HSC Science (General) 12th Standard Board Exam - Maharashtra State Board Important Questions for Biology

Name the causative organism and preventive measures for Typhoid

Mention any four benefits of biogas.

Mention a product for human welfare obtained with the help of the following microbe:

Propionibacterium shermanii

Define the following term:

Commensalism

Give an account of polyembryony.

Explain any two contrivances or outbreeding devices for pollination.

Describe any three adaptations in anemophilous flowers.

With the help of a neat, labelled diagram describe the human male reproductive system.

Describe the T.S. of human testis

Write a note on human sperm

Identify the IUD in the given diagram.

Identify the parts labelled in the given diagram.

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.

Expand the term ZIFT.

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.

What is the reason for the 21^st trisomy?