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Biology MCOs Based on Class XI NCERT
61. In the human body, to which organ is the appendix attached to? a The large intestine b The small intestine e The gall bladder d) The stomach
Solution: a Explanation The appendix is small tube like structure attached to the first part of the o Explanation: large intestine also called the colon. It is a vestigial organ present in humans.
62. Which of the following is produced by Liver? ) Lipase b Urea o Mucus o Hydrochloric acid
Solution: b Explanation: The liver converts toxins into harmless substances.
63. Which one of the following is not a digestive enzyme in the human body? Trypsin b) Gastrin Ptyalin Pepsin
Solution: b Explanation: Gastrin is a peptide hormone released by pyloric end of the stomach. These induce the secretion of HCI in stomach. HCI kills the microbes from food material
64. Which of the following statement(s) is/are correct? ELISA test is employed as the first and most basic test for an individual to detect cancer. Almost 50% of human beings have Rh-blood. 2. Select the correct answer using the code given below: Only 1 ) Only 2 ) Both 1 and 2 ) Neither 1 nor 2
s Solution: d Explanation Elisa test is for detecting HIV/AIDS 85% of human beings possess Rh-and rest are Rh- : o
65. The hormone Insulin is a? a Glycolipid ) Fatty acid Peptide d) Sterol
Solution: c Explanation : o Insulin is a peptide hormone produced by beta cells of the pancreatic islets. It regulates the metabolism of carbohydrates, fats and protein by promoting the absorption of, especially, glucose from the blood into fat, liver and skeletal muscle cells.
66. Assertion: Fatty acids should be a part of the balanced human diet. Reason: The cells of the human body do not synthesis any fatty acids. Select the correct option: a Both A and R are individually true and R is the correct explanation of A Both A and R are individually true and R is not the correct explanation of A ) A is true but R is false d A is false but R is true
67. Consider the following statements: Femur is the longest bone in the human body. 2 Cholera is a disease caused by bacteria. a Athlete foot is a disease caused by virus. Select the correct answer using the code given below: a 1 and 2 b 2 and 3 1 and 3 o 1, 2 and 3
a Solution: a Explanation Athlete's foot is a fungal infection. Cholera is caused by a bacterium called Vibrio cholerae.
o Solution: b Explanation: Lymphocytes are the smallest of WBC. They are found in large bones and produce antibodies which kill germs called antigens.
o Solution: d Explanation: Octopus is an animal of phylum-Mollusca. Most of the Mollusca have hard shell that protects their soft body although it is missing in octopus.
70. Which organelle in the cell, other than the nucleus, contains DNA? a Centriole b) Golgi apparatus e Lysosome d) Mitochondria
s Solution: d Explanation Both mitochondria and chloroplast in plant cell contain DNA. These organelles synthesize their own food and material partially : o
71. Metastasis is the process by which? a Cells divide rapidly under the influence of drugs. b) Cancer cells spread through the blood. c) moving to the anaphase poles. o Cancer cells are successfully inhibited to divide any further.
o Solution: a Explanation: Ptyalin digest starch. Pepsin digest proteins. Renin converts angiotensinogen in blood into angiotensin. Oxytocin induces contraction of smooth cells.
Solution: b Explanation: Double helix provide stability to it from the degrading enzymes present in cytoplasm.
o Solution: b Explanation: The ribosome attached on the endoplasmic reticulum acts as a protein synthesizing machinery of the cell.
. Solution: a Explanation: Self explanatory
of the faollowing statements 76. Which of the following statements are correct? 1. Tapeworm is Hermaphrodite. 2 Round worm has separate sexes. a Filariasis is caused by a Nematode. 4 Guinea worm is an Annelid. Select the correct answer using the code given below: a 1 and 2 b) 1, 2 and 3 o 3 and 4 2, 3 and 4
o Solution: a Explanation: Example of Keystone species- Fig tree in tropical forest which is important for the survival of other species in the forest.
o Solution: c Explanation: Hemophilia is a genetic disease. Diabetes is a hormonal disorder. Rickets is a deficiency disease. Ringworm is a fungal infection. o .
80. How does the butter gets digested in the stomach? Easternization a) b Peptization Emulsification Metastasis
, Solution: c Explanation: Butter is a fat product and gets digested in the small intestine. The bile juice secreted by the liver contains bile salts that break down large fat globules into smaller globules, so as to increase their surface area for the action of lipase. This process is referred to as emulsification of fats.
81. What will happen in the absence of Hydrochloric Acid (HCI) in the stomach? Trypsin will not be activated. b) P Pepsin will not be activated. e Sugar will not be dissolved. a Dehydration will occur.
86. Match the column 1. Coagulation 2. Universal recipient 3. Resist infections 4. Contraction of heart 5. Gas transport A Eosinophil RBC c AB group o. Platelets E Systole Select the correct answer using the code given below: C. A-2, B-3, C-4, D-1, E-5 ) A-2, B-4, C-3, D-1, E-5 A-3, B-4, C-2, D-1, E-5 A-3, B-5, C-2, D-1, E-4
. Solution: d Explanation: All the given differences are correct.
Solution: c Explanation: In humans, there are four basic types of tissue: epithelial, a o connective, muscular and nervous tissue. Blood is considered a connective tissue for two basic reasons: (1) Embryologically, it has the same origin (mesodermal) as do the other connective tissue types. (2) Blood connects the body systems together bringing the needed oxygen, nutrients, hormones and other signaling molecules and removing the wastes.
90. The Natural pacemaker of heart is? a Sino-atrial node b The atrioventricular (AV) node Heart's ventricles Heart does not have natural pacemaker
o Solution: a Explanation : o The cells that create rhythmic impulses, setting the pace for blood pumping, are called pacemaker cells. In most humans, the concentration of pacemaker cells in the sinoatrial (SA) node is the natural pacemaker and the resultant rhythm is a sinus rhythm