Correct option:(2) Secondary nucleus is a sister nucleus of the egg Solution: In angiosperms, secondary nucleus and egg cell is formed from haploid nucleus of functional megaspores. It undergoes...
Correct option:(2)Apical meristem Solution: To obtain virus/disease free plant from an infected plant, meristem culture is opted as meristematic cells are free of virus or disease causing agent....
Correct option:(4)Cork cambium Solution: Sacculina and crab show parasitism. It is an intra specific interaction in which one of the species (parasite) is benefited while the other one (host) is...
Correct option:(1) Solution: Coronary sinus - (iv) Base of systemic aorta - (iii) Le atrioventricular valve - (i) Opening of inferior vena cava - (ii)
Correct option:(2)Natality and immigration increases Solution: Density increases when birth rate (Natality) and Immigration (inflow of population) increases.
Correct option:(1)16 Solution: Linkage groups in a species correspond to its haploid number. In honeybees, total chromosomes = 32 ∴ Linkage groups=3/2 Haploid no. of chromosome in honeybee = 16
Correct option:(2)Kidney Solution: Erythropoietin is produced in the kidneys and plays a key role in production of RBC's.
Correct option:(3)HCG Solution: In second trimester, the hormone levels stabilizes as HCG declines. Corpus luteum deteriorates and placenta completely takes over the production of progesterone which...
Correct option:(4)Homo neanderthalensis Solution: Its fossil was invented by J.K. Fuhlort on Neanderthal valley, Germany. C.C = 1450 mL These were heavily built & short.
Correct option:(4)Corpora striata Solution: Ventrolateral walls of the cerebrum are thick and called corpora striata. Sulci divides hemisphere into four lobes-frontal, parietal, occipital and...
Correct option:(3) Carboxyhaemoglobin Solution: Carbon monoxide combines with haemoglobin and forms Carboxyhaemoglobin. Haemoglobin has more affisency to combine with CO than oxygen.
(1) Constant region of heavy chain (2) Antigen binding site (3) Disulphide bond (4) Light chain Correct option:(2)Antigen binding site Solution: X is antigen binding site. Antigen combines with the...
Correct option:(3)Second polar body Solution:
Correct option:(2)Female banded krait Solution: Dr. Lalji Singh obtained radioactive DNA probe from Y chromosome of female banded krait.
Correct option:(1)zoological parks Solution: Zoological parks are ex-situ conservation of biodiversity. Ecologically unique and biodiversity-rich regions are legally protected by the forest...
Correct option:(1)Goblet cell Solution: Unicellular glands are single celled secretory cells. Goblet & mucous cells are major example of unicellular glands in humans.
Correct option:(1)Follicular cells Solution: Ovary shows cyclic changes during menstrual cycle. Cortical region shows diffrent stages of development of ovarian follicles or Graafian follicles. Each...
Correct option:(3) Human females have double dose of X chromosome Solution: Human females are XX and hence they show double dose of X chromosome. Sex linked traits appear more frequently in males...
Correct option:(4)Myocardial infarction Solution: Myocardial infarction is commonly known as heart attack. It occurs when blood flow decreases or stops to a part of the heart causing damage to heart...
Correct option:(1)Archeozoic Solution: Molecular evolution and origin of Earth was observed in Archeozoic Era. Archaeozoic era (3800 million years ago) is marked by origin of life. The first...
Correct option:(4) Solution: Chloroplast is plastid for Photosynthesis. Leucoplast is plastid for storage of starch, lipids & proteins.
Correct option:(3)Klinefelter's syndrome Solution: Klinefelter's syndrome has 44A + XXY one extra X-chromosome is present.
(1)X - Smooth endoplasmic reticulum, Y Rough endoplasmic reticulum (2) X - Microvilli, T - Golgi apparatus (3)X - Endoplasmic reticulum, Y - Mitochondria (4) X - Centrioles, Y - Microvilli Correct...
Correct option:(4) Sucrase, Maltase, Dipeptidase Solution: Succus entericus contains Sucrase, Maltase, Dipeptidase
Correct option:(4)Larynx Solution: Adam's apple is Larynx (Sound Box). More prominent in Males.
(1) Tunica media (2) Tunica externa (3) Tunica interna (4) Tunica albuginea Correct option:(3)Tunica interna Solution: Tunica interna is the innermost layer.
Correct option:(2)Growth of Graafian follicle Solution: FSH is Folicle Stimulating Hormone brings about maturation of graafian follicle.
Correct option:(1)Natural acquired active Solution: A child are attack of measles develops Natural Acquired active Immunity. Natural Acquired active Immunity is the immunity acquired due to...
Correct option:(3)Galapagos Islands Solution: Darwin observed a variety of Finches in Galapagos Islands.
