Class 12 Biology 2025 Board Exam

Pollen grains of water pollinated species have special characteristics to protect them. Mention any two such characteristics.
[Max Marks: 1 | Sets: 57/1/2]

Out of the accessory ducts in males, name the duct which helps in the transportation of sperms from the testis to outside of the body.
[Max Marks: 1 | Sets: 57/1/3]

Give the reason for the failure of fertilisation in a flower when the pollen and the ovules of that flower mature at different times.
[Max Marks: 1 | Sets: 57/2/2]

An amniocentesis is recommended for pregnant women above the age of 40 years to check for the possibilities of :
[Max Marks: 1 | Sets: 57/2/1]

The secretion of acrosome helps the sperm enter into the cytoplasm of the ovum through :
[Max Marks: 1 | Set: 57/2/3]

'Saheli' is a once a week oral pill with very few side effects and high contraceptive value. Which one of the following is used in its preparation ?
[Max Marks: 1 | Sets: 57/2/1]

Which of the following is an in-situ conservation strategy ?
[Max Marks: 1 | Set: 57/1/3]

List any two natural methods of birth control. State the principle that is followed while using natural methods.
[Max Marks: 2 | Sets: 57/2/2]

Which one of the following plants can serve as a good material for studies on stages of reduction division ?
[Max Marks: 1 | Set: 57/1/3]

Analyse the significance of performing amniocentesis on a pregnant woman.
[Max Marks: 2 | Set: 57/2/3]