Test 8 (Class 12)- Type Bio SCAN (Old NCERT)Contact Number: 8527521718Test 8 (Class 12)- Type Bio SCAN (Old NCERT)Contact Number: 8527521718Quorn, a meat substitute product, contains mycoprotein as an ingredient, which is derived from:
1. Methylophilus methylotrophs
2. Fusarium venenatum
3. Aspergillus oryzae
4. Trichoderma fuliginoides
Asthma may be attributed to :
1. accumulation of fluid in the lungs
2. bacterial infection of the lungs
3. allergic reaction of the mast cells in the lungs
4. inflammation of the trachea
What is true for the production of penicillin in a bioreactor?
| I: | Penicillin is a secondary metabolite of certain species of Penicillium and is produced during active growth. |
| II: | Glucose inhibits penicillin production, whereas lactose does not. |
1. Only I
2. Only II
3. Both I and II
4. Neither I nor II
Select the correct group of biocontrol agents:
| 1. | Nostoc, Azospirillium, Nucleopolyhedrovirus |
| 2. | Bacillus thuringiensis. Tobacco mosaic virus, Aphids |
| 3. | Trichoderma, Baculovirus, Bacillus thuringiensis |
| 4. | Oscilatoria, Rhizobium, Trichoderma |
Statins produced by the yeast Monascuspurpureus have been commercialized as:
| 1. | hormone replacement therapy for menopausal women. |
| 2. | increasing receptor sensitivity in type II diabetes mellitus. |
| 3. | a clotting factor for the treatment of Hemophilia A. |
| 4. | blood-cholesterol lowering agent. |
The two antibiotic resistance genes on vector pBR 322 are for:
| 1. | Ampicillin and Tetracycline |
| 2. | Ampicillin and Chloramphenicol |
| 3. | Chloramphenicol and Tetracycline |
| 4. | Tetracycline and Kanamycin |
A person showing upredictable moods, outbursts of emotion, quarrelsome behaviour and conflicts with others is suffering from:
1. schizophrenia
2. borderline personality disorder (BPD)
3. mood disorders
4. addictive disorders
Which of the following is a commercial blood cholesterol lowering agent?
1. Lipase
2. Cyclosporin A
3. Statin
4. Streptokinase
Which of the following enhances or induces the fusion of protoplasts?
Which of the following endoparasites of humans show viviparity?
To induce multiple ovulation in MOET program for herd improvement, the cow is administered with hormone with activity similar to:
1. FSH
2. LH
3. Estrogen
4. Progesterone
Match List - I with List - II
| List - I | List - II |
| (a) Protoplast fusion | (i) Totipotency |
| (b) Plant tissue culture | (ii) Pomato |
| (c) Meristem culture | (iii) Somaclones |
| (d) Micropropagation | (iv) Virus free plants |
Choose the correct answer from the options given below.
(a) (b) (c) (d)
1. (iii) (iv) (i) (ii)
2. (iv) (iii) (ii) (i)
3. (iii) (iv) (ii) (i)
4. (ii) (i) (iv) (iii)
Breeding of crops with high levels of minerals, vitamins, and proteins is called:
| 1. | somatic hybridization |
| 2. | biofortification |
| 3. | biomagnification |
| 4. | micropropagation |
Use of anti-histamines and steroids gives quick relief from:
1. Allergy
2. Nausea
3. Cough
4. Headache
Consider the following four measures (A.D) that could be taken to successfully grow chickpeas in an area where bacterial blight disease is common:
| (A) | spray with Bordeaux mixture |
| (B) | control of the insect vector of the disease pathogen |
| (C) | use of only disease-free seeds |
| (D) | use of varieties resistant to the disease |
Which two of the above measures can control the disease?
1. B and C
2. A and B
3. C and D
4. A and D
Which one of the following statement is correct?
