Bihar Board 12th Biology Model Papers

Bihar Board 12th Biology Model Question Paper 1 in English Medium

Time : 3 Hours 15 Min
Total Marks : 70

Instructions for the candidates:

  1. Candidates are required to give answers in their own words as far as practicable.
  2. Figures in the right-hand margin indicate full marks.
  3. While answering the questions, the candidate should adhere to the word limit as for as practicable.
  4. 15 Minutes of extra time has been allotted for the candidates to read the questions carefully.
  5. This question paper is divided into two sections: Section – A and Section – B
  6. In Section – A, there are 35 objective type questions which are compulsory, each carrying 1 mark. Darken the circle with blue/black ball pen against the correct option on OMR Sheet provided to you. Do not use Whitener/Liquid/ Blade/Nail on OMR Sheet otherwise result will be treated as invalid.
  7. In Section – B, there are Non-objective type questions. There are 18 Short answer type questions, out of which any 10 questions are to be answered. Each question carries 2 marks. Apart from this, there are 6 long answer type questions, out of which any 3 of them are to be answered. Each question carries 5 marks
  8. Use of any electronic device is prohibited.

Objective Type Questions

Question No. 1 to 35 have four options provided out of which only one is correct. You have to mark your selected option on the OMR-Sheet. Each question carries 1 (one) mark. (1 × 35 = 35)

Question 1.
Scientific/Botanical name of Pear is
(a) Pyrus communis
(b) Pisum sativum
(c) Pyrus malus
(d) None of them
Answer:
(a) Pyrus communis

Question 2.
Reproduction by Budding occurs in which of the followings:
(a) Yeast
(b) Hydra
(c) Both A and B
(d) Amoeba
Answer:
(c) Both A and B

Bihar Board 12th Biology Model Question Paper 1 in English Medium

Question 3.
Vegetative propagation is carried out by means of Rhizome in
(a) Potato
(b) Ginger
(c) Turmeric
(d) B and C both
Answer:
(d) B and C both

Question 4.
Which among the following is an example of Bulb?
(a) Ginger
(b) Potato
(c) Onion
(d) Radish
Answer:
(c) Onion

Question 5.
Which type of Endosperm is found in Angiosperms?
(a) Haploid
(b) Diploid
(c) Triploid
(d) None of these
Answer:
(c) Triploid

Question 6.
In which of the followings Pollinia are found?
(a) Calotropis
(b) Pea
(c) Gram
(d) Grass
Answer:
(a) Calotropis

Question 7.
Which among the following is an example of Parthenocarpic fruit?
(a) Apple
(b) Pear
(c) Banana
(d) None of these
Answer:
(c) Banana

Question 8.
Mammary glands are modified
(a) Endocrine gland
(b) Lachrymal gland
(c) Sweat gland
(d) None of these
Answer:
(c) Sweat gland

Question 9.
Hoemochorial Placenta is found in which among the followings?
(a) Horse
(b) Human being
(c) Rabbit
(d) Dog
Answer:
(b) Human being

Bihar Board 12th Biology Model Question Paper 1 in English Medium

Question 10.
The test which is used for study of genetic disorders in a Foetus is called as
(a) Angiogram
(b) Laparoscopy
(c) Amniocentesis
(d) Clotting test
Answer:
(c) Amniocentesis

Question 11.
Cuscuta is
(a) Epiphytes
(b) Root Parasite
(c) Total stem parasite
(d) Both B and C
Answer:
(c) Total stem parasite

Question 12.
Which among the following is an example of Hydrophytes?
(a) Lotus
(b) Hydrilla
(c) Trapa
(d) All of these
Answer:
(d) All of these

Question 13.
Mutations can be induced by
(a) Gamma radiation
(b) Infra-red radiation
(c) Ethylene
(d) IAA
Answer:
(a) Gamma radiation

Question 14.
How many genes are responsible for ABO system of blood group in humans?
(a) one
(b) two
(c) three
(d) four
Answer:
(c) three

Question 15.
What is the distance between consecutive two nucleotides of B-DNA?
(a) 2.7 A
(b) 3.4 A
(c) 3.32 A
(d) 3.7A
Answer:
(b) 3.4 A

Bihar Board 12th Biology Model Question Paper 1 in English Medium

Question 16.
Which among the following is termination codon?
(a) AUG
(b) GUG
(c) UAA
(d) AAA.
Answer:
(c) UAA

Question 17.
The characteristic feature of DNA double helix is
(a) Complementary & anti-parallel
(b) Always circular
(c) Parallel
(d) All of these
Answer:
(a) Complementary & anti-parallel

Question 18.
Which among the following is vestigial organs in Man?
(a) Nictitating membrane
(b) Coccyx
(c) Both A and B
(d) Pelvic
Answer:
(c) Both A and B

