Sex, organs in them are male gametes and female, gametes., 30. Assertion-Reason Question Bank - Disha Experts.pdf - Biology - Notes. Assertion: Small leaflets are present on the, phyllode of Parkinsonia aculeata., Reason: Phyllode does not bear leaves and, flowers., 21. On the contrary,, polycythemia is the condition which arises, due to the abnormal rise in the total count, of RBC., 22. AnswerAnswer: (a) Cleistogamous flowers do not open at all thus ensuring fertilisation and hence produce assured seed-set even in the absence of pollinators. Assertion: Saline water is not given to patients, of hypertension., Reason: Saline water can cause vomiting and, may drop blood pressure suddenly causing, cardiac arrest.
In several cereals, they are, obtained from embryo. Assertion: Replication on one strand of DNA is, continuous and on another is discontinuous., Reason: The DNA polymerase works in 3' ® 5', direction., 17. Assertion: Biosynthetic phase in, photosynthesis is also called dark phase., Reason: Biosynthetic phase in, photosynthesis is also called Blackman's, reaction., 50. Fuse with the pericarp, accessory fruit, or pseudocarp. Some important food, plants, wheat, barley, rye have two kinds, of varieties: winter and spring varieties. Assertion: Cutaneous glands help in regulation, of body temperature., Reason: Cutaneous glands are produced from, stratum germinativum., 27. Assertion: Flora contains the actual account of, habitat and distribution of plants of a given area., Reason: Monographs contain detailed, information on any taxon., 42. Assertion: Cells are living and thin walled and, their cell wall are made up of cellulose., Reason: The radial conduction of water in plants, takes place by the help of these tissues., 25. Assertion reason question on grade 11 placentation in solanaceae. G., Mangifera indica, (Mango), Solanum tuberosum (potato) and, Panthera leo (lion). Many of the botanical, gardens have seed banks, tissue culture, facilities and other ex-situ technologies., Similarly, most of the zoological gardens, have well managed captive breeding, programmes. In vasectomy, a small part, of the vas deferens is removed or tied up, through a small incision on the scrotum, whereas in tubectomy, a small part of the, fallopian tube is removed or tied up through, a small incision in the abdomen or through, vagina., 26. Green muffler or green belt, vegetation is rows of trees and shrubs, grown and maintained to serve as noise, absorbers.
Large areas will become, deserts. The auricle opens, to the ventricle through atrioventricular, aperture. C) Wood is the secondary xylem that forms, the bulk of the stem. Assertion: In Funaria is monoecious., Reason: Cross fertilization occurs in Funaria., 38. B) Electron transport in photosynthesis, produces a proton gradient. Assertion reason question on grade 11 placentation and non. The, cambial activity continues in this region., 53. D) Agrobacterium tumefaciens infects certain, plants, (dicots) in which Ti-plasmid causes, the formation of tumour like growth called, a crown gall. Reason: The lining of uterus is always thick and spongy.
Cell growth, results in disturbing the ratio between the, nucleus and the cytoplasm. I) Both the, male and female animals selected for, breeding should be of superior quality. This phenomenon is called, metamere or metameric segmentation., Phylum annelida represents the first group, of metazoan animals developing a true, coelom with metameric segmentation., In annelida, blood is red due to the, presen ce, of, haemoglobin, or, erythrocruorin dissolved in plasma. 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. Assertion: Characters of cyclostomes show an, advance over Amphioxus., Reason: Cyclostomes have some degenerated, characters., 50. Assertion: IgM is a type of immunoglobulin which cannot cross the placenta. Reason: IgM is pentamer immunoglobulin, joined by J chain. The purpose or, function of phyllotaxy is to arrange leaves, in such a manner that all of them get proper, exposure to sunlight. This in, sharp contrast to the 50% recombinant, gametes a characteristic of independent, assortment.
