Bihar Board 12th Biology Objective Important Questions Part 4

Bihar Board 12th Biology Objective Important Questions Part 4

Question 1.
Ecosystem represented by a pond is said to be:
(a) Lentic
(b) Lotic
(c) Xeric
(d) Benthic
Answer:
(a) Lentic

Question 2.
The tiny free swimming animals on the surface of water constitute:
(a) Phytoplankton
(b) Symbionts
(c) Benthos
(d) Zooplankton
Answer:
(d) Zooplankton

Question 3.
The 10% law for energy transfer in food chains was given by:
(a) Stanley
(b) Tansley
(c) Lindemann
(d) Weismann
Answer:
(c) Lindemann

Question 4.
Ozone depletion is caused by:
(a) CO
(b) PAN
(c) CFCs
(d) None of these
Answer:
(c) CFCs

Question 5.
Most harmful environmental pollutants are:
(a) Human organic wastes
(b) Natural nutrients in excess
(c) Nanbiodegradable chemicals
(d) Nitrogenous wastes
Answer:
(c) Nanbiodegradable chemicals

Question 6.
Smog is a combination of:
(a) Smoke & fog
(b) Water & smoke
(c) Air & Water
(d) Fire & Water
Answer:
(a) Smoke & fog

Question 7.
Greenhouse effect is due to:
(a) CO₂
(b) CO
(c) NO
(d) PO₄
Answer:
(a) CO₂

Question 8.
Secondary sewage treatment is mainly a:
(a) Physical process
(b) Mechanical process
(c) Chemical process
(d) Biological process
Answer:
(d) Biological process

Question 9.
Lichens are described as indicator of:
(a) Air pollution
(b) Water pollution
(c) Soil pollution
(d) Agriculture productivity
Answer:
(a) Air pollution

Question 10.
In followings which one is not a greenhouse gas:
(a) CO₂
(b) N₂O
(C) CH₄
(d) Ethane
Answer:
(d) Ethane

Question 11.
In agriculture biotechnology the main technique used:
(a) Transformation
(b) Tissue culture
(c) Plant reproduction
(d) DNA replication
Answer:
(b) Tissue culture

Question 12.
The medicine prepared by biotechnology is used in cancer therapy:
(a) Interferon
(b) HGH
(c) TSH
(d) Insulin
Answer:
(a) Interferon

Question 13.
First transgenic plant was:
(a) Pea
(b) Tisi
(c) Tobacco
(d) Cotton plant
Answer:
(c) Tobacco

Question 14.
Bacillus Thuriengensis strains are used practically for:
(a) Bio metallurgical technique
(b) Bio mineral process
(c) Bio insecticidal plant
(d) Biofertilizer
Answer:
(c) Bio insecticidal plant

Question 15.
In cheese industry rennin is used that is:
(a) Alkaloid
(b) Enzyme
(c) Fungi
(d) Hormone
Answer:
(b) Enzyme

Question 16.
In Golden rice which one vitamin is found:
(a) Vitamin A
(b) Vitamin B₁₂
(c) Vitamin C
(d) Vitamin D
Answer:
(a) Vitamin A

Question 17.
Which one is the best fertilizer?
(a) Synthetic fertilizer
(b) Bacillus thuringiensis & Lichen
(c) Azolla & Cyanobacteria
(d) All of the above
Answer:
(c) Azolla & Cyanobacteria

Question 18.
Biogas is:
(a) CO₂
(b) H₂S
(c) CH₄
(d) All of these
Answer:
(c) CH₄

Question 19.
Which of the following is single celled protein?
(a) Spirulina
(b) Chlorella
(c) Syndesmus
(d) All of these
Answer:
(d) All of these

Question 20.
Cyanobacteria is used as biofertilizer in:
(a) Wheat
(b) Paddy
(c) Maize
(d) Sugarcane
Answer:
(b) Paddy

Question 21.
The group of bacteria those are used in production of biogas Is called:
(a) Methanotroph
(b) Organotroph
(c) Eubacteria
(d) Methanogen
Answer:
(d) Methanogen

Question 22.
Azolla forms symbiotic combination with:
(a) Chlorella
(b) Nostoc
(c) Anabaena
(d) E. Coli
Answer:
(c) Anabaena

Question 23.
If BOD of sample water is very high, The sample is:
(a) Highly polluted
(b) Less Polluted
(c) Not polluted
(d) Potable
Answer:
(a) Highly polluted

Question 24.
The first antibiotic was discovered by:
(a) Robert Koch
(b) Louis Pasteur
(c) W. Flemming
(d) A. Flemming
Answer:
(d) A. Flemming

Question 25.
Who discovered recombinant DNA (r-DNA) technology?
(a) Har Gobind Khorana
(b) James D. Watson
(c) Stanley cohen & Herbert Boyer
(d) Walter Sutton & Avery
Answer:
(c) Stanley cohen & Herbert Boyer