1. Patients who have undergone surgery are given cannabinoids to relieve pain
2. Benign tumours show the property of metastasis
3. Heroin accelerates body functions
4. Malignant tumours may exhibit metastasis
Which of the following is a pair of viral diseases?
1. Ringworm, AIDS
2. Common cold, AIDS
3. Dysentery, common cold
4. Typhoid, tuberculosis
Match the following techniques or instruments with their usage:
| Column I | Column II | ||
| (a) | Bioreactor | (i) | Separation of DNA fragments |
| (b) | Electrophoresis | (ii) | Production of large quantities of products |
| (c) | PCR | (iii) | Detection of pathogens, based on antigen-antibody reaction |
| (d) | ELISA | (iv) | Amplification of nucleic acids |
Select the correct option from the following:
| 1. | (a)-(iii), (b)-(ii), (c)-(iv), (d)-(i) |
| 2. | (a)-(ii), (b)-(i), (c)-(iv), (d)-(iii) |
| 3. | (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i) |
| 4. | (a)-(ii), (b)-(i), (c)-(iii), (d)-(iv) |
Now a days it is possible to detect the mutated gene causing cancer by allowing the radioactive probe to hybridise its complementary DNA in clone of cells, followed by its detection using autoradiography because:
| 1. | mutated gene does not appear on a photographic film as the probe has no complementarity with it. |
| 2. | mutated gene does not appear on photographic film as the probe has complementarity with it. |
| 3. | mutated gene partially appears on a photographic film. |
| 4. | mutated gene completely and clearly appears on a photographic film. |
Given below are four statements pertaining to separation of DNA fragments using Gel electrophoresis. Identify the incorrect statements.
(a) DNA is negatively charged molecule and so it is loaded on gel towards the Anode terminal.
(b) DNA fragments travel along the surface of the gel whose concentration does not affect movement of DNA.
(c) Smaller the size of DNA fragment, larger is the distance it travels through it.
(d) Pure DNA can be visualized directly by exposing to UV radiation.
1. (a), (c) and (d)
2. (a), (b) and (c)
3. (b), (c) and (d)
4. (a), (b) and (d)
Recombinant therapeutic [used for treatment] products are available for all the following disorders except:
1. Hemophilia A
2. Pituitary dwarfism
3. Diabetes insipidus
4. Anemia due to renal failure
For transformation, microparticles coated with DNA to be bombarded with gene gun are made up of:
1. Silver or platinum
2. Platinum or zinc
3. Silicon or platinum
4. Gold or tungsten
Which part of the tobacco plant is infected by Meloidogyne incognita?
| 1. | Flower | 2. | Leaf |
| 3. | Stem | 4. | Root |
An enzyme catalysing the removal of nucleotides from ends of DNA is:
| 1. | DNA ligase | 2. | Endonuclease |
| 3. | Exonuclease | 4. | Protease |
Plasmid has been used as a vector because:
| 1. | It is circular DNA that has the capacity to join to eukaryotic DNA |
| 2. | It can move between prokaryotic and eukaryotic cells |
| 3. | Both ends show replication |
| 4. | It has an antibiotic resistance gene |
Western Ghats have a large number of plant and animal species that are not found anywhere else. Which of the following terms will you use to notify such species?
