., Coprophagy is found in certain mammals, (e. rabbits). Anaphase-I, results in reduction in number of, chromosomes but each chromosome has, double the amount of DNA, so, meiosis-II, occur, during which chromatids of each, chromosome separate into different cells., Main aim of meiosis II is to separate, genetically modified chromatids of each, homologous chromosome formed during, crossing over in meiosis-I., 28. Temperate, regions have undergone frequent, glaciations in the past, due to which many, species had been killed. Reason: These flowers do not open at all. Ciliary, movement of cells lining the upper, respiratory tract, fallopian tubes and vasa, efferentia of testes transport, respectively, dust particles, ova and sperms in specific, direction in those organs. Assertion: IgM is a type of immunoglobulin which cannot cross the placenta. Reason: IgM is pentamer immunoglobulin, joined by J chain. Assertion: Schizogony is an asexual, reproduction of female Anopheles mosquito., Reason: It takes place only in human liver cells., 40. C),, Assertion Reason Question Bank, Autoallopolyploidy is the type in which, genome is in more than diploid state., Plant breeding exploits the phenomenon, of hybrid vigour or heterosis.

1. Assertion reason question on grade 11 placentation and release
2. Assertion reason question on grade 11 placentation and work
3. Assertion reason question on grade 11 placentation and treatment
4. Assertion reason question on grade 11 placentation types
5. Assertion reason question on grade 11 placentation and causes preeclampsia
6. Assertion reason question on grade 11 placentation in plants

Assertion Reason Question On Grade 11 Placentation And Release

B) Cartilage comprises of mucopolysaccharide, called chondroitin sulphate. DNA, polymorphism is the basis of genetic, mapping of human genome as well as DNA, fingerprinting. Bio] (a) How are variations useful for species if there is drastic. HIV, belongs to the family retroviruses., Usually, person shows symptoms of HIV, infection within 2 to 6 weeks of exposure to, the virus. B),, pCO2 is low, the reaction proceeds in the, opposite direction leading to the formation, of CO2 and H2O., Chloride shift is the movement of chloride, ions (Cl–) into red blood cells.

Assertion Reason Question On Grade 11 Placentation And Work

A crop expressing a cry gene is, usually resistant to the groups of insects., (b) Plant tissue culture has various, applications in the different fiields of, biology. Shoulder joints and hip joints are, the ball-and-socket joints., (c) Movements are produced at joints by, contraction of skeletal muscles inserted, into articulating bones. They are pine,, fir, hemlock, spruce, jumper, yew, larch,, deodar. A lot of them do, though, simply because it is more effective., Recognising a palindromic sequence, enables them to cut both strands of DNA, at the "same" site, because the strand will, have the same sequence only in different, directions at that site., (b) The lampbrush chromosomes are highly, elongated special kind of synapsed midproph ase or diplotene chromosome, bivalents which have already undergone, crossing over. It may be explained by giving, examples. Matrix and of the bone, also contains calcium and magnesium salts, which also adds in building rigidity of the, tissue. However, the products are soon, released and the freed enzyme is able to, bind more substrate molecules. Hence, the farmer s of, developing world relied mainly on cheaper, methods of conventional breeding thus, green revolution could not become as, productive or effective as it was in, developed world., 35. Assertion Reason Questions for Biology Chapter 24 Sexual Reproduction in Flowering Plants. This is the main, reason why very small animals are rarely, found in polar regions., 19. Assertion: Formation of nucellar endosperm, occurs by subsequent nuclear division without, wall formation., Reason: Coconut is an example of such, endosperm, where the endosperm remains, nuclear throughout the development of the fruit., 51. A) Virus is a small infectious agent that can, only replicate inside the cells of another, organism. C4-plants respond to, higher CO2 concentration by showing, increased rate of photosynthesis., 53. For example, a large number of. Assertion: The cardiac output of an athlete man, and of an ordinary is the same., Reason: It is impossible to alter the stroke volume, as well as heart rate., 26.

Assertion Reason Question On Grade 11 Placentation And Treatment

But smaller molecules like glucose,, urea, creatinine, amino acids and mineral, salts are filtered into the Bowman's capsule, in concentrations more or less similar to, their respective concentrations in the, plasma. Assertion: First seven pairs of ribs are called, true ribs., Reason: These ribs are not connected ventrally, to the sternum., 20.,, Assertion: Ball and socket joints are the most, mobile joints.,, 21.,, Assertion: Triceps is said to be an extensor, muscle for elbow joint.,, Reason: Synovial fluid is present here.,, Reason: Triceps relaxes during extension of, forearm at the elbow joint., 22. In the majority of angiosperms, the zygote divides transversely, resulting, in small apical cell towards the interior of, the embryo sac and a large basal cell., 37. Diarrhoea, caused by virus, bacteria or parasites, possesses two characteristics- firstly, the, offending organisms colonise the intestine, and as a consequence cause inflammation, of the intestine or enteritis; and secondly,, they upset the balance of intestinal fluid, absorption and secretion mechanism, often, enhancing the latter very considerably,, which is then manifested as watery stool, discharged frequently in large volumes., Shigella sp, Salmonella sp. Assertion: The fimbriae are elongated tubular, structures made of special protein., Reason: The pili are small bristle like fibres, sprouting out of the cell., 40. Inside soil, through leaching. Assertion: Biofertilizers are preferred to chemical, fertilizers., Reason: Chemical fertilizers are generally more, expensive and hazardous to environment., 28. In multicellular organism,, growth is due to mitosis. I. Assertion reason question on grade 11 placentation and work. three or more than, three leaves develop from a single node., In corymb, the main axis is shortened and, lower flowers have much longer stalks or, pedicels than the upper ones so that all the, flowers are brought more or less to the same, level. Assertion: Rumen of alimentary canal of, ruminant animals harbour numerous bacteria and, protozoa., Reason: Bacteria and protozoa help in the, secretion of gastric juice in the rumen., 18. A) Photorespiration does not produce energy, or reducing power. C) Nucleic acids are polynucleotides.