Question 19.
The bird Archaeopteryx was found in which period?
(a) Triassic
(b) Jurassic
(c) Cretaceous
(d) None of these
Answer:
(a) Triassic

Question 20.
The study of fossils is called as
(a) Entomology
(b) Paleontology
(c) Analogy
(d) Homology
Answer:
(b) Paleontology

Question 21.
Which among the following sequence defines Ribonucleotide?
(a) Ribose sugar + Nitrogenous base
(b) Ribose sugar + Protein
(c) Ribose sugar + Phosphoric acid
(d) Ribonucleoside + Phosphate group
Answer:
(d) Ribonucleoside + Phosphate group

Question 22.
Name the organelle which helps in translation.
(a) Lysosome
(b) Ribosome
(c) Spliciosome
(d) Exone
Answer:
(b) Ribosome

Question 23.
Humoral immunity is related to which among the followings?
(a) A-cells
(b) B-cells
(c) T-cells
(d) K-cells
Answer:
(b) B-cells

Bihar Board 12th Biology Model Question Paper 1 in English Medium

Question 24.
Which among the following is Causative organism of Typhoid disease:
(a) Bacillus anthracis
(b) Plasmodium vivax
(c) Salmonella typhi
(d) None of these
Answer:
(c) Salmonella typhi

Question 25.
What is common to Earthworm, Mushroom, Dung beetle and Soil mites? They all are
(a) Herbivores
(b) Carnivores
(c) Omnivores
(d) Detritivores
Answer:
(d) Detritivores

Question 26.
Gir forest is famous for
(a) Giraffe
(b) Cheetah
(c) Deer
(d) Lion
Answer:
(b) Cheetah

Question 27.
What are the types of food chains in an Ecosystem?
(a) Grazing
(b) Detritus
(c) Both A and B
(d) None of these
Answer:
(c) Both A and B

Question 28.
Which among the following animals become extinct?
(a) White peacock
(b) Dodo
(c) Deer
(d) Tiger
Answer:
(b) Dodo

Question 29.
Which among the following is Xerophytic plant?
(a) Trapa
(b) Casuarina
(c) Opuntia
(d) Both b and c
Answer:
(c) Opuntia

Question 30.
An example of a natural gene cloning vector is-
(a) Circular plasmid
(b) Linear plasmid
(c) Ti-plasmid
(d) Virion
Answer:
(c) Ti-plasmid

Question 31.
Acid rain occurs due to
(a) CO and CO2
(b) NO2 and SO2
(c) CO2 and NO2
(d) N2 and NO2
Answer:
(b) NO2 and SO2

Question 32.
Sharbati Sonora and Kalyan Sona are improved varieties of which among the followings?
(a) Rice
(b) Wheat
(c) Maize
(d) Pulses
Answer:
(b) Wheat

Question 33.
Which bacteria transform milk into curd?
(a) Clostridium
(b) Micrococcus
(c) Lactobacillus
(d) Streptococcus
Answer:
(c) Lactobacillus

Question 34.
Somatic embryogenesis can be done by
(a) Cell culture
(b) Tissue culture
(c) Protoplast culture
(d) Both B and C
Answer:
(b) Tissue culture

Bihar Board 12th Biology Model Question Paper 1 in English Medium

Question 35.
RNAi is a method used to control
(a) Ball worms
(b) Nematodes
(c) Bacteria
(d) Fungi
Answer:
(b) Nematodes

Non-Objective Type Questions

Short Answer Type Questions

In this section, there are 18 short answer type question (each carries 2 marks) out of which answers any ten (10) questions. (10 x 2 = 20)

Question 1.
What do you mean by Global Warming? Explain.
Answer:
If there is excess increase in concentration of greenhouse gases in the atmosphere, then it would retain more and more of the infra-red radiation resulting in an enhanced greenhouse effect. Consequently, there will be increase in the global mean temperature which is referred to as Global Warming. It will cause melting of polar ice cap and glaciers. It also causes rise in sea level.

Question 2.
Describe the types of Biodiversity.
Answer:
Following are the types of Biodiversity :

  1. Genetic diversity.
  2. Species diversity
  3. Ecological diversity.

Question 3.
Write an account of four benefits of transgenic animals for human welfare.
Answer:
Following are the benefits of transgenic animals :

  1. Transgenic animals are routinely used in the laboratory as models in biomedical research.
  2. Transgenic cow produces insulin in milk.
  3. Transgenic sheep produces more wool.
  4. Transgenic animals can be specifically designed to allow the study of how genes are regulated and how they affect the normal functioning of the body.

