The vitamin whose content increases following the conversion of milk into curd by lactic acid bacteria is:
1. | vitamin C | 2. | vitamin D |
3. | vitamin B12 | 4. | vitamin E |
Match the items in Column ‘A’ and Column ‘B’ and choose the correct answer:
Column I | Column II | ||
A. | Lady bird | i. | Methanobacterium |
B. | Mycorrhiza | ii. | Trichoderma |
C. | Biological control | iii. | Aphids |
D. | Biogas | iv. | Glomus |
The correct answer is:
1. A-ii, B-iv, C-iii, D-i
2. A-iii, B-iv, C-ii, D-i
3. A-iv, B-i, C-ii, D-iii
4. A-iii, B-ii, C-i, D-iv
Which one of the following options gives the correct matching of a disease with its causative organism and mode of infection.
Disease |
Causative Organisms |
Mode of Infection |
|
1. |
Typhoid |
Salmonella typhi |
With inspired air |
2. |
Pneumonia |
Streptococcus pneumoniae |
Droplet infection |
3. |
Elephantiasis |
Wuchereria bancrofti |
infected water and food |
4. |
Malaria |
Plasmodium vivax |
Bite of male anopheles mosquito |
A cloning vector has two antibiotic resistance genes- for tetracycline and ampicillin. A foreign DNA was inserted into the tetracycline gene. Non-recombinants transformants would survive on the medium containing:
1. ampicillin but not tetracycline
2. tetracycline but not ampicillin
3. both tetracycline and ampicillin
4. neither tetracycline nor ampicillin
Cancerous cells can easily be destroyed by radiation due to the:
1. Rapid cell division
2. Lack of nutrition
3. Fast mutation
4. Lack of oxygen
1. | cross-hybridisation among the selected parents |
2. | evaluation and selection of parents |
3. | germplasm collection |
4. | selection of superior recombinants |
Select the correct statement from the ones given below:
1. | Morphine is often given to persons who have undergone surgery as a painkiller. |
2. | Chewing tobacco lowers blood pressure and heart rate. |
3. | Cocaine is given to patients after surgery as it stimulates recovery. |
4. | Barbiturates when given to criminals make them tell the truth. |
At which stage of HIV infection does one usually shows symptoms of AIDS?
1. | When viral DNA is produced by reverse transcriptase. |
2. | When HIV replicates rapidly in helper T-lymphocytes and damages a large number of these. |
3. | Within 15 days of sexual contact with an infected person. |
4. | When the infecting retrovirus enters host cells. |
Which of the following is not a step in Multiple Ovulation Embryo Transfer Technology (MOET)?
1. Cow is fertilized by artificial insemination
2. Fertilized eggs are transferred to surrogate mothers at 8-32 cell stage
3. Cow is administered hormone having LH like activity for super ovulation
4. Cow yields about 6-8 eggs at a time
Colostrum, the yellowish fluid, secreted by mother during the initial days of lactation is very essential to impart immunity to newborn infants because it contains:
1. | Immunoglobulin A |
2. | Natural killer cells |
3. | Monocytes |
4. | Macrophages |
Grafted kidney may be rejected in a patient due to:
1. Cell-mediated immune response
2. Passive immune response
3. Innate immune response
4. Humoral immune response
Match the following list of bacteria and their commercially important products:
Bacterium | Product | ||
A. | Aspergillus niger | i. | Lactic acid |
B. | Acetobacter aceti | ii. | Butyric acid |
C. | Clostridium butylicum | iii. | Acetic acid |
D. | Lactobacillus | iv. | Citric acid |
Choose the correct match:
A | B | C | D | |
1. | ii | iii | iv | i |
2. | ii | iv | iii | i |
3. | iv | iii | ii | i |
4. | iv | i | iii | ii |
The best method for animals that are below average in productivity in milk production is:
1. Inbreeding
2. Out-crossing
3. Cross-breeding
4. Interspecific hybridization
The primary treatment of wastewater involves the removal of:
1. | dissolved impurities | 2. | stable particles |
3. | toxic substances | 4. | harmful bacteria |
The best explants for obtaining virus-free plants in micropropagation are:
1. | Meristems |
2. | Embryos |
3. | Anther |
4. | Permanent tissue |
Which of the following alcoholic drinks are produced without distillation?
