List of practice Questions

How does CRISPR gene editing help to change the characteristics of an organism?
Analyse the figure given and answer the following questions.
(a) Identify the figure related to clear vision in dim light.
(b) Which muscular activities take place here?
After a wound occurs, several processes that help in blood clotting are initiated.
(a) Which enzyme initiates these reactions?
(b) Explain how the activity of this enzyme helps the clotting mechanism.
Observe the illustration and answer the following questions.
(a) Identify the molecule labelled as ‘X’.
(b) Mention its role in protein synthesis.
A tall round seeded plant (TTRR) is crossed with a dwarf wrinkled seeded plant (ttrr).
(a) Write the genotype and phenotype of F$_1$ plants.
(b) If F$_1$ plants are self-pollinated, write the possible phenotypes in F$_2$.
By giving suitable examples based on the hints, explain there are various situations which differ from Gregor Mendel’s hypothesis.
Hints:
(a) Incomplete dominance
(b) Co-dominance
(c) Polygenic inheritance
Identify the fluid indicated by the statements given below and write any two of its functions.
• It fills the space between the inner layers of the meninges.
• Ependymal cells play a role in the formation of this fluid.
In gene therapy using stem cells, viruses are mainly used as vectors because they:
Mention the advantages of the following technological possibilities in environmental conservation:
(a) Bioremediation
(b) Cryopreservation
Structure of synapse is given. Analyse it and answer the following questions.
(a) Identify the chemical labelled as `X'.
(b) Mention their role in the transmission of impulse to only one direction.
When we feel fear or tension, the heartbeat increases and digestion slows down without our control.
(a) Name the division of the autonomic nervous system that controls these actions.
(b) Write any two other actions controlled by this nervous system during such situations.
A doctor prescribes an antibiotic to a patient and advises continuing the full course even after the symptoms improve.
(a) Identify the type of pathogen that can be destroyed using antibiotics.
(b) Why is stopping the course too early considered a “major concern”?
The steps involved in recombinant DNA technology is illustrated below:
(a) Identify the DNA into which the cut human gene is ligated.
(b) What happens when ‘X’ is inserted into the host cell?
Suggest ways to reduce air pollution in urban areas.
Explain the impact of deforestation on the environment.
What are biodegradable and non-biodegradable wastes? Give two examples of each.
Discuss the role of individuals in protecting the environment.
Which option correctly lists all three components of a single DNA nucleotide?
Which hormone maintains dormancy of seeds until favourable conditions?
Analyse the process of taste detection and choose the correct sequence of steps from the options given:
Steps:
(i) Substances dissolve in saliva.
(ii) Nerves carry impulses to brain.
(iii) Chemoreceptors generate impulses.
(iv) Substances reach the minute pores in the papilla.
Write two effects of the action of man on biodiversity of Earth.
How can private enterprises help in improving cities?
State any two advantages of Tree Planting.
What are the main aims of Integrated Plant Nutrient Management?
Write two important causes of air pollution.