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The sensitive strain can, also become killer if it receives sufficient, kappa particles., (c) Structural nonhistone chromosomal, proteins are called scaffold proteins as they, constitute the core axis of the chromosome., They contain very little lysine and arginine, but instead possess abundant tyrosine and, tryptophan types of amino acids., (a) Unlike DNA, RNA is usually singlestranded. Assertion: In frog, most of the absorption takes, place in intestine., Reason: The intestine in frog is the coiled, structure., 69. Assertion reason question on grade 11 placentation and use. Succulent fruits- Succulent fruits are the indehiscent fruits which means their seeds are separated after the decay of the flesh. Due to this, irreversible change, enzymes lose their, specific activity when heated., 20.
Thus, more, adaptive forms increase. It is also called ozonosphere.,, Ozonosphere lies at altitude of 23-25 km, over equator and at slightly lower altitude, elsewhere with 11 -16 km height over poles., 90% of atmospheric ozone is present in, ozonosphere. Assertion Reason Questions for Biology Chapter 24 Sexual Reproduction in Flowering Plants. Such a system is also named, as cymose tap root system., The fleshy roots are thickened like the palm, of human hand. Photosynthetic pigments, include chlorophyll a, chlorophyll b,, carotenes and xanthophylls. In, plant breeding, to increase the traits of that, parent back cross is performed after few, times in order., In order to obtain its disease resistance., For example, a crop plant is crossed with a, wild variety. These, have no role in photorespiration., 28. So, there is not enough, time for the absorption of water and electrolytes, by colon., 41.
Fibrin is an, essential component of blood clotting. Assertion: The immediate ancestor of present, day humans was Australopithecus., Reason: The fossils of Australopithecus were, discovered from Australia, and its cranial, capacity was 1150-1300cm3 which is very close, to that of humans 1400-1450 cm3., 71. In surface, feeders, the tap root does not elongate very, much. These hormones increase, alertness, pupillary dilation, piloerection,, sweating, etc. It is attached to hypothalamus by, hypophyseal portal vein. The cerebral, cortex is referred to as the grey matter due, to its greyish appearance. The division, of the primary endosperm nucleus and a, few subsequent nuclear division are, regularly followed by wall formation. Assertion reason question on grade 11 placentation in solanaceae. A),, gradients across the resting membrane are, maintained by the active transport of ions, by the sodium-potassium pump which, transports 3 Na+ outwards for 2 K+ into, the cell. Assertion: Organ of Jacobson is well, developed in snakes., Reason: It is responsible for smell.
They cause growth in length., The meristem which occurs between, mature tissues is known as intercalary, meristem, commonly located at the bases, of leaves, above the nodes (e. g., grasses), or below the nodes (e. g., mint). 00 µm) but are strong, absorbers of long wave or infra red, radiations emitted by the surface of the, earth., The warming up of global atmosphere in, present time is due to the increase in green, house effect. Soon, planktonic algae increase in number and, impart a characteristic colouration to water, depending upon the pigments present in, them. It is required for, perpetuation of a population. It is formed, by secondary growth. Assertion: IgM is a type of immunoglobulin which cannot cross the placenta. Reason: IgM is pentamer immunoglobulin, joined by J chain. It is, totally reabsored and does not appear in, the urine so long as its blood level does, not exceed 180 mg. That is why,, it is also called 'birth hormone'., Prolactin or lactogenic hormone or, luteotrophic hormone (LTH) is secreted by, the anterior pituitary which helps in the, growth of mammary glands during, pregnancy and initiates the secretion of, milk after child-birth., (a) The Juxtaglomerular cells of kidney, produce erythropoietin which is, responsible for stimulating the formation, of RBCs. Many, organisms do not reproduce, e. g., mules,, sterile worker bees, infertile human couples., Therefore, reproduction is not an all, inclusive characteristic of living organism.
A food web, consists of many food chains. Benzer, coined the terms cistron (unit of function),, recon (unit of recombination) and muton, (unit of mutation)., In pleiotropism, a single gene affects a, number of phenotypic traits in the same, organism. Assertion: Radius is shorter than ulna., Reason: It has large olecranon process., 18. The dough, swells up or leavens. In, such persons, the lactose of milk remains, undigested and is fermented in the intestine, producing gases and acids. Assertion: Endosperm development proceeds, embryo development., Reason: It assures nutrition to developing, embryo. Bio] (a) How are variations useful for species if there is drastic. These Questions are designed to learn each student and academics by providing chapter-wise further issues focusing totally on testing conceptual information with applications. It can be, used at any time in future., The elimination of pests would increase, the yield in agriculture production.
A fish, may carry these tiny parasites to great, distances before they drop off., Considering the sluggish habits and poor. A, small cut may lead to bleeding till death., Men are affected by this disease while, women are the carriers., Mutation of a structural gene on, chromosome number 15 causes Marfan, syndrome. It also activates other, pancreatic proteases., 13. C) Bladder cancer is caused by certain dyes., It is most commonly reported in the worker, who work in industries such as dyeing and, printing where these are exposed to aniline., 59. C),, surface of membrane while the integral, proteins are partially or totally buried in, the membrane., A special membranous structure is the, mesosome which is formed by the extension, of plasma membrane into the cell. Coacervates do not, have lipid outer membrane, hence they, cannot reproduce., The RNA world is proposed as the first, stage in the evolution of life in which RNA, catalysed all molecules necessary for, survival and replication.