Board Paper of Class 12-Science 2019 Biology All India(Set 3) - Solutions
General Instructions :
(i) There are total 27 questions and four sections in the question paper. All questions are compulsory.
(ii) Section A contains questions number 1 to 5, very short answer type questions of one mark each.
(iii) Section B contains questions number 6 to 12, short answer type I questions of two marks each.
(iv) Section C contains questions number 13 to 24, short answer type II questions of three marks each.
(v) Section D contains question number 25 to 27, long answer type questions of five marks each.
(vii) There is no overall choice in the question paper, however, an internal choice is provided in two questions of one mark, two questions of two marks, four questions of three marks and all the three questions of five marks. In these questions, an examinee is to attempt any one of the two given alternatives.
(vii) Wherever necessary, the diagram drawn should be neat and properly labelled.
- Question 1
- Question 2
How are the members of genus Glomus useful to organic farmers? VIEW SOLUTION
- Question 3
The diploid number of chromosomes in an angiospermic plant is 16. What will be the number of chromosomes in its endosperm and antipodal cells?ORState the reason why pollen grains lose their viability when the tapetum in the anther is malfunctioning. VIEW SOLUTION
- Question 4
Biotechnological techniques can help to diagnose the pathogen much before the symptoms of the disease appear in the patient. Suggest any two such techniques.ORMention the form in which inactive protein toxin is produced by Bacillus thuringiensis. How does it get activated in the pest body to kill it? VIEW SOLUTION
- Question 5
Name the disorder in humans with the following karyotype:
(a) 22 pairs of autosomes + XO
(b) 22 pairs of autosomes + 21st chromosome + XY VIEW SOLUTION
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