CBSE 12TH BIOLOGY - Online Test
Q1. The tendency of offspring to differ from parents is called
Answer : Option C
Explaination / Solution:
Variation is the tendency of offspring to differ from its parents. Variation occurs due to change in genetic makeup of offsprings.
Q2. Yeast is used in the production of
Answer : Option C
Explaination / Solution:
Yeast is used in the production of bread and beer. Beer production involves production of ethyl alcohol. Bread is produced by fermentation process.
Q3. An amendment in Air (Prevention and control of Pollution) Act1981 included a new pollutant named :
Answer : Option C
Explaination / Solution:
The Air (Prevention and Control of Pollution) Act, 1981 an Act of the Parliament of India to control and prevent air pollution in india. It was amended in 1987.
There are some definations of the act.
Definitions. – In this Act, unless the context otherwise requires,
- “air pollutant” means any solid, liquid or gaseous substance (including noise)] present in the atmosphere in such concentration as may be or tend to be injurious to human beings or other living creatures or plants or property or environment;
- “air pollution” means the presence in the atmosphere of any air pollutant;
- “approved appliance” means any equipment or gadget used for the burning of any combustible material or for generating or consuming any fume, gas or particulate matter and approved by the State Board for the purposes of this Act;
Q4. The living organism can be unexceptionally differ from non-living on the basis of
Answer : Option A
Explaination / Solution:
The living and non-living shows a number of different features including respiration, nutrition, growth and stimulus but reproduction is most distinctive feature to classify into living and non-living.
Q5. Phage is a
Answer : Option A
Explaination / Solution:
Phage is a virus that infects bacteria. Such viruses transfer their genetic materials into host bacteria and using the bacterial machinery increase in number and multiply rapidly to kill host cells.
Q6. Who performed the famous experiment to prove origin of life?
Answer : Option A
Explaination / Solution:
The famous experiment to prove the origin of life from inorganic substance was performed by Urey and Miller in 1953 by creating similar condition in laboratory as earth would be at the time of origin of life.
Q7. RNAi is used to produce resistance against the nematode
Answer : Option D
Explaination / Solution:
RNA interference (RNAi) is present in all eukaryotic organisms as a method of cellular defense.
When Meloidogyne incognita (parasite) consumes cells with RNAi gene, parasite cannot survive and this prevents infestation. The introduced RNAi gene DNA forms both sense and anti-sense RNA. Two strands being complementary to each other bend and form ds RNA, leading to RNAi. Thus, the mRNA of nematode is silenced and the parasite cannot survive there.
Q8. Indian population is
Answer : Option D
Explaination / Solution:
The Indian population is young population as large number of population belongs to age group of 35 to 50 years.
Q9. Any habitat can support growth of limited number of individuals only called:
Answer : Option C
Explaination / Solution:
Carrying capacity of a habitat is the maximum number of individual that can survive in given habit. There is a limitation of food, water and space in a habitat so only limited numbers of individual survive.
Q10. From what Lysergic acid is formed?
Answer : Option C
Explaination / Solution:
Lysergic acid is formed by ergot fungi. Ergot fungi refers to a group of fungi of genus Claviceps. The most common is Clevicepspurpuea. It cause ergotism in man and other mammals.
