Science (English Medium) इयत्ता १२ - CBSE Question Bank Solutions for Biology

Which of the following cannot be detected in a developing foetus by amniocentesis?

In which of the following weeks of pregnancy CVS is done?

Which of the following statements is incorrect regarding the medical termination of pregnancy (MTP)?

Surgical methods, also called sterilisation techniques are fool-poof methods be prevent pregnancy. But, it is the last option for many couples, because ______.

MTPs are considered relatively safe during the first 18 weeks of pregnancy.

Substantiate by giving two reasons as to why a holistic understanding of the flora and fauna the cropland is required before introducing an appropriate biocontrol method.

With the decline in the population of fig species it was noticed that the population of wasp species also started to decline. What is the relationship between the two and what could be the possible reason for decline of wasps?

In a pathological lab, a series of steps were undertaken for finding the gene of interest. Describe the steps, or make a flow chart showing the process of amplification of this gene of interest.

The Historic convention on Biological Diversity held in Rio de Janeiro in 1992 is known as ______.

Strict conditions are to be followed in medical termination of pregnancy (MTP) procedures. Mention two reasons.

What are the conditions in which medical termination of pregnancy is advised?

The free-living fungus Trichoderma can be used for ______.

Match the items in Column ‘A’ and Column ‘B’ and choose correct answer.

The correct answer is:

What for Nucleopolyhydro viruses are being used now a days?

Name any genetically modified crop.

How has the bacterium Bacillus thuringiensis helped us in controlling caterpillars of insect pests?

How do microbes reduce the environmental degradation caused by chemicals?

Describe the main ideas behind the biological control of pests and diseases.

Rising of dough is due to ______.

Which of the following contributed in popularising the PCR (polymerase chain reactions) technique?