Botany
- Identify the correct statement with regard to G_1 phase (Gap 1) of interphase. Answer: 3. Cell is metabolically active, grows but does not replicate its DNA. Key idea: G₁ is the growth phase before DNA replication. In G... 1
- Which of the following statements about inclusion bodies is incorrect ? Answer: 2. These are involved in ingestion of food particles. Key idea: Inclusion bodies are non-membrane-bound reserve materials lying free... 1
- Which is the important site of formation of glycoproteins and glycolipids in eukaryotic cells ? Answer: 3. Golgi bodies Key idea: Golgi bodies modify and package products from the ER. Proteins and lipids from the ER reach the Golgi, whe... 1
- Which of these following methods is the most suitable for disposal of nuclear waste ? Answer: 4. Bury the waste within rocks deep below the Earth's surface Key idea: Nuclear waste must be stored in a safe, geologically stable... 1
- Which of the following is not an attribute of a population ? Answer: 4. Species interaction Key idea: Attributes of a population are properties of the group as a whole, not of individuals or of interac... 1
- Identify the wrong statement with reference to the gene 'I' that controls ABO blood groups. Answer: 3. When I^A and I^B are present together, they express same type of sugar. Key idea: In AB blood group, I^A and I^B are codominant a... 1
- Select the correct match. Answer: 3. Sickle cell anaemia - Autosomal recessive trait, chromosome-11 Key idea: Recall the mode of inheritance of each disorder. Haemoph... 1
- The process of growth is maximum during : Answer: 1. Log phase Key idea: Growth follows a sigmoid curve and is fastest in the exponential (log) phase. In the lag phase growth is slow... 1
- The plant parts which consist of two generations - one within the other :(a) Pollen grains inside the anther(b) Germinated pollen grain with two male gametes(c) Seed inside the fruit(d) Embryo sac inside the ovule Answer: 4. (a) and (d) Key idea: Two generations one inside the other means a gametophyte developing inside a sporophyte structure, i.e., a... 1
- The roots that originate from the base of the stem are : Answer: 1. Fibrous roots Key idea: Roots arising from the base of the stem are adventitious and, in monocots, form a fibrous root system. In... 1
- Which of the following can be used as a biocontrol agent in the treatment of plant disease ? Answer: 1. textitTrichoderma Key idea: Trichoderma is a fungal biocontrol agent. Trichoderma species control plant pathogens. Chlorella is a... 1
- The concept of "Omnis cellula-e cellula" regarding cell division was first proposed by : Answer: 1. Rudolf Virchow Key idea: Rudolf Virchow proposed "Omnis cellula-e cellula" (new cells come from pre-existing cells) in 1855. Schl... 1
- Which of the following statements is incorrect ? Answer: 3. Infective constituent in viruses is the protein coat. Key idea: In viruses, the infective part is the nucleic acid (genome), not... 1
- Which of the following statements is incorrect ? Answer: 4. Yeasts have filamentous bodies with long thread-like hyphae. Key idea: Yeasts are unicellular, not filamentous. Morels and truffl... 1
- Match Column - I with Column - II.Column - I | Column - II(a) Saprophyte | (i) Symbiotic association of fungi with plant roots(b) Parasite | (ii) Decomposition of dead organic materials(c) Lichens | (iii) Living on living plants or animals(d) Mycorrh… Answer: 4. (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i) Key idea: Match nutrition modes with their meaning. Saprophyte: decomposes dead organic ma... 1
- Pinus seed cannot germinate and establish without fungal association. This is because : Answer: 2. it has obligate association with mycorrhizae. Key idea: Pinus roots have an obligate mycorrhizal association. The fungus helps ab... 1
- Polyblend, a fine powder of recycled modified plastic, has proved to be a good material for : Answer: 3. construction of roads Key idea: Polyblend, made from recycled modified plastic, is used to lay roads. It is mixed with bitumen to... 1
- The frequency of recombination between gene pairs on the same chromosome as a measure of the distance between genes was explained by : Answer: 3. Alfred Sturtevant Key idea: Alfred Sturtevant used recombination frequency as a measure of the distance between genes. Morgan dis... 1
- Match the following genes of the Lac operon with their respective products :(a) i gene (i) β-galactosidase(b) z gene (ii) Permease(c) a gene (iii) Repressor(d) y gene (iv) TransacetylaseSelect the correct option. Answer: 3. (a)-(iii), (b)-(i), (c)-(iv), (d)-(ii) Key idea: Lac operon: i gene codes for repressor; z for beta-galactosidase; y for permease... 1
- Expressed Sequence Tags (ESTs) refers to : Answer: 1. Genes expressed as RNA Key idea: ESTs identify genes that are expressed as RNA. In the genome-sequencing approach, one method seq... 1
- What is the genetic disorder in which an individual has an overall masculine development, gynaecomastia, and is sterile ? Answer: 2. Klinefelter's syndrome Key idea: Klinefelter's syndrome is XXY. The individual is male with overall masculine development but als... 1
- Which of the following features of genetic code does allow bacteria to produce human insulin by recombinant DNA technology ? Answer: 3. Genetic code is nearly universal Key idea: The universality of the genetic code lets one organism read another's genes. Since the... 1
- Under which of the following conditions will there be no change in the reading frame of following mRNA ?5' AACAGCGGUGCUAUU 3' Answer: 4. Deletion of GGU from 7 ^th , 8 ^th and 9 ^th positions Key idea: A change that adds or removes a multiple of 3 bases keeps the re... 1
- It takes very long time for pineapple plants to produce flowers. Which combination of hormones can be applied to artificially induce flowering in pineapple plants throughout the year to increase yield ? Answer: 1. Auxin and Ethylene Key idea: Auxin and ethylene induce flowering in pineapple. Auxins (like NAA) and ethylene (ethephon) promote... 1