List of top Questions asked in TBSE Class X Board

Why is the use of iodized salt logical/recommended?
To get a real image of the same size as the object, where should the object be placed in front of a convex lens?
The action of which of the following changes the focal length of the eye lens?
Which type of mirror is used by dentists to examine teeth?
Where is a gene located?
Write the full form of ATP.
Name a nitrogenous excretory product present in human urine.
What is a synapse?
Name two sexually transmitted diseases (STDs).
Match the following modes of asexual reproduction with their respective organisms:
(i) Budding
(ii) Regeneration
(iii) Binary fission
(iv) Multiple fission
Options to match with: (a) Planaria, (b) Leishmania, (c) Plasmodium, (d) Yeast
What is a fossil?
Mention the importance of fossils.
Why is energy flow in an ecosystem unidirectional?
What do you mean by reflex arc? Draw a simple reflex arc and label the following parts: (i) Receptor (ii) Sensory nerve (iii) Motor nerve (iv) Effector.
What is excretion?
Draw a labeled diagram of the human excretory system.
What is the phenotypic ratio of a dihybrid cross in the F2 generation?
If an 'X' chromosome-bearing sperm fertilizes an egg, what will be the sex of the child?
What is the increase in the concentration of pollutants at the highest trophic level called?
Write the full form of UNEP.
What is a food chain?
Mention one function of the placenta.
Write two differences between arteries and veins.
The chemical substance responsible for the depletion of the ozone layer is -
Where is bile synthesized?