Consider the following kinds of organisms:
1. Bacteria
2. Fungi
3. Flowering plants
some species of which of the above kinds of organisms are employed as biopesticides?
The question asks to identify which of the given organisms (Bacteria, Fungi, Flowering plants) are used as biopesticides. We need to evaluate each category for its application in biological pest control.
D) 1, 2 and 3. As explained above, bacteria (e.g., Bacillus thuringiensis), fungi (e.g., Beauveria bassiana), and flowering plants (e.g., neem, pyrethrum) all have species that are employed as biopesticides.
Biomass gasification is considered to be one of the sustainable solutions to the power crisis in India. In this context, which of the following statements is / are correct?
1. Coconut shells, groundnut shells and rice husk can be used in biomass gasification.
2. The combustible gases generated from biomass gasification consist of Hydrogen and carbon dioxide only.
3. The combustible gases generated from biomass gasification can be used for direct heat generation but not in internal combustion engines.
Select the correct answer using the codes given below:
The question asks to identify the correct statements regarding biomass gasification, a sustainable solution for power generation. We need to evaluate each statement based on the principles and applications of biomass gasification.
Based on the evaluation, only statement 1 is correct.
Correct Option: A) 1 only
What is the role of ultraviolet (UV) radiation in the water purification systems?
1. It inactivates / kills the harmful micro organisms in water.
2. It removes all the undesirable odours from the water.
3. It quickens the sedimentation of solid particles, removes turbidity and improves the clarity of water.
Which of the statements given above is / are correct?
The question asks about the role of ultraviolet (UV) radiation in water purification systems. We need to evaluate each statement to determine its accuracy regarding UV's function.
Based on the evaluation, only statement 1 accurately describes the role of UV radiation in water purification.
Correct Option: A) 1 only
Graphene is frequently in the news recently. What is its importance?
1. It is a two-dimensional material and has good electrical conductivity.
2. It is one of the thinnest but strongest materials tested so far.
3. It is entirely made of silicon and has high optical transparency.
4. It can be used as conducting electrodes required for touch screens, LCDs and organic LEDs.
Which of the statements given above are correct?
1 and 2 only
3 and 4 only
1, 2 and 4 only
1, 2, 3 and 4
The question asks about the importance and properties of Graphene. We need to evaluate each given statement based on the known characteristics of Graphene.
Based on the evaluation, statements 1, 2, and 4 are correct.
Correct Option: C) 1, 2 and 4 only
Lead ingested or inhaled, is a health hazard After the addition of lead to petrol has been banned, what still are the sources of lead poisoning?
1. Smelling units
2. Pens and pencils
3. paints
4. Hair oils and cosmetics
Select the correct answer using the codes given below:
1, 2 and 3 only
1 and 3 only
2 and 4 only
1, 2, 3 and 4
The question asks to identify current sources of lead poisoning, even after lead has been banned from petrol. We need to evaluate each given option to determine if it is a known source of lead exposure.
B) 1 and 3 only
Based on the analysis, smelting units and paints are significant and well-documented sources of lead poisoning. Pens and pencils are generally not a source, and while some hair oils and cosmetics can be, they are not as universally recognized as the primary sources listed in 1 and 3, especially in the context of common exposure after the petrol ban.
With reference to 'stem cells', frequently in the news, Which of the following statements is / are correct?
1. Stem cells can be derived from mammals only.
2. Stem cells can be used for screening new drugs.
3. Stem cells can be used for medical therapies.
Select the correct answer using the codes gives below:
The question asks to identify the correct statements regarding stem cells. We need to evaluate each statement individually based on our knowledge of stem cell biology and applications.
Correct Option: B) Statements 2 and 3 are correct.
Consider the following statements: Chlorofluorocarbons, known as ozone-depleting substances, are used.
1. In the production of plastic foams
2. in the production of tubeless tyres
3. in cleaning certain electronic components
4. as pressurizing agents in aerosol cans
Which of the statements given above is/are correct?
1, 2 and 3 only
4 only
1, 3 and 4 only
1, 2, 3 and 4
The question asks to identify the correct uses of Chlorofluorocarbons (CFCs), which are known ozone-depleting substances. We need to evaluate each given statement based on the historical and industrial applications of CFCs.
Based on this analysis, statements 1, 3, and 4 are correct.
Correct Option: C) 1, 3 and 4 only
A team of scientists at Brookhaven National Laboratory including those from India created the heaviest anti-matter (anti-helium nucleus). What is / are the implication/implications of the creation of anti-matter?
1. It will make mineral prospecting and oil exploration easier and cheaper.
2. It will help probe the possibility of the existence of stars and galaxies made of anti-matter.
3. It will help us understand the evolution of the universe. Select the correct answer using the codes given below:
The question asks about the implications of creating anti-matter, specifically anti-helium nuclei. We need to evaluate each given statement based on our understanding of anti-matter and its scientific significance.
B) 2 and 3 only. Statements 2 and 3 correctly identify significant scientific implications of anti-matter research, particularly in probing cosmic composition and understanding the universe's evolution. Statement 1 is not a practical application of anti-matter.
Which of the following is/are cited by the scientists as evidence/evidences for the continued expansion of the universe?
1. Detection of microwaves in space
2. Observation of redshift phenomenon in space
3. Moment of asteroids in space 4. Occurrence of supernova explosions in space
select the correct answer using the codes given below:
1 and 2
2 only
1, 3 and 4
None of the above can be cited as evidence
The question asks to identify the evidences that support the continued expansion of the universe. We need to evaluate each statement based on established cosmological theories and observations.
A) 1 and 2. Both the Cosmic Microwave Background (CMB) radiation and the observation of redshift are fundamental pillars of the Big Bang theory and provide direct evidence for the expansion of the universe.
Electrically charged particles from space travelling at speed of several hundred km/sec can severely harm living beings if they reach the surface of the Earth. What prevents them from reaching the surface of the Earth?
The Earth's magnetic field diverts them towards its poles.
Ozone layer around the Earth reflects them back to outer space
Moisture in the upper layers of atmosphere prevents them from reaching the surface of the Earth.
None of the statements (a), (b) and (c) given above is correct
The question asks what protects Earth's surface from harmful electrically charged particles from space. This requires knowledge of Earth's natural protective mechanisms against space radiation.
A) The Earth's magnetic field diverts them towards its poles. This statement accurately describes how Earth's magnetic field protects the planet from charged particles by deflecting them towards the poles, preventing them from reaching the surface.