Botany
- Match List I with List II.List I: A. Logistic growth; B. Exponential growth; C. Expanding age pyramid; D. Stable age pyramidList II: I. Unlimited resource availability condition; II. Limited resource availability condition; III. The percent individua… Answer: 2. A-II, B-I, C-III, D-IV Key idea: Link each growth form or pyramid to its condition. Logistic growth: limited resources (II). Expo... 1
- Broad palm with single palm crease is visible in a person suffering from- Answer: 2. Down's syndrome Key idea: Down's syndrome (trisomy 21) has typical physical features. These include a short stature, a small roun... 1
- Which one of the following symbols represents mating between relatives in human pedigree analysis? Answer: 3. [pedigree symbol: square joined to circle by double line] Key idea: In a human pedigree, a double horizontal line between the mal... 1
- Which one of the following statements is NOT correct? Answer: 3. Algal blooms caused by excess of organic matter in water improve water quality and promote fisheries. Key idea: Algal blooms caus... 1
- Which of the following are NOT considered as the part of endomembrane system?A. MitochondriaB. Endoplasmic ReticulumC. ChloroplastsD. Golgi complexE. PeroxisomesChoose the most appropriate answer from the options given below: Answer: 3. A, C and E only Key idea: The endomembrane system includes organelles whose functions are coordinated: ER, Golgi complex, lysosom... 1
- Melonate inhibits the growth of pathogenic bacteria by inhibiting the activity of Answer: 2. Succinic dehydrogenase Key idea: Malonate (written "melonate" in the question) is a competitive inhibitor of succinic dehydrogena... 1
- Given below are two statements:Statement I: Low temperature preserves the enzyme in a temporarily inactive state whereas high temperature destroys enzymatic activity because proteins are denatured by heat.Statement II: When the inhibitor closely rese… Answer: 2. Both Statement I and Statement II are true. Key idea: Both statements are standard facts about enzymes. Statement I is true: low... 1
- How many different proteins does the ribosome consist of? Answer: 2. 80 Key idea: A ribosome is made of rRNA and about 80 different proteins. This is the figure used in NCERT, so the answer is 80. O... 1
- Match List I with List II :List I (Interaction) | List II (Species A and B)A. Mutualism | I. +(A), O(B)B. Commensalism | II. -(A), O(B)C. Amensalism | III. +(A), -(B)D. Parasitism | IV. +(A), +(B)Choose the correct answer from the options given below… Answer: 3. A-IV, B-I, C-II, D-III Key idea: Use the signs for effect on species A and B. Mutualism: +, + (IV). Commensalism: + for A, 0 for... 1
- Given below are two statements :Statement I : Gause's 'Competitive Exclusion Principle' states that two closely related species competing for the same resources cannot co-exist indefinitely and competitively inferior one will be eliminated eventually… Answer: 4. Statement I is correct but Statement II is false. Key idea: Statement I is Gause's principle, which is correct. Statement II is f... 1
- Match List I with List II.List I (Interacting species): A. A Leopard and a Lion in a forest/grassland; B. A Cuckoo laying egg in a Crow's nest; C. Fungi and root of a higher plant in Mycorrtizae; D. A cattle egret and a Cattle in a fieldList II (Name… Answer: 2. A-I, B-II, C-III, D-IV Key idea: Identify the type of interaction in each case. Leopard and lion share prey: competition (I). Cuc... 1
- Match List I with List II.List I: A. Gene 'a'; B. Gene 'y'; C. Gene 'i'; D. Gene 'z'List II: I. β-galactosidase; II. Transacetylase; III. Permease; IV. Repressor proteinChoose the correct answer from the options given below: Answer: 3. A-II, B-III, C-IV, D-I Key idea: In the lac operon, each gene codes for a specific protein. Gene i codes for the repressor protei... 1
- Which of the following statements are correct about Klinefelter's Syndrome?A. This disorder was first described by Langdon Down (1866).B. Such an individual has overall masculine development. However, the feminine development is also expressed.C. The… Answer: 4. B and E only Key idea: Klinefelter's syndrome has the karyotype 47, XXY. A is wrong: Langdon Down described Down syndrome. B is c... 1
- Match List I with List II :List I | List IIA. Cohesion | I. More attraction in liquid phaseB. Adhesion | II. Mutual attraction among water moleculesC. Surface tension | III. Water loss in liquid phaseD. Guttation | IV. Attraction towards polar surfac… Answer: 2. A-II, B-IV, C-I, D-III Key idea: Match each term with its meaning. Cohesion: mutual attraction among water molecules (II). Adhesi... 1
- Match List I with List II :List I | List IIA. Oxidative decarboxylation | I. Citrate synthaseB. Glycolysis | II. Pyruvate dehydrogenaseC. Oxidative phosphorylation | III. Electron transport systemD. Tricarboxylic acid cycle | IV. EMP pathwayChoose th… Answer: 1. A-II, B-IV, C-III, D-I Key idea: Match the process with its enzyme or pathway. Oxidative decarboxylation: pyruvate dehydrogenase... 1
- Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R :Assertion A : A flower is defined as modified shoot wherein the shoot apical meristem changes to floral meristem.Reason R : Internode of the shoot… Answer: 2. Both A and R are true and R is the correct explanation of A. Key idea: A flower is a modified shoot in which the shoot apical mer... 1
- The process of appearance of recombination nodules occurs at which sub stage of prophase I in meiosis? Answer: 3. Pachytene Key idea: Recombination nodules appear during pachytene, when crossing over takes place between non-sister chromatids o... 1
- Among eukaryotes, replication of DNA takes place in - Answer: 3. S phase Key idea: DNA replication in eukaryotes takes place in the S (synthesis) phase of interphase. G1 is for cell growth, G2 f... 1
- Match List I with List II :List I | List IIA. M Phase | I. Proteins are synthesizedB. G_2 Phase | II. Inactive phaseC. Quiescent stage | III. Interval between mitosis and initiation of DNA replicationD. G_1 Phase | IV. Equational divisionChoose the c… Answer: 4. A-IV, B-I, C-II, D-III Key idea: Match each phase with its feature. M phase: equational division (IV). G2 phase: proteins are syn... 1
- Movement and accumulation of ions across a membrane against their concentration gradient can be explained by Answer: 1. Active Transport Key idea: Movement of ions against their concentration gradient needs energy (ATP) and carrier proteins, and thi... 1
- Identify the pair of heterosporous pteridophytes among the following : Answer: 3. Selaginella and Salvinia Key idea: Heterosporous pteridophytes make two kinds of spores (micro and megaspores). Selaginella and S... 1
- Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R :Assertion A : In gymnosperms the pollen grains are released from the microsporangium and carried by air currents.Reason R : Air currents carry the… Answer: 4. A is true but R is false. Key idea: In gymnosperms the pollen grains are carried by air currents, but they do form a pollen tube.... 1
- The historic Convention on Biological Diversity, 'The Earth Summit' was held in Rio de Janeiro in the year : Answer: 3. 1992 Key idea: The Earth Summit (Convention on Biological Diversity) was held at Rio de Janeiro in 1992. The 2002 summit was held... 1
- In the equationGPP - R = NPPGPP is Gross Primary ProductivityNPP is Net Primary ProductivityR here is ______. Answer: 4. Respiratory loss Key idea: Net primary productivity is the gross primary productivity left after plants use some for their own re... 1