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The purpose of biological treatment of waste water is to
General Science Biology Zoology Class 12th NEET UG NEET UG Preparation
Q. 15 of Quiz-1459 (Que-ID : 3383)
The purpose of biological treatment of waste water is to
- reduce BOD
- increase BOD
- reduce sedimentation
- increase sedimentation
Ans → (a)reduce BOD
Explanation → The purpose of biological treatment of waste water is to reduce BOD
This question is taken from this post → Microbes in Human Welfare : Class - 12th (Biology) Practice Test | MCQs for NEET - attemp/practice
More MCQs in - Microbes in Human Welfare : Class - 12th (Biology) Practice Test | MCQs for NEET
Q. 1 of Quiz-1459 (Que-ID : 3369)
Integrated Pest Management (IPM) discourages the excessive used of
- biological methods
- chemical pesticides
- mechanical methods
- all of these
Q. 2 of Quiz-1459 (Que-ID : 3370)
Which of the following is not used as a biopesticide ?
- Trichoderma harzianum
- Nucleopolyhedrovirus
- Xanthomonas campestris
- Bacillus thuringiensis
Q. 3 of Quiz-1459 (Que-ID : 3371)
Organic farming does not include
- green manures
- chemical fertilisers
- farmyard manures
- compost
Q. 4 of Quiz-1459 (Que-ID : 3372)
Organic farming includes
- use of fertilisers and pesticides of biological origin
- IPM (Integrated Pest Management)
- locally developed pest resistant varieties
- all of these
Q. 5 of Quiz-1459 (Que-ID : 3373)
Living organisms used to enrich the nutrient quality of the soil are called as
- biocontrol agents
- biofertilisers
- synthetic fertilisers
- natural fertilisers
Q. 6 of Quiz-1459 (Que-ID : 3374)
Biofertilisers are
- some bacteria and cyanobacteria
- fertilisers formed by ploughing in barseem
- fertilisers obtained by decay of dead organisms
- fertilisers prepared by mixing cattle dung with crop residues
Q. 7 of Quiz-1459 (Que-ID : 3375)
Biofertilisers are the living organisms which
- bring about soil nutrient enrichment
- maximise the ecological benefits
- minimise the environmental hazards
- all of these
Q. 8 of Quiz-1459 (Que-ID : 3376)
Which one of the following can be used as biofertiliser in cotton field ?
- Azolla-Anabaena
- Streptococcus
- Azospirillum
- Azotobacter chroococcum
Q. 9 of Quiz-1459 (Que-ID : 3377)
The symbiotic association between fungi and roots of higher plants is referred to as
- lichen
- mycorrhiza
- biofertiliser
- biocontrol agent
Q. 10 of Quiz-1459 (Que-ID : 3378)
Cyanobacteria are
- heterotrophs
- chemotrophs
- autotrophs
- organotrophs
Q. 11 of Quiz-1459 (Que-ID : 3379)
Enzyme which has the fibrinolytic effect is
- protease
- amylase
- lipase
- streptokinase
Q. 12 of Quiz-1459 (Que-ID : 3380)
Statins used for lowering blood cholesterol level are extracted from
- algae
- bacteria
- viruses
- yeast
Q. 13 of Quiz-1459 (Que-ID : 3381)
Monascus purpureus is a yeast commercially used in the production of
- citric acid
- ethanol
- blood cholesterol lowering statins
- streptokinase for removing clots from blood vessels
Q. 14 of Quiz-1459 (Que-ID : 3382)
During the primary treatment of sewage, solid particles that settle down are called
- floes
- primary sludge
- activated sludge
- anaerobic sludge
Q. 15 of Quiz-1459 (Que-ID : 3383)
The purpose of biological treatment of waste water is to
- reduce BOD
- increase BOD
- reduce sedimentation
- increase sedimentation
Q. 16 of Quiz-1459 (Que-ID : 3384)
The masses of bacteria held together by slime and fungal filaments to form mesh-like structures are called as
- primary sludge
- floes
- activated sludge
- anaerobic sludge
Q. 17 of Quiz-1459 (Que-ID : 3385)
BOD is………..in polluted water and in potable water.
- more, less
- less, more
- less in both
- medium in both
Q. 18 of Quiz-1459 (Que-ID : 3386)
n the sewage treatment, bacterial floes are allowed to sediment in a settling tank. This sediment is called as
- inactivated sludge
- activated sludge
- primary sludge
- secondary sluge
Q. 19 of Quiz-1459 (Que-ID : 3387)
Which of the following steps is taken by the Ministry of Environment and Forests to protect rivers from water pollition ?
- Ganga Action Plan
- Narmada Action Plan
- Yamuna Action Plan
- Both (a) and (c)
Q. 20 of Quiz-1459 (Que-ID : 3388)
Methanogens, growing anaerobically on cellulosic material produce
- methane
- methane and carbon dioxide
- methane and hydrogen
- methane, carbon dioxide and hydrogen
Q. 21 of Quiz-1459 (Que-ID : 3389)
Which of the following bacteria is present in the rumen of cattle ?