1. Whiskey and Brandy
2. Brandy and Rum
3. Wine and Beer
4. Wine and Brandy
‘Competence’ for transformation can be induced in certain bacteria if they are treated with:
1. | Specific concentration of divalent cation like calcium |
2. | Polyethylene glycol |
3. | Cellulase to create protoplast |
4. | Colchicine |
Silencing of mRNA has been used in producing transgenic plants resistant to:
1. | Bollworms | 2. | Nematodes |
3. | White rusts | 4. | Bacterial blights |
What is the criterion for DNA fragments movement on agarose gel during gel electrophoresis?
1. | The larger the fragment size, the farther it moves |
2. | The smaller the fragment size, the farther it moves |
3. | Positive charged fragment moves to farther end |
4. | Negatively charged fragments do not move |
Elution is:
1. | separating the restricted DNA fragments on agarose gel |
2. | staining the separated DNA fragments with ethidium bromide |
3. | cutting out of the separated bands of DNA from the agarose gel and extracting them from the gel piece |
4. | constructing rDNA by joining the purified DNA fragments to the cloning vector |
Corn borer in cotton can be controlled by the proteins encoded by the gene:
1. cryIAc
2. cryIIAb
3. cryIAb
4. cryIIAc
DNA precipitation out of a mixture of biomolecules can be achieved by treatment with:
1. | Chilled chloroform |
2. | isopropanal |
3. | Chilled ethanol |
4. | Methanol at room temperature |
The exploitation of bioresources of a nation by multinational companies without authorization from the concerned country is referred to as:
1. Bioweapon
2. Biopiracy
3. Bioethics
4. Biowar
Which of the following is not an application of PCR (Polymerase Chain Reaction)?
1. Purification of isolated protein
2. Detection of gene mutation
3. Molecular diagnosis
4. Gene amplification
1. | Flavr savr tomatoes |
2. | Starlink maize |
3. | Bt soybean |
4. | Golden rice |
Epiphytes:
1. are aerial vines common in tropical regions
2. are parasitic and use haustoria
3. live in oligotrophic soil and digest insects to obtain nitrogen
4. grow on other plants but do not obtain nutrients from their hosts
Inspite of interspecific competition in nature, which mechanism the competing species might have evolved for their survival?
1. | Mutualism |
2. | Predation |
3. | Resource partitioning |
4. | Competitive release |
Ecological niche is:(NCERT Exemplar)
1. The surface area of the ocean
2. An ecologically adapted zone
3. The physical position and functional role of a species within the community
4. Formed of all plants and animals living at the bottom of a lake
If the mean and the median pertaining to a certain character of a population are of the same value, the following is most likely to occur:
1. a normal distribution
2. a bi-modal distribution
3. a T-shaped curve
4. a skewed curve
Earliest vascular plants on land acquired water and mineral nutrients most likely by:
1. absorption by trichomes.
2. diffusion through stomata.
3. the help of symbiotic mycorrhizae.
4. osmosis through the root hairs.
Just as a person moves from Delhi to Shimla to escape the heat for the duration of hot summer, thousands of migratory birds from Siberia and other extremely cold northern regions move to:
1. Western Ghat
2. Meghalaya
3. Corbett National Park
4. Keoladeo National Park
According to Alexander von Humboldt :
(1) Species richness decreases with increasing area of exploration
(2) Species richness increases with the increasing area, but only up to limit
(3) There is no relationship between species richness and area explored.
(4) Species richness goes on increasing with increasing area of exploration
Exploration of molecular, genetic, and species level diversity for novel products of economic importance is known as:
1. Biopiracy
2. Bioenergetics
3. Bioremediation
4. Bioprospecting
An example of ex-situ conservation is:
1. National park
2. Seed bank
3. Wildlife sanctuary
4. Sacred grove
Assertion (A): | A person goes to a high altitude and experiences 'altitude sickness' with symptoms like breathing difficulty and heart palpitations. |
Reason (R): | Due to low atmospheric pressure at high altitudes, the body does not get sufficient oxygen. |
In light of the above statements, choose the correct answer from the options given below.
