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

Describe the process of spermatogenesis with the help of diagram.

When the ELISA test was conducted on an immune-suppressed person, he tested positive for a pathogen.

1. Identify the disease the patient is suffering from.
2. Name the causative entity. 
3. Mention the cells of the body that are attacked by the pathogen.

Explain the mode of transmission of HIV.

Identify the trophoblast cells which are in contact with the embryonal knob during blastulation.

Identify A, B, C, D, in the given diagram of the human reproductive system:

Sketch and label Human Male Reproductive System.

Write briefly about the Testis.

Which of the following is a hormone-releasing contraceptive?

Draw a neat and labelled diagram of spermatogenesis.

Give any four significances of fertilization in humans.

Mention the names of any two organs each derived from ectoderm and mesoderm.

Write the long form of GIFT.

In absence of fertilization, corpus luteum degenerates into ______.

Distinguish between human sperm and ovum.

Why the ratio in pleiotropy is 2 : 1? Explain it with an example.

If centromere is situated in the middle of the chromosome, it is called ________.

(a) Metacentric

(b) Acrocentric

(c) Submetacentric

(d) Telocentric

Give the genotype of Turner’s syndrome.

If the number of chromosomes in an endosperm cell is 27, what will be the chromosome number in the definitive nucleus?

1. 9
2. 18
3. 27
4. 36

If only one 'X' chromosome is found in a female person, which of the following symptoms she will show?

1. epicanthal skin fold
2. webbing of neck
3. small testis and absence of spermatogenesis
4. presence of simian crease on the palm

Which of the following is NOT an example of connecting link?

1. Archaeopteryx
2. fchthyostegia
3. Seymouria
4. Biston betularia