Question 26.
Cry I endotoxin obtained from Bacillus thuringiens is are effective against:
(a) Nematodes
(b) Boll Worms
(c) Mosquitoes
(d) Flies
Answer:
(b) Boll Worms

Question 27.
In following which is the first national park is India?
(a) Bandipur
(b) Corbett
(c) Kanha
(d) Dwdwa
Answer:
(b) Corbett

Question 28.
Which organisation is responsible for preparation of ‘Red Data Book’ information?
(a) IUCN
(b) CITES
(c) WWF
(d) IBWL
Answer:
(a) IUCN

Question 29.
Wildlife protection act was presented in:
(a) 1972
(b) 1981
(c) 1986
(d) 1991
Answer:
(a) 1972

Question 30.
Kaziranga Natioinal Park is in:
(a) Bengal
(b) Assam
(c) Kerala
(d) Karnataka
Answer:
(b) Assam

Question 31.
Kanha National Park is famous for protection of:
(a) Birds
(b) Rhinoceros
(c) Tigers
(d) Crocodiles
Answer:
(c) Tigers

Question 32.
Biodiversity hot spots in world is:
(a) 9
(b) 25
(c) 34
(d) 38
Answer:
(c) 34

Question 33.
Fluoride pollution affects mainly which organ?
(a) Teeth
(b) Kidney
(c) Brain
(d) Heart
Answer:
(a) Teeth

Question 34.
In following which one is greenhouse gas?
(a) CFC, CH₄, NO₂ & CO₂
(b) CFC, CO₂, NH₂ & N₂
(c) CO₂, CO, NH₃ & NH₂
(d) CFC, N₂, CO₂ & NH₂
Answer:
(a) CFC, CH₄, NO₂ & CO₂

Question 35.
Ozone layer is found in which stratification?
(a) Stratosphere
(b) Lithosphere
(c) Troposphere
(d) Hemisphere
Answer:
(a) Stratosphere

Question 36.
Chipko movement has established for protection of:
(a) Grassland
(b) Forests
(c) Mountain
(d) River
Answer:
(b) Forests

Question 37.
In acid rain, SO₂ is found in percentage of:
(a) 100%
(b) 30%
(c) 70%
(d) 50%
Answer:
(c) 70%

Question 38.
In ‘Red Data Book’ which type of species are listed?
(a) Rare species
(b) Rare and endangered species
(c) Endangered species
(d) None of these
Answer:
(b) Rare and endangered species

Question 39.
Invertebrates the endangered species are more of what group of animals
(a) Fishes
(b) Reptiles
(c) Birds
(d) Mammals
Answer:
(d) Mammals

Question 40.
In followings which one is a disease of hen?
(a) Cholera
(b) Smut
(c) Ranikhet
(d) Cold & Cough
Answer:
(c) Ranikhet

Question 41.
From one cell of plant whole plant can be formed. This property is called
(a) Cloning
(b) Somacloning
(c) Totipotency
(d) None of these
Answer:
(b) Somacloning

Question 42.
In man ring warm disease develops by:
(a) Bacteria
(b) Viruses
(c) Fungi
(d) Nematode
Answer:
(c) Fungi

Question 43.
Which term of Plasmodium infects man?
(a) Merozoites
(b) Trophozoites
(c) Sporozoites
(d) Gametocytes
Answer:
(c) Sporozoites

Question 44.
Male has originated by cross between:
(a) Female horse and male donkey
(b) Male horse and female donkey
(c) Bull and female horse
(d) None of these
Answer:
(a) Female horse and male donkey

Question 45.
Bikaneri ewes and Marino rams crossing, a new breed of sheep developed called:
(a) Bhakarwal
(b) Nellore
(c) Lincoin
(d) Hisardale
Answer:
(d) Hisardale

Question 46.
Improved varieties of wheat suitable for Indian climates have been developed by:
(a) Hybridisation and mutation
(b) Mutation & cloning
(c) Cloning of polyploids
(d) Polyploidy & hybridization
Answer:
(a) Hybridisation and mutation

Question 47.
Somacloruil variation can be obtained by:
(a) Hybridization
(b) Application of colchicine
(c) Irradiation with gamma rays
(d) Tissue culture
Answer:
(d) Tissue culture

Question 48.
Spirulina is a rich source of:
(a) Protein
(b) vitamins
(c) Minerals
(d) Lipids
Answer:
(a) Protein

Question 49.
Which one of the followings is a marine fish?
(a) Carp
(b) Catla
(c) Hilsa
(d) Nohu
Answer:
(c) Hilsa

Question 50.
Which one of the following products is used in cosmetics and polishes?
(a) Oil
(b) Wax
(c) Royal jelly
(d) Honey
Answer:
(b) Wax

Bihar Board 12th Biology Important Questions