1. | (A) is true but (R) is false. |
2. | (A) is false but (R) is true. |
3. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
4. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
The biomass available for consumption by the herbivores and the decomposers is called
1. Secondary productivity
2. Standing crop
3. Gross primary productivity
4. Net primary productivity
The amount of nutrients, such as carbon, nitrogen, phosphorus, calcium, etc. present in the soil at any given time, is referred to as the-
1. Nutrient status of a soil
2. Standing state
3. Standing crop
4. Mineral state.
Match the trophic levels with their correct species examples in the green land ecosystem:
Column I | Column II | ||
(1) | Fourth trophic level | (i) | Cow |
(2) | Second trophic level | (ii) | Vulture |
(3) | First trophic level | (iii) | Rabbit |
(4) | Third trophic level | (iv) | Grass |
Select the correct option:
(a) | (b) | (c) | (d) | |
1. | (iii) | (ii) | (i) | (iv) |
2. | (iv) | (iii) | (ii) | (i) |
3. | (i) | (ii) | (iii) | (iv) |
4. | (ii) | (iii) | (iv) | (i) |
The correct sequence of seral stages in primary hydrarch succession [pioneer to climax] would be:
1. | Phytoplankton, Submerged plant stage, Submerged free floating plant stage, Reed swamp stage, Marsh-meadow stage, Scrub stage, Forest |
2. | Phytoplankton, Submerged free floating plant stage, Submerged plant stage, Reed swamp stage, Marsh-meadow stage, Scrub stage, Forest |
3. | Phytoplankton, Submerged plant stage, Submerged free floating plant stage, Marsh-meadow stage, Reed swamp stage, Scrub stage, Forest |
4. | Phytoplankton, Reed swamp stage, Marsh-meadow stage, Submerged plant stage, Submerged free floating plant stage, Scrub stage, Forest |
Which of the following is the most important cause of animals and plants being driven to extinction?
1. Co - extinctions
2. Over - exploitation
3. Alien species invasion
4. Habitat loss and fragmentation
The phosphorus cycle is unusual in that its major reservoir is:
1. aquifers
2. soil and rocks
3. the atmosphere
4. clouds
According to Robert May, global species diversity is about:
1. 20 Million
2. 50 Million
3. 7 Million
4. 1.5 Million
The extent of the global diversity of invertebrates is represented in the image below. Choose the correct combination of groups (A-D) respectively:
A | B | C | D | |
1. | Insects | Crustaceans | Other animal groups | Molluscs |
2. | Crustaceans | Insects | Molluscs | Other animal groups |
3. | Molluscs | Other animal groups | Crustaceans | Insects |
4 | Insects | Molluscs | Crustaceans | Other animal groups |
A scrubber in the exhaust of a chemical industrial plant removes:
1. Gases like sulphur dioxide
2. Particulate matter of the size 5 micrometer or above
3. Gases like ozone and methane
4. Particulate matter of the size 2.5 micrometer or less
The correct descending order of the relative contribution of various greenhouse gases to total global warming is:
1. | carbon dioxide; methane; nitrous oxide; CFCs |
2. | carbon dioxide; CFCs; methane; nitrous oxide |
3. | carbon dioxide; CFCs; nitrous oxide; methane |
4. | carbon dioxide; methane; CFCs; nitrous oxide |
Deforestation can lead to all of the following except:
1. | An increase in atmospheric carbon dioxide as trees can hold a lot of carbon in their biomass. |
2. | Loss of biodiversity due to habitat destruction. |
3. | A wetter climate as trees can hold a lot of water. |
4. | Soil erosion due to loss of the protective layer of vegetation. |
Which of the following is an innovative remedy for plastic waste?
1. | Burning in the absence of oxygen |
2. | Burying 500 m deep below the soil surface |
3. | Polyblend |
4. | Electrostatic precipitator |
"Good ozone" is found in the:
1. Mesosphere
2. Troposphere
3. Stratosphere
4. Ionosphere