Biology - Online Test
Q1. The plant cell wall are made up of
Answer : Option B
Explaination / Solution:
Plant cell walls are made of cellulose. Paper made from plant pulp is cellulose.
Q2. The stage for counting of chromosome is
Answer : Option D
Explaination / Solution:
During cell division, chromosomes get condensed in shape. In metaphase stage of mitosis, the chromosomes are located at center of cell in linear fashion. It can be easily studied at this stage.
Q3. Which one of the following is not used in organic farming?
Answer : Option C
Explaination / Solution:
In organic farming snail is not used. Glomus is kind of fungi used in organic farming for maintaining fertility of soil. Earthworm the process of composting to form vermiform compost and Oscillatoria is an algae that fix the nitrogen.
Q4. Angina pectoris is very often mistaken for :
Answer : Option C
Explaination / Solution:
Angina pectoris is the sensation of chest pain, pressure or squeezing or pain in the centre of the chest. These symptoms are often mistaken by indigestion.
Q5. Two molecules of pyruvate are completely degraded in Krebs cycle to form
Answer : Option A
Explaination / Solution:
In kreb cycle glucose has been broken down to release carbon dioxide and eight molecules of NADH2; two of FADH2 have been synthesised besides just two molecules of ATP.
Q6. Which of the following can be categorised as a biological pollutant
Answer : Option D
Explaination / Solution:
Mildew is thin white coating consisting of minute fungal hyphae growing on woods, leather or paper. It is a biological pollutant. Heavy metal, industry wastes and organophosphates are physical components.
Q7. Crossing over results in exchange of genetic material, which occurs between
Answer : Option C
Explaination / Solution:
Crossing over is the exchange of genetic material between non-sister chromatids of two homologous chromosomes involved in the pairing process.
Q8. Production of large scale recombinant products can be done in
Answer : Option B
Explaination / Solution:
Bioreactor is a large vessels in which large scale raw materials are biologically converted into specific products.
Bioreactor is used to produce large scale production.
Q9. Urea cycle operates in :
Answer : Option A
Explaination / Solution:
Urea cycles operates in liver, where ammonia is converted into urea. Sometimes urea cycle also occurs in kidney.
Q10. Assertion: The earliest organisms that appeared on the earth were non-green and presumably anaerobes.
Reason: The first autotrophic organisms were the chemo-autotrophs that never released oxygen.
Reason: The first autotrophic organisms were the chemo-autotrophs that never released oxygen.
Answer : Option D
Explaination / Solution:
Primitive earth was devoid of oxygen so, only those organisms that were able to survive within anaerobic conditions developed. All these were heterotrophic organisms (taking nutrients from outside). Then after autotrophic organisms were developed that used inorganic sources such as H2S,NH3,CH4 as the principle sources of energy. These oganisms are called chemo-autotrophs.