Correction option:(1)Oedema of lower legs and face Solution: Marasmus is prolonged protein energy malnutrition. Atrophy of digestive glands & intestinal mucosa is seen due to which absorption of...
Correct option:(2) Drpithecus Solution: Dryopitheus is not a connecting link. Archeopteryx is connecting link between birds & Reptils. Ichthyostegia is connecting link between Fish &...
Correct option:(4) Yolk-sac Solution: Oogonia arise form the endoderm of the yolk sac and migrate to ovaries during embryonic development.
Correct option:(2)Fatty acids and glycerol Solution: Lacteals absorb Fatty acids and glycerol A lacteal is a lymphatic capillary that absorbs dietary fats in the villi of the small intestine....
(1) L (2) M (3) N (4) O Correct option :(3) N Solution: Blood is filtered from Glomerulus. In the diagram 'N' is the Glomerulus. L-Aerent arteriole, M-eerent arteriole. O-Neck of Bowman's...
Correct option:(2)Calcium oxalate, calcium phosphate Solution: Several types of kidney stones based on type of crystals of which they consist. The majority are calcium oxalete stones, followed by...
Correct option:(1)1 to 4 Solution: In each testis, there are 200 - 300 lobules. In each lobule there are 1-4 convoluted loops called seminiferous tubules.
Correct option:(2) Based on fingerprints of individual Solution: DNA fingerprinting is not based on fingerprints of individual.
Correct option:(3)Isinglass Solution: Lac is used in the manufacture of Toys, Polish, Ink etc.
Correct option:(3)Penguin, Spider, Scorpion Solution: Spiders, Scorpions, and Penguins excrete mostly guanine and hence are called guanotelic.
Correct option:(2) Epithelial Solution: Epithelial tissue lacks blood vessels and hence is an avascular tissue.
Correct option:(3)Emphysema Solution: Transgenic animals would be useful as bioreactors to produce important proteins such as α - 1 antitrypsin. This is used to treat emphysema
Correct option:(1)Secretory phase Solution: In the secretory / luteal phase, corpus luteum secretes large amount of progesterone.
Correct option:(4)Short generation time Solution: Transgenic animals are animals (most commonly mice) that have had a foreign gene deliberately inserted into their genome. Such animals are most...
Correct option:(4)Volkmann's canal Solution: Two adjacent Haversian systems are connected by Volkmann's canal.
Correct option:(1)Arbor vitae Solution: Arbor vitae (tree of life) is the cerebellar white matter, so called for its branched, tree like appearance. It resembles a fern and is present in both...
Correct option:(2)Planaria Solution: Planaria have the ability to give rise to new individuals from their body parts. Process is called regeneration. If the body of Planaria is somehow cut or broken...
Correct option:(2) Aerial Solution: Pneumatic bones and le sided ovary is characteristic feature of Aerial adaptation.
Correct option:(1)Cirrhina Solution: Cirrhina is fresh water fish. Herpedon, Sardinella, and Rastrelliger are maine fishs.
Correct option:(4)Papaver somniferum Solution: Heroin is extracted from Papaver Somniferum
Correct option:(3)The upper branch of bifurcated connective bears sterile anther lobe and lower branch bears fertile anther lobe Solution: Upper branch of bifurcated connective bears sterile anther...
Correct option:(4)H1 Solution: H1 histone is present in the linker region. In the nucleosome, two molecules of each of H2A, H2B, H3 and H4 are present to form octamer.
Correct option:(3) Incomplete dominance Solution: Snapdragon is an example of incomplete dominance in genetics.
Correct option:(4) Respiration Solution: Oxidative phosphorylation in eukaryotes occurs during respiration (Glycolysis). In oxidative pay off phase of glycolysis in which PGAL undergoes oxidation...
Correct option:(A)Lillium Solution: Double fertilization in angiosperms was first discovered by S.G. Nawaschin in Lillium plants.
The correct answer is Option B 1981. This is because - The Air Pollution Prevention and Control Act was passed in India in 1981, but it was revised in 1987 to include noise as an air contaminant.
The correct answer is Option A Reducing deforestation, cutting down the use of fossil fuel. This is because - Cutting down on the use of fossil fuels, improving energy efficiency, reducing...
The correct answer is Option B Symbiosis. This is because - A stationary sea anemone attaching itself to the hermit crab's shell lining is an example of symbiosis, in which the sea anemone grows on...
The correct answer is Option A Fragmentation – carried out by organisms such as earthworms. This is because - Detritivores, such as earthworms, carry out the fragmentation process. Humification...
The correct answer is Option D Zero. This is because - The density of a population in a specific environment fluctuates over time due to changes in four basic processes, two of which (natality and...
