#neet
- 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 product(s) of reaction catalyzed by nitrogenase in root nodules of leguminous plants is/are : Answer: 4. Ammonia and hydrogen Key idea: Nitrogenase reduces nitrogen to ammonia and releases hydrogen. The reaction is N₂ + 8e^- + 8H^+ +... 1
- 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
- Cuboidal epithelium with brush border of microvilli is found in : Answer: 3. proximal convoluted tubule of nephron Key idea: Brush-border cuboidal epithelium is found where absorption and secretion occur. I... 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
- In gel electrophoresis, separated DNA fragments can be visualized with the help of : Answer: 2. Ethidium bromide in UV radiation Key idea: DNA in agarose gels is stained with ethidium bromide and viewed under UV light. Ethidi... 1
- Select the hormone-releasing Intra-Uterine Devices. Answer: 3. Progestasert, LNG-20 Key idea: Hormone-releasing IUDs are progestogen releasing. Progestasert and LNG-20 release progestogen (lev... 1
- A gene locus has two alleles A, a. If the frequency of dominant allele A is 0.4, then what will be the frequency of homozygous dominant, heterozygous and homozygous recessive individuals in the population ? Answer: 3. 0.16 (AA); 0.48 (Aa); 0.36 (aa) Key idea: Hardy-Weinberg: p² + 2pq + q² = 1 . p = 0.4 , so q = 1 - 0.4 = 0.6 . AA = p² = 0.16 ; A... 1
- Which of the following is true for Golden rice ? Answer: 1. It is Vitamin A enriched, with a gene from daffodil. Key idea: Golden rice is a biofortified rice rich in provitamin A (beta-caro... 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
- 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
- Which of the following sexually transmitted diseases is not completely curable ? Answer: 3. Genital herpes Key idea: Bacterial STDs are curable with antibiotics; viral ones are not completely curable. Gonorrhoea and chlam... 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
- Match the following organisms with their respective characteristics :(a) Pila (i) Flame cells(b) Bombyx (ii) Comb plates(c) Pleurobrachia (iii) Radula(d) Taenia (iv) Malpighian tubulesSelect the correct option from the following : Answer: 2. (a)-(iii), (b)-(iv), (c)-(ii), (d)-(i) Key idea: Match each animal with its characteristic organ. Pila (mollusc): radula, (iii).... 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
- 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
- Which of the following glucose transporters is insulin-dependent ? Answer: 4. GLUT IV Key idea: GLUT4 is the insulin-regulated glucose transporter. GLUT4 is found in skeletal muscle and adipose tissue; insul... 1
- Which of the following immune responses is responsible for rejection of kidney graft ? Answer: 4. Cell-mediated immune response Key idea: Graft rejection is a cell-mediated response. T-lymphocytes recognise the foreign tissue a... 1
- Use of an artificial kidney during hemodialysis may result in :(a) Nitrogenous waste build-up in the body(b) Non-elimination of excess potassium ions(c) Reduced absorption of calcium ions from gastro-intestinal tract(d) Reduced RBC productionWhich of… Answer: 3. (c) and (d) are correct Key idea: Dialysis removes wastes, but cannot replace endocrine functions of the kidney. (a) and (b) are... 1
- Which of the following statements is correct ? Answer: 4. Cornea consists of dense matrix of collagen and is the most sensitive portion of the eye. Key idea: The cornea is made of dense c... 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