HSC Science (General) १२ वीं कक्षा - Maharashtra State Board Question Bank Solutions for Biology

State any two symptoms of Down’s syndrome.

Attempt any TWO of the following: 

‘The gene for sickle cell anaemia in homozygous condition is lethal and produces sickle cell trait in heterozygous carrier’. Explain. 

Give the importance of heterocyst in cyanobateria.

Which of the following traits is never observed in a human female? 

What do sex linked traits appear in males than in females? 

Short answer question

Explain how the adrenal medulla and sympathetic nervous system function as a closely integrated system.

Attachment of embryo to the wall of the uterus is known as ______.

Answer in one sentence.

Where does fertilization and implantation occur?

Answer in one sentence.

Give two differences between blastula and gastrula.

Answer in one sentence.

What is the difference between embryo and zygote?

Describe in brief, an account of disorders of the adrenal gland.

What is the source of cocaine? 

Long answer question.

Explain the process by which zygote divides and re-divides to form the morula.

Very Short Answer Question.

Give an example of a chromosomal disorder caused due to nondisjunction of autosomes.

Match the column-I with column-II and re-write the matching pairs.

______ is a mineralocorticoid secreted by Adrenal gland.

Describe any two hormones produced by the ovaries.

Name the glucocorticoid used in treatment of allergy and why?

Answer the questions after observing the diagram given below.

1. What acts as the first messenger?
2. Why can’t hormones like catecholamines enter their target cells through plasma membrane?
3. Name the mode of hormone action shown in the diagram.

Name the embryonic layer from which heart, blood, and blood vessels develop.