CBSE 12TH BIOLOGY - Online Test
Q1.
Air pollution is:
i. 5th leading cause of deaths in Indian sub-continent.
ii. ranked among top 10 killers in the world.
iii. 7th most dangerous killer in south Asia.
Answer : Option A
Explaination / Solution:
Air pollution causes a number of respiratory disease including lung cancer. It is the 5th leading causes of deaths in Indian sub-constinent and 7th most dangerous killer in south Asia.
Q2. Reproduction is an essential life process, which help in
Answer : Option D
Explaination / Solution:
During reproduction, new individuals are produced having similar traits that help in continuity of species. It is essential as all living organisms have fixed life span.
Q3. The techniques of using live organisms of enzymes from organism to produce products and processes useful to human is called
Answer : Option A
Explaination / Solution:
Biotechnology is the use of living systems and organisms to develop or make products, or "any technological application that uses biological systems, living organisms, or derivatives thereof, to make or modify products or processes for specific use".
Q4. Evolution is
Answer : Option C
Explaination / Solution:
Evolution is the gradual change of race due to variation is course of time. It is the history and development of race along with variations. Evolution is a continuous process and takes millions of years to evolve a new species.
Q5. Father of green revolution is
Answer : Option A
Explaination / Solution:
M.S. Swaminathan is known as father of green revolution. Green revolution increased the food production about three times the previous one. Use of hybrid seeds, fertilizers and modern method of agriculture results this achievement.
Q6. RCH stands for
Answer : Option B
Explaination / Solution:
RCH stands for reproductive and child health care. Creating awareness among the people about different aspects of reproduction and available facility for child health care is the main aim of this programme.
Q7. Which of the following is/are poikilotherm:
Answer : Option C
Explaination / Solution:
The organisms that can change their body temperature according to environment are called poiklotherm or cold blooded animals. Tapeworm and naked mole rat are examples of cold blooded animals.
Q8. Motile zygote of Plasmodium occurs in
Answer : Option C
Explaination / Solution:
Plasmodium completes their life cycle in two hosts, female anopheles and human beings. The motile zygote of plasmodium occurs in gut of female anopheles, which get transferred to human being during mosquito bite.
Q9. Name the conjugated protein used as genetic material in living cells
Answer : Option D
Explaination / Solution:
Nucleoprotein, conjugated protein consisting of a protein linked to a nucleic acid, either DNA (deoxyribonucleic acid) or RNA (ribonucleic acid). The protein combined with DNA is commonly either histone or protamine; the resulting nucleoproteins are found in chromosomes.
Q10. Which of the following is correct:
Answer : Option C
Explaination / Solution:
Net primary productivity (NPP) is equal to Gross primary productivity (GPP) minus Respiration loss (R). NPP is the available biomass for the consumption of heterotrophs in the ecosystem.
