Biology Specimen Paper Sec-C 2023 Solved for ISC Class-12. Step by step solutions as council prescribe guideline of model sample question paper. During solutions of Biology specimen paper we explain with figure , graph, table whenever necessary so that student can achieve their goal in next upcoming exam of council. Visit official website CISCE for detail information about ISC Board Class-12.
ISC Class-12 Biology Specimen Paper 2023 Solved sec-C
| Board | ISC |
| Class | 12th (xii) |
| Subject | Biology (Section-C) |
| Topic | ISC Specimen Paper Solved |
| Syllabus | on Revised syllabus |
| Session | 2022-23 |
Biology Specimen Paper Sec-C 2023 Solved for ISC Class-12
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ISC SPECIMEN QUESTION PAPER 2023
Biology Paper 1 (Theory)
Maximum Marks: 70
Time Allowed: Three hours
(Candidates are allowed additional 15 minutes for only reading the paper. They must NOT start writing during this time).
- This paper is divided into four sections – A, B, C and D.
- Answer all questions.
- Section A consists of one question having sub-parts of one mark each.
- Section B consists of seven questions of two marks each.
- Section C consists of nine questions of three marks each, and
- Section D consists of three questions of five marks each.
- Internal choices have been provided in two questions each in Section B, Section C and Section D.
- The intended marks for questions are given in brackets [ ].
SECTION C – 14 MARKS
ISC Class-12 Biology Specimen Paper 2023 Solved sec-B
Question 9: Draw a neatly labelled diagram of a microspore.
Answer:
Question 10:
(i) Figure see in question paper .
(a) Identify the diagram given above.
(b) What is the role of the part labelled ‘A’?
(c) Redraw the diagram and label any three parts.
OR
(ii) A bacterial culture was grown on a specific culture medium containing a chromogenic substrate. After sometime, it was observed that some colonies developed a blue-coloured appearance while some remained colourless. Briefly explain the phenomenon responsible for this observation.
Answer:
(i)
(ii)
Question 11: What is meant by ‘biocontrol’? Explain how Trichoderma and Baculovirus act as biocontrol agents.
Answer: It is used to increase crop yield and production. The principle used in biological control is predation and parasitism. It kills the insect without causing any effects to human health—some of the microbes used as biocontrol agents are the Bacillus thuringiensis, Trichoderma, Baculoviruses, and Nucleopolyhedrovirus.
Question 12: What are linked genes? Give a schematic representation of a test cross between a whiteeyed female Drosophila and a red-eyed male Drosophila.
Answer: The two or more genes are said to be linked when they are located on the same chromosome and cannot segregate independently as they are inherited together. The linked genes are arranged linearly.
The cross of white eyed female with red eyed male gives red eyed females and white eyed males. Rarely this cross may give all white eyed females and red eyed males. This results from non-seperation of two homologous X chromosomes during anaphase I of meiosis.
Question 13: Alcoholic drinks are produced by fermentation, but some beverages are produced through an additional process of distillation. How do the distilled and undistilled alcoholic beverages differ in their quality and composition? Explain by giving one example each for a distilled alcoholic beverage and an undistilled alcoholic beverage.
Answer: The distillation process concentrates the alcohol content of fermented drinks by removing water and other components, making them stronger. All forms of liquor and spirits are distilled alcohol and typically have higher alcohol by volume (ABV) and alcohol proof than undistilled alcohols.
Question 14: Consider the situation, where a variety of birds depend upon a big tree for their survival. The birds in turn are hosts for the different parasites surviving on them. Draw a pyramid of number to represent the above situation.
Answer:
In the above pyramid the population of insects is more than the tree; therefore, the size of pyramid increases, but the number of small birds is lesser than the insects. The pyramid size becomes narrow. Further, big birds are lesser than small birds. So the size of pyramid becomes narrower.
Question 15: Explain any three ex situ methods of conservation of biodiversity.
Answer: It is the methods of conserving all the living species in the artful habitats that reflect their natural living habitats. Examples of ex-situ conservation of biodiversity include aquariums, botanical gardens, cryopreservation, DNA banks, zoos, etc.
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