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

Name any two antibiotics with their microbial source.

Photoreceptor cells are present in __________.

(A) blind spot

(B) retina

(C) cochlea

(D) cornea

The micro-organism used in the production of acetic acid is ______.

a·1 antitrypsin is used in the treatment of _______________.

Charas, hashish, ganja are obtained from __________.

What is deforestation?

Give the microbial source of Vit. B₁₂

After puberty human female shows cyclic changes in her reproductive system. Explain structural and hormonal changes in the uterus.

                                      (OR)

Give reasons :
(1) Scrotal sac serves as thermoregulator.
(2) Corpus luteum gets converted into corpus albicans in absence of fertilization.
(3) Missing of menses is the first indication of pregnancy.
(4) Surgical sterilization is a permanent method of birth control. (5) Human egg is microlecithal.

Attempt any TWO of the following: 

Define ‘deforestation’. Comment on its effects

The permanent removal of forests and woodlands is called ---------------

From which microbial sources can pectinase be obtained?

Why is zona pellucid retained around the egg till it reaches the uterus?

Erythromycin is obtained from ______.

Suggest measures to conserve the forests. 

Give the names and functions of enzymes involved in lactose metabolism in E. Coli. 

Name the three ossicles of the middle ear.

Long answer question

Draw the neat labelled diagram of the human ear.

The _______ is also called the womb.

What is the source of cocaine? 

Antibiotic Chloromycetin is obtained from ______.