Assertion Reason Question On Grade 11 Placentation Types

Tertiary structure is, absolutely necessary for many biological, activities of proteins., Proteins and amino acids are amphoteric in, nature, i. e., in aqueous they possess both. This, minimises water loss from their body to, adjust to the concentrated saline water of, the sea., (c) Ammonia is a type of the basic nitrogenous, catabolite of proteins, that is highly soluble, in water and highly toxic to the animal., Therefore, its concentration must be kept, very low in the blood. Both these drugs, are hallucinogens., 75. Assertion reason question on grade 11 placentation and causes preeclampsia. Adrenaline is secreted, from adrenal medulla. The initiation, of vascular cambium during secondary, growth phase takes place in pericycle which, is present in between xylem and phloem. The receptalce, consists of several crowded nodes which, are separated by condensed internodes. Example, lauric, acid, myristic acid, palmitic acid, stearic, acid etc. They allow the flow of blood from, atria to ventricles and not in the backward, direction. Thus, early atmosphere of, primitive earth was strongly reducing, it, contains hydrogen, methane, ammonia and, water vapours., The Miller-Urey experiment, conducted by, chemists Stanley Miller and Harold Urey, in 1953, is the classic experiment on the, origin of life. Now, the desired gene is inserted, and the cut ends are sealed with the help, of DNA ligase.

Assertion Reason Question On Grade 11 Placentation And Causes Preeclampsia

D),, between 1, 00, 000-40, 000 years back. The gastric juice, containing enzymes and HCl is secreted, only by the fourth chamber i. e., Abomasum., Numerous tube like glands are present in, the wall of small intestine which secrete, intestinal juice into the intestinal lumen., This juice contains a number of enzymes, like enterokinase, aminopeptidases,, dipeptidases, maltase, lactase, lipase etc., for digesting various types of food. Assertion reason question on grade 11 placentation in plants. Assertion: In genetic engineering Agrobacterium tumefaciens is popular because this, bacterium is associated with the stems of all, cereal and pulse crops., Reason: A gene incorporated in the bacterial, chromosomal genome automatically get, transferred to the crop with which bacterium is, associated. The remaining three, megaspores gradually degenerate and, finally disappear. During G1 phase, the, cell is metabolically active and, continuously grows. The cost and placement of fuel, storage tanks is the major barrier to wider, adoption of CNG as a fuel. Examples of In situ, Conservation are national parks, wild life, sanctuaries, biosphere reserves and gene, sanctuaries., 51. Diplotene can last for, months and years in oocytes of some, vertebrate., 20.

Assertion Reason Question On Grade 11 Placentation In Plants

Assertion: Symbiosis is fur nished by, mycorrhiza., Reason: In mycorrhiza, symbiosis is established, between fungus and alga., 56. It also starts, starch digestion in mouth., (b) Presence of hydrochloric acid in stomach, is necessary for digestion because acidic, medium activates the action of gastric juice., HCl maintains a strong acidic pH of about, 1-2 in the stomach. Assertion: The sorus of Pteridium is of, coenosorus type., Reason: Pteridium lacks sori. Each, annual ring possesses a zone of spring and, an autumn wood. Assertion: Metamerism is the characteristic of, phylum annelida., Reason: Metamerism is one type of body, segmentation., 29. The inner most layer of, the cortex is called endodermis. A) Petroplants are plants having large amount, of latex with long chain hydrocarbons. Assertion: Artificial insemination is method of, introduction of semen inside the female., Reason: This technique is used in those cases, where males have low sperm count., 36.

Reason: The vagus normally stimulates the stomach's parietal cells to secrete acid and intrinsic factor. AnswerAnswer: (b) Pollen grain or microspore is the first cell of male gametophyte generation and represents immature male gametophyte generation and represents immature male gametophyte. Hence, they, are called pseudocoelomates., As tapeworm is an endoparasite, it does, not have alimentary canal therefore,, digested food of the host is diffused, directly through the general body surface., Plasmodium vivax is responsible for, malaria. This tissue is, used by developing embryo., 31.

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