However, if some variations were to be present in a few individuals in these populations, there would be an increased chance for the population to survive. A) Cardiac muscle cells are short cylindrical, cells joined end to end and by side, branching to form a network. But here, similar cells, are arranged neither in permanent layer nor, masses to form tissues., (a) All members of animalia are multicellular,, but all of them do not exhibit the same, pattern of organization of cells. The increased CO 2, concentration reduces the affinity of, haemoglobin for oxygen. C) Splicing is the editing of the nascent, precursor messenger RNA (pre-mRNA), transcript into a mature messenger RNA, (mRNA). A, fruit formed without fertilisation, i. e., a, seedless fruit is called parthenocarpic fruit, e. g., banana., 60. Assertion reason question on grade 11 placentation and service. Mitosis involves replication, and equitable distribution of all the, chromosomes so that all the cells of a, multicellular organism have the same, number and type of chromosomes. Assertion: The increased permeability of the, lymph capillaries is easily altered., Reason: The increased permeability of the, capillary walls leads to oedema or swelling., 34. Page 221: Human Health & Disease,, 14.,, (b),, 15.,, (c),, 16. Its, gene is never found on chromosome Y., 55.
The typhlosole in, earthworm increases the surface area of the, intestin e for efficient secretion and, absorption during digestion., Lateral line system of fishes and aquatic, larval amphibians whose receptors are, group of sensory cells derived from, ectoderm., Most arthropods, certain molluscs and, tunicates contain open circulatory system., In them, a fluid composed of blood mixes, with tissue fluid bathing internal tissues,, 35. Body Fluids and Circulation,, 124-129. B),, irritation to nasal passages. Assertion: In TCA cycle, the first step is the, condensation of pyruvate with oxaloacetic acid, and water., Reason: This reaction is catalysed by enzyme, pyruvate synthase., 17. If the wings develop from, places other than pericarp in achenial, winged fruits then they are called samaroid, e. Bio] (a) How are variations useful for species if there is drastic. g., sepals in Shorea., 67. Assertion: Heterochromatin is transcripationally, inactive., Reason: Heterochromatin is densely packed., 61. Magnesium is also an activator, for those enzymes involved in the, synthesis of nucleic acids (DNA, RNA), from nucleotide polyphosphate., 14. The portion of the myofibril, between two successive 'Z' lines is, considered as the functional unit of, contraction and is called a sarcomere., During contraction, the 'Z' lines attached, to the actins are pulled inwards thereby, causing a shortening of the sarcomere, i. e.,, contraction. It is the yeast that helps, the dough to rise., (d) Rennet is obtained from calf 's stomach and, is a commercially available form of enzyme, rennin.
Thus, the growth of each, axis is checked. Natural, stratification occurs when seeds shed in, the fall are covered with cold soil, debris, and snow. We hope we have given the updated helpful answer / content for your query in an easily accessible format to help you in preparing adequately. It mainly, consists of proteins, polysaccharides and, water.
Ancon sheep is a short legged, variety which appeared suddenly in, Massachusetts in 1971. D) The TCA cycle starts with th e, condensation of acetyl group with, oxaloacetic acid (OAA) and water to yield, citric acid. Symptoms of alcohol, intoxication include confusion, lack of, coordination, unsteadiness that makes it, hard to stand or walk, or erratic or unsafe, driving. The seeds that develop, post-fertilisation, are not covered or are, naked. It is a characteristic of mass, flow of that substance, whether in solution, or in suspension, are swept along at the same, pace, as in a flowing river. Food, reaches every cell of an organism for, respiration to take place.
C4-plants respond to, higher CO2 concentration by showing, increased rate of photosynthesis., 53. Curiously, many human adults can not, digest milk, because with age they produce, little or no lactose in the intestinal juice. Crop land is, man made ecosystem. The other male gamete fuses with, the two polar nuclei (or secondary nucleus), to form the triploid primary endosperm, nucleus, PEN (triple fusion or vegetative, fertilization). The curvature of the ovule, also affects the nucellus in a way that the, later becomes horse shoe-shaped the ovule, is called amphitropous., 38. Assertion: Cohesion, adhesion and surface, tension provides high tensile strength to water., Reason: Capillarity is aided by small diameter of, the tracheary elements., 36. Assertion: Guttation is the loss of water in its, liquified phases from the leaves., Reason: Guttation takes place at night only., 25. The pericarp of wheat is, thus, dry and it is fused with testa., 65. These, sequences are nucleotide sequences that, are repeated many times, sometimes, hundred to thousand times.
B) The chorionic cells secrete a hormone, called human Chorionic Gonadotropin, (hCG), which resembles and takes over the, job of pituitary LH during pregnancy. It checks pregnancy by, preventing deposition of semen in the, vagina. The antheridia, (male sex organ) are formed at the summit, of a relatively small, main leafy shoot which, develops first from the parent plant., The female branch arises later as a lateral, outgrowth from the base of the parent male, shoot.