Question 4.
What is Binary fission ? Give suitable examples. Show it with the help of diagram.
Answer:
Binary fission reproduction takes place in Amoeba. Amoeba withdraws its pseudopodia and the nucleus divides by mitosis. A constriction appears in the middle and the amoeba gets divided into two daughter amoeba.Binary fission takeks place under favourable conditions.
Bihar Board 12th Biology Model Question Paper 1 in English Medium 1

Question 5.
What are Initiation codons ? Name them.
Answer:
AUG is in itiation codon. AUG stands for methionine, polypeptide chain begins with methionine

Question 6.
What do you understand by Tissue Culture? Illustrate its any two advantages.
Answer:
Plant tissue culture is the maintenance and growth of plant cells, tissues and organs on a suitable culture medium in vitor (in a container e.g., test tube).
Advantages of tissue culture: (i) Tissue culture helps to produce more copies of same plant with desired characters.
(i) It produces some clonal variations.

Question 7.
Draw the sketches of a Zoospore and a Conidium.
Answer:
Bihar Board 12th Biology Model Question Paper 1 in English Medium 2

Question 8.
Mention advantages of self pollination.
Answer:
Advantages :

  1. It provides greater chances for pollination of flower.
  2. It is economical and pollen grains are not to be produced in enormous quantities to ensure pollination.
  3. There is no necessity of flower to be showy and of bright colour to attract pollinators.
  4. It preserves the desired and parental charracters of plants.

Question 9.
What are Communicable diseases in human beings ? Describe with suitable examples.
Answer:
Such diseases which arise directly or indirectly through infection of one to another person.
Ex: Tuberculosis, Cholera, Malaria, AIDS, etc.

Question 10.
Write about poultry farm management in brief.
Answer:
It deals with the management and rearing of flows (chickens) ducks, turkeys and pleasants for the production of eggs and meats.
Steps of proper management of poultry farm :

  1. Selection of disease free and suitable breeds.
  2. Provision of moderate climatic conditions during summer and winter.
  3. Provision of nutritions used and water.
  4. Providing comfortable, well ventilated, dry and well illuminated poultry house.
  5. Regular check up of poultry birds for diagnosis and treatment.

Question 11.
Write expanded form of the following:
(A) G.M.O.
(B) S.T.D.
(C) A.M.P.
(D) V.N.T.R.
Answer:
(A) G.M.O: Genetically Modified Organism.
(B) S.T.D: Sexually Transmitted disease.
(C) A.M.P.: Adenosine Mono Phosphate.
(D) V.N.T.R.: Variable Number Tandem Repeat.

Bihar Board 12th Biology Model Question Paper 1 in English Medium

Question 12.
Distinguish between Missing link and Connecting link.
Answer:
Missing link: It is a hypothetical extinct creature halfway in the evolutionary line between modern human beings and their anthropoid progenitors. Connecting link : Connecting link is an organism having characteristics of two different group of organisms, Ex : Peripatus is a connecting link between Annelida and Arthropoda.

Question 13.
Differentiate between :
(A) Ovipary and Vivipary
(B) Oestrius cycle and Menstrual cycle.
Answer:
(A) Ovipary: These are egg laying organisms, Ex: Fish, Frog etc.
Vivipary : Here development of embryo inside the body of parent takes place, leading to live birth of young ones. Ex. Man, Cow , etc.
(B) Oestrius Cycle and Menstrual Cycle : The females of placental mammals exhibits cyclical changes in the activities of ovaries and accessory ducts as well as hormones during the reproductive phase. However in non – primate mammals like cows, sheep, rats, deers, tiger etc, such cyclical changes occurs during reproduction are called oestrius cycle whereas in primates, e.g. monkeys, apes, & humans it is called menstrual cycle.

Question 14.
Write the scientific name of causal organism of Malaria and Elephantiasis diseasse of human being.
Answer:
(i) Malaria : Plasmodium vivax.
(ii) Elephantiasis : Wuchereria bancrafti

Question 15.
What do you understand by noise pollution. Describe its various causes.
Answer:
Noise pollution is the propagation of noise with harmful impact on the activity of human life.
Sources : Washing Machine, Cooler, Vacuum Cleaner etc.

Question 16.
Mention any two applications of GelElectrophoresis in Biotechnology.
Answer:
Applications :
(i) DNA can be separated by Gel electrophoreny.
(ii) Electrophoeny is useful in both the creation and production of vaccines.