The correct answer is Option A Methane, hydrogen sulphide, carbon dioxide. This is because - Biogas is a mixture of gases formed during the breakdown of biomass in the absence of oxygen, primarily...
The correct answer is Option D Germplasm collection. This is because - A prerequisite for optimal use of natural genes accessible in populations is the collection and preservation of all distinct...
The correct answer is Option A T- lymphocytes. This is because - T- lymphocytes, highly specialised cells that recognise 'non-self' and'self' cells, are responsible for cell-mediated immunity in the...
The correct answer is Option A Drinking water containing eggs of Ascaris. This is because - Ascaris infection is spread through the consumption of polluted water, vegetables, and fruits that contain...
The correct answer is Option C Analogous organs that have evolved due to convergent evolution. This is because - Organs that perform the same job but differ in origin and structure are referred to...
The correct option is Option B Intraspecific competition. This is because - According to Darwin, organic evolution is due to intraspecific competition which is an interaction in which members of the...
The correct option is Option A β- galactosidase. This is because - Non-functional permease will result from a non-sense mutation in the lac Y gene, and a stop codon will be added to the sequence...
The correct answer is Option C A – Transcription, B - Translation, C - Francis Crick. This is because - Francis Crick proposed the central dogma in molecular biology, which states that the genetic...
The correct answer is Option C 25 %. This is because - The genotype of husband for thalassemia is XTX and the genotype for carrier women is XTX.
The correct answer is Option C It is a dominant disease. This is because - Haemophilia is a sex-linked recessive disorder caused by a mutation in a single protein that is part of a cascade of...
The correct answer is Option D Co-dominance. This is because - When both alleles of a pair are completely expressed in a heterozygote, it is said that the genes and traits are codominant. As a...
The correct answer is Option C Artificial introduction of sperms of a healthy donor into the vagina. This is because - Artificial insemination is the process of introducing sperm from the husband or...
The correct option is Option D Jaundice. This is because - Amniocentesis is a foetal sex determination technique that uses the chromosomal pattern in the amniotic fluid around the growing embryo to...
The correct option is Option B By abstaining from coitus from day 10 to 17 of the menstrual cycle. This is because - Periodic abstinence is a practise in which couples avoid or abstain from coitus...
The correct option is Option D Secretes oxytocin during parturition. This is because - The placenta serves the following purposes: i. Allows the embryo to receive oxygen and nutrition; ii. Secretes...
The correct option is Option A Progesterone. This is because -If fertilisation fails, the ovary's corpus luteum degenerates, and progesterone and oestrogen release is stopped, resulting in a new...
Correct Option D. The sperm mother cells divide frequently through mitotic divisions to generate spermatogonia during the multiplicative phase of spermatogenesis. The spermatogonia develop in size...
The correct answer is Option C. This is because - Anterior pituitary produces growth hormone (GH). Posterior pituitary stores and releases two hormones called oxytocin and vasopressin. Corpus luteum...
The correct answer is Option C Non-nutrient chemicals produced by the body in trace amounts that act as intercellular messengers are known as hormones. This is because - Hormones are non-nutrient...
The correct answer is Option A A - Retina – contains photo receptors rods and cones. This is because - Retina contains two types of photoreceptor cells, rods and cones which contain the...
The correct answer is Option A A – Receptor, C – Synaptic vesicles This is because - When an impulse reaches the axon terminal, it causes synaptic vesicles to migrate towards the membrane, where...
The correct answer is Option C. This is because - The presence of a fluid-filled synovial space between the articulating surfaces of two bones distinguishes synovial joints. Between the atlas and...
The correct answer is Option B Accumulation of uric acid crystals in joints causes their inflammation. This is because - Inflammation of joints due to accumulation of uric acid crystals is called...
Correct Option A The front part of each kidney houses the adrenal gland. The adrenal medulla secretes two hormones, adrenaline or epinephrine, and nor-adrenaline or nor-epinephrine, which are both...
Correct Option A. The P-wave depicts the atria's electrical stimulation (or depolarization), which causes both atria to constrict.
The correct answer is Option C. This is because - Blood from the pulmonary veins and vena cava flows into the left and right ventricles via the left and right atria as the tricuspid and bicuspid...
The correct answer is Option C. This is because - A - The tracheae is a lengthy tube with incomplete cartilaginous rings supporting it. B - The thoracic lining is in close touch with the outer...
The correct answer is Option A Deficiency of iodine in diet. This is because - Deficiency of iodine in our diet results in hypothyroidism and enlargement of the thyroid gland, commonly called goitre...
The correct option is A. This is because - Small intestine is the principal organ for absorption of nutrients where the final products of digestion such as glucose, fructose, fatty acids, glycerol...
