HSC Science (General) इयत्ता १२ वी - Maharashtra State Board Important Questions for Biology

Write a note on human sperm

The number of meiotic and mitotic divisions necessary for development of female gametophyte in angiosperms is ______.

Draw a well labelled diagram of T.S. anther.

Identify the permanent birth control method in given diagram.

Identify the IUD in the given diagram.

Identify the parts labelled in the given diagram.

What is lactation? Which hormone is responsible for its regular secretion?

Human pregnancy shows three prominent trimesters. Answer the following question based on these trimester.

1. What is morning sickness during the first trimester?
2. Name the hormone secreted in the second trimester.
3. The organ which secretes hormone in second trimester is

Describe hormonal control in various phases of the menstrual cycle.

The phenotypic ratio of incomplete dominance is ______.

What is a test cross?

Answer the following questions related to sex determination in human beings:
i. What is sex chromosome?
ii. How many pairs of chromosomes are present in human beings?
iii. How is the sex of the human offspring determined?
iv. Draw a diagram depicting sex determination in man.

Explain the mechanism of sex determination in birds.

Explain the law of independent assortment with a suitable example.

What is the reason for the 21^st trisomy?

Give reasons for the development of Turner’s syndrome and also mention its symptoms.

_______ enzymes are used as biological scissors in r-DNA technology.

(A) Restriction endonucleases

(B) DNA ligases

(C) DNA polymerases

(D) Reverse transcriptases

Explain 'Wobble hypothesis' with the help of a suitable diagram.

Sketch and label lytic cycle.

What is Bacteriophage?