Assertion: Holoblastic Cleavage With Almost Equal Sized Blastomeres Is A Characteristic Of Placental Animals.Reason: Eggs Of Most Mammals, Including Humans, Are Of Centrolecithal Type

Thursday, 11 July 2024

It has vessels and tracheids which, are well adapted for water translocation., 39. All motor neurons, are efferent neurons, because they, conduct impulses from the CNS system to, the peripheral tissues viz, muscles and, gland., The brain and the spinal cord constitute, the central nervous system. Assertion Reason Questions for Biology Chapter 24 Sexual Reproduction in Flowering Plants. C),, in banana and aroids, the brightly coloured, spathe attracts insects to facilitate, pollination., Scilla synthesise its food stored in the leaf, bases. Assertion: If pollen mother cells has 42, chromosomes, the pollen has only 21 chromosomes., Reason: Pollens are formed after meiosis in, pollen mother cell., [AIIMS 1997], 24.

Assertion Reason Question On Grade 11 Placentation In Solanaceae

B) The physiological mechanism of flowering, in plants is controlled by two factors__ light, period and low temperature. In this method,, ova from the wife/donor female and sperms, from the husbands/donor male are induced, to form zygote in the laboratory. Therefore, a, gene can have more than two allelomorphs., These allelomorphs make multiple alleles, series., In most birds, the females are heterogametic, (designated as Z W) and males are, homogametic (designated as Z Z). Nut- Nuts are also unilocular and one seeded fruits that develop from bi or multicarpellary syncarpous superior ovary. It is the, phenotypic superiority of the hybrid over, either of its parents in one or more traits., These hybrids generally have greater, strength and resistance to disease and, larger life span than either parents. The, fertile leaves of the shoot become, microsporophylls (stamens) and megasporo, phylls ( carpels) which bear anthers and, ovules respectively. Mineral Nutrition,, 88-92,, 13. Biomes are of two types –, terrestrial and aquatic. It provides good, anchorage to the plant, helps in proper, absorption of water and minerals. Sex corticoids stimulate the, development of external sex characters., The adrenal cortex produces glucocorticoids, which stimulates gluconeogenesis, lipolysis, and proteolysis, and inhibit cellular uptakes, and utilization of amino acids. Starch is often present., The primary CO2 acceptor in C4 cycle is a, 3-carbon molecule phosphoenol pyruvate, (PEP) present in the mesophyll cells. Amphetamines, are found in the urine soon after ingestion., Since metabolism of amphetamines is slow, the, drug is found in the urine for several subsequent, days. Assertion: IgM is a type of immunoglobulin which cannot cross the placenta. Reason: IgM is pentamer immunoglobulin, joined by J chain. These vaccines are not being used, to control the HIV infection in India., Treatment of AIDS with anti-retroviral, drugs is only partially effective. They are, produced through genetic engineering., The recombinant therapeutics are identical, to human proteins they do not induce, unwanted immunological responses and, are free from risk of infection as is, commonly observed in case of similar, products isolated from non-human sources.

Assertion Reason Question On Grade 11 Placentation And Release

C) Mycorrhiza represents mutualistic, symbiosis between fungus and roots of, higher plants. Schwann cells are the, neuroglial cell, which are present in PNS., The layer of cells which covers the cerebral, hemisphere is called cerebral cortex and is, thrown into prominent folds. Assertion reason question on grade 11 placentation in solanaceae. D) Eukaryotic mRNA is called monocistronic, i. e., formed from one gene. The parasites initially multiply, within the liver cells and then attack the, red blood cells (RBCs) resulting in their, rupture. Primate evolution, began 80-100 million years ago. A) Amphibolic pathway is the pathway that, function s for both catabolism and, anabolism reactions.

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Page 72: EBD_7166, 68,, animal cells help to organize the assembly, of microtubules during cell division., Centrioles replicate during the interphase, stage of mitosis and meiosis., 38. Assertion: Interferons are a type of antiboides, produced by body cells infected by bacteria., Reason: These stimulate inflamm-ation at the, site of injury., 41. These root hairs also withdraw, from interspaces, which are not in contact, with epiblema of the root. Assertion: The genetic code is degenerate., Reason: Most amino acids are coded by more, than one codon., 52. Assertion: Holoblastic cleavage with almost equal sized blastomeres is a characteristic of placental animals.Reason: Eggs of most mammals, including humans, are of centrolecithal type. On the mother's side are blood spaces, which surround the villi. Assertion: Calotes, Crocodilus and Chelone, are members of class Reptilia., Reason: Heart is three chambered in Calotes,, Crocodilus and Chelone., 71. C) Auditory ossicles are the three small bones, present in the cavity of the middle ear.

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C) According to carbonic acid exchange, theory, CO2 released during respiration of, roots combines with soil water to produce, carbonic acid (H2 CO3). Under, anaerobic conditions, pyruvate is used as, a hydrogen acceptor and converted into, lactate. After its formation, clot starts, contracting and a pale yellow fluid, the, serum, oozes out. For example, in the, grasses when the internodes complete, their elongation, some cells at the base, retain their meristematic activity and, function as intercalary meristems. These organism were, called chemoautotrophs., According to Lamarck's theory, continuous, disuse of organs makes them weak. An isolated piece of, DNA without origin of replication or 'ori', site cannot replicate and is gradually lost, during nuclear divisions. C),, Because of the increasing demand and, decreasing natural resources, there is an, attempt to develop new strains suitable for, agricultural production., Some bacteria and fungi can change H2S, and elemental sulphur to sulphate state, (e. g., Beggiotoa, Thiobacillus, Penicillium,, Neurospora). These two zooids, are(i) Polyps – the nutritive zooid of the, colony, (ii) Gonangium – the reproductive zooid., (a) Alternation of generations may be defined, as a phenomenon whereby, during the life, history of an organism, a diploid asexual, phase and a haploid sexual phase regularly, alternates with each other. Assertion: DNA is associated with proteins., Reason: DNA binds around histone proteins, that form a pool and the entire structure is called, a nucleosome. Three types, of cell junctions are found in the epithelium, and other tissues. These transgenic organisms, acts as living microfactories that produce, proteins like human insulin, human growth, hormone, etc. Assertion reason question on grade 11 placentation pdf. Assertion: hnRNA is larger than mRNA., Reason: hnRNA has non-translating introns, which are not required for translation., 57. A),, that are unfavourable to the pathogen, thus, reducing crop losses.

The radial conduction of water, takes place by the ray parenchymatous, cells., Usually phloem transports food material, from leaves to other parts of the plant. Assertion: Phylum arthropoda is the largest, phylum of Kingdom animalia., Reason: It includes the largest number of, animals with approx. Plants such as ferns and several, herbaceous plants growing on the ground, under the dense canopy of trees, are shade, tolerant plants., Leaf butterfly is green in colour and stick, insect also mimics in order to escape from, the enemies and also to catch prey. The, result is that expiration begins. Assertion: Pinus shows formation of annual, rings., Reason: It grows in areas of environmental, fluctuation., 64. Page 49: Morphology of Flowering Plants, filaments only. Assertion reason question on grade 11 placentation and release. In, dicot stems, it is situated around the ring, of vascular bundles in the stele. When, the body temperature rises too much, the, sweat glands are stimulated to take up, water from blood vessels and to pour out, their secretion on the general surface of, the skin. The arrangement of flowers is either, basipetal or centrifugal., Sepals or calyx constitute the outermost, series of green foliaceous floral organs, which are mainly meant for protecting other.

It does, not involve doubling of chromosomes., Also called amitosis., 14. These are spherical species small, and large, contain water and food in various, phases of digestion.