Category: Sciences

20 Questions with Answers and Explanations on “Evolution” for Biology Students: Image Source: charleyharperprints.comQ. 1. When did the life appear on earth? Ans. Life appeared almost 4 billion years ago. ADVERTISEMENTS: Q. 2. Which theory of origin of life is accepted by scientists? Who proposed it? Ans. Chemical evolution by Oparin and Haldane.Q.3. What are fossils? ADVERTISEMENTS: Ans. The remains of hard parts/impressions of life forms found on rocks is called fossil.Q. 4. Illustrate an example to divergent evolution. Ans. The presence of forelimbs with similar anatomical structure in different organisms is divergent evolution.Q. 5. Give one example to homology in plants with names. ADVERTISEMENTS: Ans. Thorn and tendril of Bougainvillea and Cucurbita.Q. 6. What is convergent evolution? Ans. Organs that perform similar function but are anatomically different shows convergent…

11 Questions with Answers and Explanations on “Organism and Populations” for Biology Students: Image Source: classconnection.s3.amazonaws.comQ. 1. Define the terms—eurythermal, stenothermal. Ans. Organisms that can tolerate a wide range of temperature are called eurythermals. ADVERTISEMENTS: Organisms that can tolerate narrow range of temperatures are called stenothermals.Q. 2. Why are plants and animals dependent on light?Ans. Plants are dependent on light for: ADVERTISEMENTS: (1) Photosynthesis.(2) Photoperiodism—for flowering.(3) Formation of chlorophyll.Animals are dependent on light for: ADVERTISEMENTS: (1) Photoperiodism—foraging, reproductive and migratory activities.Q. 3. What is adaptation? Why do animals/plants adapt? Ans. Any change of the organism that enables the organism to survive and reproduce in its habitat is called adaptation.It is done for reproduction i.e. to increase its population (r) and survival.Q. 4. What are behavioral responses or adaptations? Give one…

18 Questions with Answers and Explanations on “Principles of Inheritance” for Biology Students: Image Source: yourarticlelibrary.comQ.1. Mention the advantages of selecting pea plant for experiment by Mendel. Ans. ADVERTISEMENTS: Advantages are. (a) Pea plant shows self pollination.(b) It shows stable trait inheritance. ADVERTISEMENTS: (c) The expression of traits is for several generations.(d) The plants selected were true breeding.Q.2. (a) What is Punnett square? (b) Mention its one use. ADVERTISEMENTS: Ans.(a) It is a graphical representation to calculate the probability of all possible genotypes of offspring is a genetic cross.(b) It is used to represent the possible genotypes of offspring of a genetic cross.Q.3. Define and design a test-cross. Ans. The cross which helps us to determine the unknown genotype of a dominant phenotype by crossing it with the recessive parent…

15 Questions with Answers and Explanations on “Applications of Biotechnology” for Biology Students: Image Source: frontiersin.orgQ. 1. Expand and define the term GMO. Ans. GMO: ADVERTISEMENTS: Genetically modified organisms.Organisms whose genes have been altered by manipulation are called GMO.Q. 2. Mention any two usefulness of GM plants. ADVERTISEMENTS: Ans. 1. GM plants are more tolerant to abiotic stresses such as temperature, salt etc.2. GM plants are pest resistant.Q. 3. Mention the source of Bt gene. What for it is used? Ans. The source of Bt gene is bacillus thuringiensis. ADVERTISEMENTS: It is used for making bio-pesticide (pest resistant plants)Q. 4. Give two examples to Bt crops.Ans. Bt cotton, Bt corn.Q. 5. What is cry? Ans. Cry is the gene of Bt that codes for toxin. Q. 6. What is the…

Image Source: mcg-qna.s3.amazonaws.com15 Questions with Answers and Explanations on “Biotechnology” for Biology Students:Q. 1. Define biotechnology according to European Federation of Biotechnology (EFB). Ans. According to EFB—biotechnology is the integration of natural science and organisms, cells, parts thereof, and molecular analogues for products and service. ADVERTISEMENTS: Q. 2. Define genetic engineering. Ans. The techniques used to alter the chemistry of the genetic material to introduce these into the host organisms in order to change the phenotype of the host is called as genetic engineering.Q. 3. What is cloning? ADVERTISEMENTS: Ans. The process of making multiple copies to without the involvement of reproductive process is called cloning.Q. 4. Name the first restriction endonuclease. Ans. Hind II.Q. 5. Give one example to restriction endonuclease. ADVERTISEMENTS: Ans. EcoRl.Q. 6. To which class do…

21 Questions with Answers and Explanations on “Inheritance in Human” for Biology Students: Image Source: bdb3b8.medialib.glogster.comQ. 1. What is the basis of DNA length? Ans. It depends on the number of nucleotide pairs present in it. ADVERTISEMENTS: Q. 2. Name the molecules that form the backbone of polynucleotide chain. Ans. (1) Sugar(2) Phosphate. ADVERTISEMENTS: Q. 3. What are the ratios between Adenine and Thymine and Guanine and Cytosine? Ans. It is constant and equals to one.Q. 4. Who identified the acidic nature of deoxyribose nucleic acid?Ans. Friendrich Meischer. ADVERTISEMENTS: Q. 5. Who proposed the central dogma of molecular biology? Ans. Francis Crick.Q. 6. What is central dogma in molecular biology? Ans. The flow of information from DNA -» RNA -> Protein is called central dogma in molecular biology.Replication—– transcription translation…

20 Questions with Answers and Explanations on “Reproduction in Organisms” for Biology Students: Image Source: classconnection.s3.amazonaws.com Smock > Flashcards > Week 5: Mitosis/Meiosis …”/>Q. 1. Name the period from birth to the natural death of an organism. Ans. Life span. ADVERTISEMENTS: Q. 2. Which types of organisms are immortal? Multicellular or single cellular organisms? Ans. Single cellular organisms.Q. 3. Why is reproduction essential for organisms? ADVERTISEMENTS: Ans. Reproduction is essential for organism because it enables the continuity of the species, generation after generation.Q. 4. Why is the offspring formed by asexual reproduction referred to as clone? Ans. It is referred to as ‘clone’ because the offspring is morphologically and genetically identical to the parent.Q. 5. Mention the mode of reproduction in protists and monerans. ADVERTISEMENTS: Ans. Cell division.Q. 6. Name…

22 Questions with Answers and Explanations on “Variation of the Chromosomes in the Human” for Biology Students: Image Source: d6igaq6njxgjh.cloudfront.netQ. 1. Name the process by which the traits (characters) are passed on from parent to progeny. Ans. Inheritance. ADVERTISEMENTS: Q. 2. Define variation. Ans. It is the degree by which progeny differs from their parents.Q.3. Give one example to state that humans knew as early as 8000-1.000 BC the causes of variation and exploited it. ADVERTISEMENTS: Ans. Sahiwal cows in Punjab.Q. 4. What is a true-breeding line? Ans. A true-breeding line is that, which has undergone continuous self pollination (e.g. pea plant) i.e. it is pure and does not have any cross pollination/contamination.Q. 5. What is the phenotypic ratio of monohybrid cross in F2? ADVERTISEMENTS: Ans. 3:1.Q. 6. What is…