Biology Section 12

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• Kidney is responsible for blood filtration.
• Liver is responsible for body metabolism.
• The part of the brain that connects the two hemispheres is called the Corpus callosum.
• Cell organelles are formed in the G2 Phase of the cell cycle.
• Vacuoles are fluid-filled sacs surrounded by a membrane called tonoplast.
• During cell division, the nucleus divides first.
• Chloroplast manufactures carbohydrates by photosynthesis.
• Ribosomes are called protein-synthesizing machines.
• Cell wall is the non-living outermost boundary of all the above cells.
• The light microscope can make the object 1000 times bigger.
• The utilization of the products of digestion is called assimilation.
• A kangaroo has an abdominal pouch known as a marsupial.
• Earthworm lives in moist soil.
• Sickle cell anemia was discovered by Vernon Ingram.
• The rich source of energy in semen is glucose.
• The fetus is protected from mechanical damage by amniotic fluid.
• The release of the ovum from the ovary is called ovulation.
• Detachment of myosin head and actin in rigor mortis occurs due to hyperactivity of mitochondria.
• The clavicle bone is called the beauty bone in women.
• Plants that produce embryos but lack vascular tissues and seeds are placed in bryophytes.
• Higher vascular plants are also called seed plants.
• In all coelenterates, endoderm gives rise to the digestive system.
• Liver fluke is a parasite in the liver of cattle, sheep, and goats.
• Amoeba moves in water with the help of locomotory organs called pseudopodia.
• Snails belong to the gastropods.
• The body of organisms in phylum Arthropoda is usually divided into head, thorax, and abdomen.
• In humans, influenza is caused by viruses.
• Non-enveloped naked viruses are known as virions.
• Gram +ve bacteria on treatment with crystal violet dye give the purple colour.
• Malarial parasite is injected into man as sporozoites.
• The terms procariotique and eucariotique were proposed by Chatton.
• Outside the thallus of Marchantia, there are special structures called rhizoids.
• The vascular plants are termed as tracheophytes.
• Tobacco mosaic virus was crystallized by Stanely.
• Flagella are composed of microtubules.
• The life and activities of a cell are controlled by the nucleus.
• Accumulation of lipid molecules in brain cells leads to mental retardation.
• Accumulation of lipid molecules in brain cells leads to mental retardation.
• The simplest amino acid is glycine.
• Leucoplasts are present in the underground parts of plants and store food.
• Waxes are widespread as protective coatings on fruits and leaves.
• Meningitis is a very serious disease of the brain caused by fungi.
• Many bacteria in our digestive system synthesize vitamin B12.
• Insects are not vertebrates.
• The appendix is the less important organ in the human body.
• Gregor Mendel is known as the father of Genetics.
• HCV is the most contagious type of hepatitis.
• Biology is the branch of science short in laws.
• Hypoxia refers to a decrease of oxygen to the tissue despite adequate blood flow.
• Insulin is a human protein.
• Amoeba secretes digestive enzymes to hydrolyze starch, sugar, proteins, and fats.
• The number of daughter paramecia produced following conjugation is 8 from two conjugants.
• Corolla and calyx collectively termed as se*ual whorls.
• Sporogony of the malaria parasite occurs in the stomach wall of the mosquito.
• Under unfavorable conditions, Amoeba reproduces by encystment.
• Mild tertian malaria is caused by Plasmodium vivax.
• Blood does not coagulate inside the body due to the presence of heparin.
• Blood is referred to as fluid tissue.
• Sweat glands occur in the greatest number in the skin of the armpits.
• Oxytocin is a protein hormone.
• Vitamin known as the “anti-Sterile” factor is Ascorbic acid.
• Vitamin useful in ostcoimalacia is Vitamin D.
• Human body makes about 20 million erythrocytes in one second.
• Ingestion of bacteria by certain type of cells is termed as Phagocytosis.
• Expected number of RBCs in a single drop of blood in Women is 4.0 to 5.2 million.
• Normal range of white blood cells in a microliter of blood is between 4,500 and 10,000.
• Expected number of RBCs in a single drop of blood in Men is 4.5 to 6.2 million.
• Parkinson’s disease is a disease of the Brain.
• Acetabularia is a kind of Unicellular alga.
• Acetabularia mediterranea has a cap of Regular shape.
• Hibernation and aestivation are Thermal adaptations shown by animals.
• Enzyme activity can also be charted through the Rate of reaction.
• BOD refers to Biochemical Oxygen demand.
• Self-pollination is not possible in Dioecious plants and Pawpaw.
• “lub” sound is produced after the bicuspid and tricuspid valves suddenly close.
• Examples of Epigeal germination include Sword bean seed.
• All are functions of hypothalamus, but Regulation of anti-diuretic hormones.
• More water is reabsorbed in blood due to more anti-diuretic hormone.
• Sessile flowers have no pedicles.
• Stamens are not usually pendulous in plants pollinated by Insects.
• Guard cells of stoma are kidney-shaped.
• Special kind of protein containing iron is called Hemoglobin.
• Zygote with three copies of chromosome 21 is known to cause Downs syndrome.
• Kind of respiration through which skeletal muscles of the human body get energy is Anaerobic respiration.
• Fuel used by cells in cellular respiration to get energy is Glucose.
• Kind of cellular respiration which occurs in the presence of oxygen is Aerobic respiration.
• Special enzymes are released during necrosis from lysosomes.
• Number of cells that are destroyed in adults by apoptosis is 50 to 70 billion cells.
• Biebs that are broke off from cells are called Apoptotic bodies.
• Chrysanthemum is propagated by Suckers.
• Outer surface of bones is covered by a dense layer of connective tissue, called Periosteum.
• Another name for liver is called Hepar.
• Joints between flat bones of the skull are termed as Suture and Sutural joints.
• Length of membranous urethra is about 1 cm.
• Division of the nucleus is termed as Karyokinesis.
• Membrane that separates ‘cytoplasm’ and ‘nucleus’ is called Nuclear envelope.
• Species occupation is referred to as Niche.
• The first-ever vascular plants are Cooksonia.
• Circular disc-shaped structure with a round hole is Iris.
• Higher animals have special organs for exchange of gases as their skin is Thick.