#neet
- Which of the following oxoacid of sulphur has -O-O- linkage ? Answer: 3. H ₂ S ₂ O ₈ , peroxodisulphuric acid The peroxo linkage -O-O- is present in peroxoacids. H₂S₂O₈ (peroxodisulphuric acid, Marshall... 1
- Which of the following amine will give the carbylamine test ? Answer: 1. Aniline (C ₆ H ₅ NH ₂ ) The carbylamine test (heating with CHCl₃ and alcoholic KOH to give a foul-smelling isocyanide) is given o... 1
- The ovary is half inferior in : Answer: 4. Plum The position of the ovary relative to other floral parts decides this. In plum (and rose, peach) the flower is perigynous an... 1
- Strobili or cones are found in : Answer: 4. Equisetum Strobili (cones) are found in Equisetum, a pteridophyte with sporophylls in cones. Salvinia and Pteris have sori or spo... 1
- Identify the correct statement with reference to human digestive system. Answer: 3. Ileum is a highly coiled part. The ileum is the long, highly coiled part of the small intestine. Option 1 is wrong: the ileum ope... 1
- Match the following columns and select the correct option.Column - I | Column - II(a) Clostridium butylicum | (i) Cyclosporin-A(b) Trichoderma polysporum | (ii) Butyric Acid(c) Monascus purpureus | (iii) Citric Acid(d) Aspergillus niger | (iv) Blood… Answer: 2. (a) (ii), (b) (i), (c) (iv), (d) (iii) Match each microbe with its product. Clostridium butylicum produces butyric acid, so (a) -... 1
- Presence of which of the following conditions in urine are indicative of Diabetes Mellitus ? Answer: 3. Ketonuria and Glycosuria Diabetes mellitus shows glycosuria (glucose in urine) and ketonuria (ketone bodies in urine). Because in... 1
- Floridean starch has structure similar to : Answer: 2. Amylopectin and glycogen Floridean starch, the food reserve of red algae, is structurally like amylopectin and glycogen. All thre... 1
- Select the option including all sexually transmitted diseases. Answer: 1. Gonorrhoea, Syphilis, Genital herpes Sexually transmitted diseases include gonorrhoea, syphilis and genital herpes, so option 1 i... 1
- Match the following with respect to meiosis :(a) Zygotene (i) Terminalization(b) Pachytene (ii) Chiasmata(c) Diplotene (iii) Crossing over(d) Diakinesis (iv) SynapsisSelect the correct option from the following : Answer: 2. (a) (iv), (b) (iii), (c) (ii), (d) (i) Link each meiotic prophase I sub-stage to its main event. Zygotene: pairing of homologous... 1
- Which of the following pairs is of unicellular algae ? Answer: 4. Chlorella and Spirulina Chlorella and Spirulina are unicellular and are used as single-cell protein. Laminaria, Sargassum, Gelidi... 1
- Which of the following hormone levels will cause release of ovum (ovulation) from the graffian follicle ? Answer: 1. High concentration of Estrogen Ovulation is triggered by the LH surge in mid-cycle, and that surge is itself caused by a high lev... 1
- Match the following columns and select the correct option.Column - I | Column - II(a) Bt cotton | (i) Gene therapy(b) Adenosine deaminase deficiency | (ii) Cellular defence(c) RNAi | (iii) Detection of HIV infection(d) PCR | (iv) Bacillus thuringiens… Answer: 1. (a) (iv), (b) (i), (c) (ii), (d) (iii) Bt cotton uses a gene from Bacillus thuringiensis for pest resistance: (a) - (iv). Adenosi... 1
- Montreal protocol was signed in 1987 for control of : Answer: 2. Emission of ozone depleting substances The Montreal Protocol (1987) was an international treaty to control emission of ozone depl... 1
- Which of the following is correct about viroids ? Answer: 2. They have free RNA without protein coat. Viroids are free RNA molecules without a protein coat, and are smaller than viruses. The... 1
- The enzyme enterokinase helps in conversion of : Answer: 2. trypsinogen into trypsin Enterokinase, secreted by the intestinal mucosa, activates trypsinogen into trypsin. Trypsin then activa... 1
- Match the trophic levels with their correct species examples in grassland ecosystem.(a) Fourth trophic level (i) Crow(b) Second trophic level (ii) Vulture(c) First trophic level (iii) Rabbit(d) Third trophic level (iv) GrassSelect the correct option… Answer: 1. (a) (ii), (b) (iii), (c) (iv), (d) (i) In a grassland food chain: grass (producer, 1st level) - rabbit (primary consumer, 2nd) -... 1
- How many true breeding pea plant varieties did Mendel select as pairs, which were similar except in one character with contrasting traits ? Answer: 3. 14 Mendel selected 14 true-breeding pea varieties, which formed seven pairs. Each pair differed in only one character with contra... 1
- Match the following columns and select the correct option.Column - I | Column - II(a) Organ of Corti | (i) Connects middle ear and pharynx(b) Cochlea | (ii) Coiled part of the labyrinth(c) Eustachian tube | (iii) Attached to the oval window(d) Stapes… Answer: 3. (a) (iv), (b) (ii), (c) (i), (d) (iii) Organ of Corti sits on the basilar membrane: (a) - (iv). Cochlea is the coiled part of the... 1
- In water hyacinth and water lily, pollination takes place by : Answer: 1. insects or wind Water hyacinth and water lily are aquatic plants but their flowers rise above water, so they are pollinated by in... 1
- Name the plant growth regulator which upon spraying on sugarcane crop, increases the length of stem, thus increasing the yield of sugarcane crop. Answer: 2. Gibberellin Gibberellin promotes stem elongation (internode length). Spraying it on sugarcane raises stem length and hence yield... 1
- In light reaction, plastoquinone facilitates the transfer of electrons from : Answer: 1. PS-II to Cytb ₆ f complex In the Z-scheme, electrons from PS II go to plastoquinone (PQ), then to the Cyt b6f complex, then plast... 1
- Which of the following is not an inhibitory substance governing seed dormancy ? Answer: 1. Gibberellic acid Seed dormancy is maintained by inhibitors such as abscisic acid, phenolic acids and para-ascorbic acid. Gibberel... 1
- Name the enzyme that facilitates opening of DNA helix during transcription. Answer: 4. RNA polymerase During transcription, RNA polymerase itself unwinds the DNA helix locally and synthesises RNA. DNA helicase opens... 1