HSC Science (General) 12th Standard Board Exam - Maharashtra State Board Question Bank Solutions for Biology

Give the genotype of Turner’s syndrome.

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

Give any 'two' names of X-linked diseases

What will be the phenotype of progeny, if a carrier haemophilic female marries a normal male?

The trophoblast cells in contact with embryonal knob are called ___________.

What is ‘syndrome’?

In which of the following disorders number of chromosomes present is 47?
(A) Turner’s syndrome
(B) Cushing’s syndrome
(C) Acquired Immuno - Deficiency Syndrome
(D) Down’s syndrome

Explain the process of early cleavage till the formation of morula.

Describe the changes involved during gastrulation.

Name the disorder caused by under secretion of thyroxine in children

Describe the structure of blastula.

State any two symptoms of Down’s syndrome.

A person is showing symptoms like increased BMR, heart rate, pulse rate, blood pressure and deposition of fats in eye sockets. Name the disease he is suffering from.

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? 

Sketch and label formation of typical spinal nerve. 

Long answer question.

Explain the process of conduction of nerve impulses up to the development of action potential.

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