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?
During a short circuit, the current in the circuit -
What is the S.I. unit of resistance?
Which type of mirror is used by dentists to examine teeth?
Name a nitrogenous excretory product present in human urine.
What is a synapse?
Write the full form of ATP.
Where is a gene located?
Name two sexually transmitted diseases (STDs).
What is a stomata? Write the function of stomata.
Why is energy flow in an ecosystem unidirectional?
What is a fossil?
Mention the importance of fossils.
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 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.
Mention one function of the placenta.
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.
Write two differences between arteries and veins.