- Azotobacter
- Rhizobium
- Methanobacterium
- Azospirillum
Q. 22 of Quiz-1459 (Que-ID : 3390)
Process of biogas production is
- aerobic process
- anaerobic process
- active process
- passive process
Q. 23 of Quiz-1459 (Que-ID : 3391)
Biogas is produced by
- aerobic breakdown of biomass
- anaerobic breakdown of biomass
- with the help of methanogenic bacteria
- both (b) and (c)
Q. 24 of Quiz-1459 (Que-ID : 3392)
Dragonflies are used to get rid of
- mosquitoes
- aphids
- butterfly caterpillars
- both (a) and (b)
Q. 25 of Quiz-1459 (Que-ID : 3393)
A microbial biocontrol agent that can be used to control butterfly caterpillars is
- Trichoderma polysporum
- Bacillus thuringiensis
- Streptococcus
- mycorrhiza
More MCQs In - General Science Biology Zoology Class 12th NEET UG NEET UG Preparation
Q. 19 of Quiz- (Que-ID : 2737)
Diatoms do not have
- Indestructible cell wall
- Cell wall are like soap box
- Two thick overlapping cells
- Release cell wall deposits
Q. 16 of Quiz- (Que-ID : 3109)
Toxicity of which element leads to the appearance of brown spots on leaves
- Mg
- Mn
- Fe
- Cu
Q. 13 of Quiz- (Que-ID : 3531)
Minimata disease is caused by
- ByChromium
- By Cadmium
- By Methyl mercury
- By Radioactive elements
Q. 2 of Quiz- (Que-ID : 3145)
An example of competitive inhibition of an enzyme is the inhibition of
- succinic dehydrogenase by malonic acid
- cytochrome oxidase by cyanide
- hexokinase by glucose-6-phosphate
- carbonic anhydrase by carbon dioxide
Q. 2 of Quiz- (Que-ID : 3345)
Which of the following is correctly matched ?
- Sericulture – Fish
- Aquaculture – Mosquito
- Apiculture – Honeybee
- Pisciculture – Silkmoth
Q. 25 of Quiz- (Que-ID : 2943)
Genes located very close to one another on same chromosome tend to be transmitted together and are called as
- allelomorphs
- identical genes
- linked genes
- recessive genes
Q. 12 of Quiz- (Que-ID : 3430)
Which one of the following is a step of PCR?
- Denaturation
- Annealing
- Extension
- All of these
Q. 5 of Quiz- (Que-ID : 2873)
Which of the following STDs are not completely curable ?
- Chlamydiasis, gonorrhoea, trichomoniasis
- Chancroid syphilis, genital warts
- AIDS, syphilis, hepatitis B
- AIDS, genital herpes, hepatitis B
Q. 4 of Quiz- (Que-ID : 2847)
Nonessential floral organs in a flower are
- sepals and petals
- anther and ovary
- stigma and filament
- petals only.
Q. 10 of Quiz- (Que-ID : 2853)
An embryo may sometimes develop from any cell of embryo sac other than egg. It is termed as
- apospory
- apogamy
- parthenogenesis
- parthenocarpy
Q. 23 of Quiz- (Que-ID : 3016)
A cell plate is laid down during
- Cytokinesis
- Interphase
- Karyokinesis
- None of these
Q. 14 of Quiz- (Que-ID : 2957)
In E. colt, the lac operon gets switched on when
- lactose is present and it binds to the repressor
- repressor binds to operator
- RNA polymerase binds to the operator
- lactose is present and it binds to RNA polymerase.
Q. 16 of Quiz- (Que-ID : 3334)
Which form of pathogen is used in vaccination ?
- Activated and strong pathogenic antigens
- Inactivated and weakened pathogenic antigens
- Hyperactive and strong pathogen
- Preformed antibodies
Q. 17 of Quiz- (Que-ID : 3235)
The term phyllotaxy is used to describe the
- type of ovary in a plant
- mode of arrangement of leaves
- type of roots
- arrangement of sepals and petals
Q. 15 of Quiz- (Que-ID : 2958)
In DNA strand, the nucleotides are linked together by
- glycosidic bonds
- phosphodiester bonds
- peptide bonds
- hydrogen bonds
Q. 21 of Quiz- (Que-ID : 3289)
In chlorophyta the mode of sexual reproduction is
- Isogamy
- Anisogamy
- Oogamy
- Isogamy, Anisogamy and oogamy
Q. 3 of Quiz- (Que-ID : 2996)
Choose the correct sequence. A. Chromatin condensation B. Protein synthesis C. Duplication of centrioles D. Centrioles moves towards opposite poles
- C, A, B, D
- C, B, A, D
- C, D, B, A
- A, C, D, B
Q. 6 of Quiz- (Que-ID : 3099)
Manganese toxicity leads to deficiency of
- iron
- calcium
- magnesium
- all of the above
Q. 18 of Quiz- (Que-ID : 3086)
Which of the following process (C4 cycle) occurs in bundle sheath cells?
- Regeneration
- Fixation
- Carboxylation
- Decarboxylation
Q. 16 of Quiz- (Que-ID : 3034)
Which plant growth regulator is the derivative of carotenoids?