| 1. | Endemic | 2. | Vulnerable |
| 3. | Threatened | 4. | Keystone |
The largest net primary production of the Earth is contributed by:
1. savanna
2. salt marsh
3. open ocean
4. tropical rainforest
The impact of immigration on population density is:
| 1. | Negative |
| 2. | Both positive and negative |
| 3. | Neutralized by natality |
| 4. | Positive |
An ecosystem that can be easily damaged but can recover after some time if the damaging effect stops will have:
1. High stability and low resilience
2. Low stability and low resilience
3. High stability and high resilience
4. Low stability and high resilience
Niche overlap indicates:
| 1. | active cooperation between two species |
| 2. | two different parasites on the same host |
| 3. | sharing of one or more resources between the two species |
| 4. | mutualism between two species |
The following graph depicts changes in two populations (A and B) of herbivores in a grassy field. A possible reason for these changes is that:
| 1. | both plant populations in this habitat decreased |
| 2. | population-B competed more successfully for food than population-A |
| 3. | population-A produced more offspring than population-B |
| 4. | population-A consumed the members of population-B |
Over-exploitation is an important threat to the extinction of especially:
1. animals with a broad ecological niche
2. aquatic marine animals
3. large animals with low reproductive rates
4. terrestrial organisms
Most organic carbon on Earth is found in:
1. Atmosphere
2. Oceans
3. Biomass
4. Sedimentary rocks
Between which among the following, the relationship is not an example of commensalism?
| 1. | Orchid and the tree on which it grows |
| 2. | Cattle Egret and grazing cattle |
| 3. | Sea Anemone and Clown fish |
| 4. | Female wasp and fig species |
The vertical distribution of different species occupying different levels in a biotic community is known as:
The decline in the population of Indian native fishes due to the introduction of Clarias gariepinus in the river Yamuna can be categorised as:
| 1. | Co-extinction |
| 2. | Habitat fragmentation |
| 3. | Over-exploitation |
| 4. | Alien species invasion |
The Earth Summit held in Rio de Janeiro in 1992 was called:
1. for immediate steps to discontinue use of CFCs that were damaging the ozone layer
2. to reduce emissions and global warming
3. for conservation of biodiversity and sustainable utilization of its benefits
4. to asess threat posed to native species by invasive weed species
The association of cattle egret and grazing cattle is best described as:
| 1. | Commensalism |
| 2. | Mutualism |
| 3. | Ectoparasitism |
| 4. | Amensalism |
The plant having the largest flower is:
1. Total stem parasite
2. Epiphyte
3. Total root parasite
4. Partial stem parasite
| A. | During open heart, surgery blood is circulated in the heart-lung machine. |
| B. | Blockage in coronary arteries X-ray by angiography. |
| C. | Computerized Axial Tomography (CAT) shows a detailed internal structure as seen in a section of the body. |
| D | X-ray provides clear and detailed images of organs like prostate glands and lungs. |
1. B and D
2. C and D
3. A and C
4. A and B
The rate of decomposition is faster in the ecosystem due to the following factors EXCEPT:-
| 1. | Detritus rich in sugars |
| 2. | Warm and moist environment |
| 3. | Presence of aerobic soil microbes |
| 4. | Detritus richer in lignin and chitin |
In the equation GPP - R = NPP,
R represents:
| 1. | Environment factor |
| 2. | Respiration losses |
| 3. | Radiant energy |
| 4. | Retardation factor |
Which one of the following is not a bioindicator of water pollution?
1. Sludge-worms
2. Blood-worms
3. Stone files
4. Sewage fungus
COP 26 was originally scheduled to take place from 9 to 19 November 2020, in:
1. Madrid, Spain
2. Rio, Brazil
3. Glasgow, UK
4. Paris, France
Rachel Carson's famous book 'Silent Spring' is related to:
The UN Conference of Parties on climate change in the year 2012 was held at?
1. Durban
2. Doha
3. Lima
4. Warsaw
Which of the following is not one of the prime health risks associated with greater UV radiation through the atmosphere due to the depletion of the stratospheric zone?
Eutrophication of water bodies leading to the killing of fishes is mainly due to non-availability of:
1. Food
2. Light
3. Essential minerals
4. Oxygen
Which of the following regions of the globe exhibits the highest species diversity?
1. Madagascar
2. Himalayas
3. Amazon forests
4. Western Ghats of India
Which of the following pair of gases is mainly responsible for the greenhouse effect?
1. Carbon dioxide and methane
2. Ozone and Ammonia
3. Oxygen and Nitrogen
4. Nitrogen and Sulphur dioxide