Question 17.
Match column A with B:
Answer:
Bihar Board 12th Biology Model Question Paper 1 in English Medium 3

Question 18.
Show diagrammatic representation of clover leaf model of t-RNA molecule and name the four arms.
Answer:
Bihar Board 12th Biology Model Question Paper 1 in English Medium 4

Long Answer Type Questions

There are 6 long answers type question (each carrying 05 marks) out of which answers any three questions. (5 x 3 = 15)

Question 19.
What do you understand by Bio-fertilizer? What are the benefits soil gets from them? Name any two such bio-fertilizers.
Answer:
Bio-fertilisers are organisms that enrich the nutrient quality of the soil. The main sources of bio-fertilisers are microbes (eg. Bacteria, Fungi and Cyano-bacteria). The nodules on the roots of legunminous plants formed by the symbiotic association of Rhizobium, fix atmospheric nitrogen into organic forms, which is used by the plants as nutrient. Other bacteria can fix atmospheric nitrogen while free-living in the soil (eg. Azospirillum and Azotobacter), thus enriching the nitrogen content of the soil.

Fungi are also known to form symbiotic associations with plants (mycohiza). The fungi symbiont in these association absorbs phosphorus from soil and passes it to the plants. Plants having such associations show other benefits also, such as resistance to root-borne pathogens, tolerance to salinity and drought and an overall increase in plant growth and development.

Cyano-bacteria are autotrophic microbes which can fix atmospheric nitrogen, eg. Anabaena, Nostoc, Oscillatoria, etc. In paddy fields, Cyano-batetiar serve as an important bio-fertiliser. Blue green algae also add organic matter to the soil and increases its fertility. Currently, in our country, a number of fertilisers are available commercially in the market and farmers use these regularly in their fields to replenish soil nutrients and to reduce dependence on chemical fertilisers.

Bihar Board 12th Biology Model Question Paper 1 in English Medium

Question 20.
Show food-chain in a fresh water pond and illustrate it with the help of diagram.
Answer:
Bihar Board 12th Biology Model Question Paper 1 in English Medium 5
(saprophytic bacteria and fungi)

Question 21.
What do you understand by Mutation? What are their main types and mention its significance in brief.
Answer:
Mutation is defined as change in gene which is heritable.
The abrupt changes may take place in chromosomes, then it is called chromosomal mutation.

Types of Mutation:

  1. Somatic mutation: It occurs in somatic cells and it is non-heritable.
  2. Germinal mutation: It is found in reproductive cells and is heritable.
  3. Spontaneous mutation: Mutation occuring in nature is called spontaneous mutation.
  4. Induced mutation: When mutation is produced by mutagenic chemicals or radiations.

Significance:
Role of Mutation in Evolution: Evolution is a slow and continuous process for evolution. The basic necessity is variation. The variation among plants and animals are brought about by mutation.

Question 22.
What do you mean by Cry-protein? It is obtained from which organism? Describe its various uses.
Answer:
Cry proteins are crystalline toxins which are encoded by cry genes. It is obtained by Bacillus touring – genesis bacteria. The bacterium contains these proteins in their inactive form. When the inactive toxin protein is ingested by the insect it gets activated by the alkaline pH of the gut.

Uses of Cry-protein :

  1. It protects cotton plants from ball-worms.
  2. Many transgenic crops are produced.

Question 23.
What do you mean by Foetal Membrane? Mention its types and explain it in brief.
Answer:
The Foetal membranes are membranes associated with the developing Foetus. The two chorio-amniotic membranes are the amnion and the Chorion which make the amniotic sac surrounds and protects the foetus. The other foetal membranes are the allantois and the secondary umbilical vesicle.

Types of Foetal Membrane :

  1. Amnion: The Amnion is a transparent greyish membrane which lines the chorian. It comes to the foetal surface of the placenta and the umbilical cord.
  2. Chorion: The chorion is a double-layered membrane formed by the trophoblast and the extraembryonic mesoderm which eventually give rise to foetal part of the placenta.

Bihar Board 12th Biology Model Question Paper 1 in English Medium

Question 24.
Write short notes on any two of the following :
(a) Fisheries
(b) Ribosome
(c) Infertility
(d) Red data book.
Answer:
(a) Fisheries: Fisheries is a kind of industry which is associated with fish and other aquatic animals (crab, prawn), and for thier production, processing and marketing management. The revolution in the field of increased production of fishes is called “Blue Revolution.’

(b) Ribosome: Ribosomes are found on the endoplasmic reticulum or scattered in the cytoplasm. These vary from 150-200 A° and are made of nucleo-protein. These are found as free granules or in groups. When these are found in granules, they are called poly-ribosome.

(c) Infertility: Inability to conceive or produce children even after two years of unprotected sexual co-habitation is called infertility.

(d) Red-data book: Red-data book is a catalogue of taxa that are facing the risk of extinction. Its main aim is to give information about the urgency and scale of conservation problem to the public and policymakers.

Bihar Board 12th Biology Model Question Paper 1 in English Medium