- Auxin
- Gibberelic acid
- Cytokinin
- Abscisic acid
Q. 12 of Quiz- (Que-ID : 2655)
which among the following is measured by spirometer
- Total lung capacity
- FRC
- RV
- TV
Q. 14 of Quiz- (Que-ID : 2907)
Bartholin’s glands are situated
- on the either side of vagina in humans
- on either side of vas deferens in humans
- on either side of penis in humans
- on either side of Fallopian tube in humans
Q. 5 of Quiz- (Que-ID : 3373)
Living organisms used to enrich the nutrient quality of the soil are called as
- biocontrol agents
- biofertilisers
- synthetic fertilisers
- natural fertilisers
Q. 12 of Quiz- (Que-ID : 2625)
Glucose and amino acids are transported by which transport
- Facilitated diffusion
- Diffusion
- Active transport
- Passive transport
Q. 23 of Quiz- (Que-ID : 3216)
Which among the following are elongated or tube like cells with thick and lignified walls and tapering ends?
- Xylem fibres
- Xylem parenchyma
- vessels
- Tracheids
Q. 12 of Quiz- (Que-ID : 2955)
The amino acid attaches to the tRNA at its
- 5’- end
- 3’ – end
- anticodon site
- DHUloop.
Q. 22 of Quiz- (Que-ID : 2965)
Find out the wrong statement about heterochromatin,
- It is densely packed
- It stains dark
- It is transcriptionally active.
- It is late replicating
Q. 25 of Quiz- (Que-ID : 3268)
Which one of the following groups of animals is bilaterally symmetrical and triploblastic
- Aschelminthes (round worms)
- Ctenophores
- Sponges
- Coelenterates (Cnidarians)
Q. 24 of Quiz- (Que-ID : 3067)
Number of oxygen atoms required for aerobic oxidation of one pyruvate
- 10
- 8
- 5
- 12
Q. 23 of Quiz- (Que-ID : 3116)
The enzyme involved in biological nitrogen fixation are
- Carboxylase
- Oxygenase
- Dehydrogenase
- Nitrogenase
Q. 10 of Quiz- (Que-ID : 3328)
A toxic substance, responsible for the chills and high fever recurring every three to four days in malarial fever, is
- interferon
- haemozoin
- hirudin
- colostrum
Q. 13 of Quiz- (Que-ID : 3531)
Minimata disease is caused by
- ByChromium
- By Cadmium
- By Methyl mercury
- By Radioactive elements
Q. 23 of Quiz- (Que-ID : 2916)
The process of release of spermatozoa from Sertoli cells into cavity of the seminiferous tubules is called
- spermiogenesis
- spermatogenesis
- spermatocytogenesis
- spermiation
Q. 18 of Quiz- (Que-ID : 3261)
Fluke infections are diseases of the _______ in humans
- Blood
- Bile
- Digestive tract
- Lung
Q. 19 of Quiz- (Que-ID : 3387)
Which of the following steps is taken by the Ministry of Environment and Forests to protect rivers from water pollition ?
- Ganga Action Plan
- Narmada Action Plan
- Yamuna Action Plan
- Both (a) and (c)
Q. 23 of Quiz- (Que-ID : 2636)
Dentine is originated from which cell
- Amiloblast cell
- Odontioblast cell
- Chief cell
- Peptic cell
Q. 7 of Quiz- (Que-ID : 2750)
which of the following acts on bones
- Melatonin
- Triiodothyronine
- GH
- Parathyroid
Q. 2 of Quiz- (Que-ID : 2970)
Which among the following is not ureotelic
- Mammal
- Aquatic insect
- Terrestrial amphibian
- Marine fishes
Q. 22 of Quiz- (Que-ID : 3315)
The ‘Devonian period’ is considered to be as
- age of fishes
- age of amphibians
- age of reptiles
- age of mammals
Q. 24 of Quiz- (Que-ID : 3367)
Which of the following dieases is caused by bacteria ?
- Tobacco mosaic
- Black rot of crucifers
- Red rot of sugarcane
- Late blight of potato
Q. 20 of Quiz- (Que-ID : 3488)
Which of the following ecosystem has highest gross primary productivity
- Grassland
- Coral reefs
- Mangrooves
- Rainforests
Q. 18 of Quiz- (Que-ID : 3111)
Which element is required for opening and closing of stomata?
- P
- K
- Ca
- Na
Q. 8 of Quiz- (Que-ID : 2851)
The outermost and innermost wall layers of microsporangium in an anther are respectively
- endothecium and tapetum
- epidermis and endodermis
- epidermis and middle layer
- epidermis and tapetum.
Q. 19 of Quiz- (Que-ID : 2937)
Inheritance of roan coat in cattle is an example of
- incomplete dominance
- codominance
- multiple allelism
- none of these
Q. 25 of Quiz- (Que-ID : 3318)
The extinct stone ancestor, who ate only fruits and hunted with stone weapons was
- Ramapithecus
- Australophecus
- Dryopithecus
- Homo erectus
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