The correct answer is Option A Telophase Nuclear envelope reforms, Golgi complex reforms. This is because- Telophase shows the following key events: i. Chromosomes cluster at opposite spindle poles...
The correct answer is Option D Vitamins. This is because- The essential chemical components of many coenzymes are vitamins, e.g., coenzyme nicotinamide adenine dinucleotide (NAD) and NADP contain...
The correct answer is Option A Nitrogen containing polysaccharide. This is because - Chitin is a polysaccharide composed of a nitrogen containing glucose derivative known as N-acetyl glucosamine.
The correct option is Option D Rough endoplasmic reticulum, protein synthesis. This is because - Rough endoplasmic reticulum proteins and smooth endoplasmic reticulum lipids both reach the Golgi...
The correct answer is Option C Both forewings and hindwings develop. This is because - The nymph develops into an adult after moulting 13 times. Wing pads are present in the next to last nymphal...
The correct answer is Option C The central gap between actin filaments extending through myosin filaments in the A-band. This is because - A considerably less dark zone known as the H-zone exists in...
The correct answer is Option B Silverfish. This is because - Cuttlefish belongs to Phylum Mollusca. Silverfish belongs to Phylum Arthropoda. Pufferfish and flying fish belong to Phylum Chordata.
The correct answer is Option C Prawn, Scorpion, Locusta. This is because - Prawn, Scorpion, Locusta are examples of phylum Arthropoda.
The correct answer is Option C House fly, butterfly, tsetsefly, silverfish-Insecta. This is because - House fly, butterfly, tsetsefly, silverfish belongs to Phylum Insecta/Arthropoda which includes...
The correct answer is This is because - Petromyzon is an ectoparasite on some fishes and belongs to class Cyclostomata. Hence, option A is the correct option.
The correct answer is Option C Fungi. This is because - Fungi represents maximum number of species among global biodiversity.
The correct option is Option A CoP-3. This is because - The Kyoto Protocol was adopted at the third session of the Conference of Parties to the UNFCCC, COP-3 in 1997 in Kyoto, Japan.
The correct answer is Option C Shifting cultivation. This is because - Ex-situ conservation includes field gene banks, seed banks and botanical gardens. Shifting cultivation is not used for ex situ...
The correct answer is Option C Consumers. This is because - Primary productivity is determined by the producers that live in a given area. Secondary productivity, on the other hand, is the pace at...
The correct answer is Option C Rocks. This is because - The largest reservoir of phosphorus is in sedimentary rocks..
The correct answer is Option A Archaebacteria. This is because Archaebacteria are distinguished from other bacteria by the presence of branched chain lipids in their cell membrane, which allows them...
The correct answer is Option C Insertional inactivation of alpha-galactosidase in recombinant bacteria. This is because - Lysozyme breaks down bacterial cell walls. Cellulase is a...
The correct answer is Option C Algae - Methylase. This is because - Bacterial cell walls are destroyed by lysozyme. Cellulase is an enzyme that breaks down cellulose in plant cell walls. In fungus,...
The correct answer is Option C Electrophoresis. This is because - DNA fragments formed by restriction endonucleases in a chemical reaction can be separated by gel electrophoresis using an agarose...
The correct answer is Option A Aspergillus. This is because - Aspergillus niger (a fungus) is a producer of citric acid.
The correct answer is Option B Cotton. This is because - The Bt toxin gene has been cloned from bacteria and expressed in plants in Bt crops to give insect resistance without the use of...
The correct answer is Option D Lack of random mating. This is because - Allele frequencies in a population are stable and constant from generation to generation, hence the gene pool remains...
The correct answer is Option D Lack of random mating. This is because - Allele frequencies in a population are stable and constant from generation to generation, hence the gene pool remains...
Correct option: (4)Decarboxylation Solution: Oxalosuccinate is converted into α-ketoglutarate by oxidative decarboxylation during Kreb’s cycle.
Correct option:(2)Imbibition Solution: Imbibition is an adsorption of water by hydrophilic compounds like cellulose and pectine in root hair cell wall.
Correct option :(A)(1) Leaf curl and chilli mosaic virus Solution: ‘Pusa Sadabhar’ is resistance to disease leaf curl and chilli mosaic virus of chilli. Himgiri of wheat is resistance to leaf and...
Correct option: (4)Hyaluronic acid Solultion: Hyaluronic acid is a hetropolysaccharide. It is made up of glucuronic acid and N acetyl-D-glucosamine disaccharide units.
Correct option:(1)Cambia of both stock and scion fuse together Solution: Cambium is essential for grafting in plants because cambia is consists of meristematic cells of stock and scion fuse...