CBSE 12TH BIOLOGY - Online Test
Q1. A person with unknown blood group under ABO system has suffered much blood loss in an accident and needs immediate blood transfusion. His one friend, who has a valid certificate of his own blood type, offers for blood donation without delay. What would have been the type of blood group of the donor friend?
Answer : Option D
Explaination / Solution:
A person with unknown blood group under ABO grouping should be given Type O blood group as O is universal donor and can be transfused to any person.
Q2. Secondary treatment of sewage is also called
Answer : Option C
Explaination / Solution:
Secondary treatment of sewage is also called biological treatment because in this treatment aeration of sewage water is done that increase the microbes that decompose the organic materials in sewage water.
Q3. Low BOD will be characteristic feature of :
Answer : Option B
Explaination / Solution:
Low biological oxygen demand (BOD) will be characteristic feature of an oligotrophic lake. In oligotrophic lake concentration of nutrients are very low so a few organisms only survive and BOD is comparatively low.
Q4. In some plants diploid embryo sac develop directly from diploid megaspore mother cell. This condition is called as Megaspore mother cell are diploid, which generally undergo reduction division to produce megaspore but in some plants diploid megaspore mother cell directly produce diploid embryo sac this condition is called diplospory
Answer : Option D
Explaination / Solution:
Megaspore mother cell are diploid, which generally undergo reduction division to produce megaspore but in some plants diploid megaspore mother cell directly produce diploid embryo sac this condition is called diplospory
Q5. Proteins can be digested by
Answer : Option C
Explaination / Solution:
Proteases are involved in digesting long protein chains into shorter fragments by splitting the peptide bonds that link amino acid residues.
Protein can be digested by using enzyme protease to obtain DNA. In chromosome DNA is wrapped on histone protein.
Q6. Which of the following are not the examples of analogous structures?
Answer : Option C
Explaination / Solution:
Analogous structure is that structure which performs similar function in spite of different origin. Wings of bat and forelimb of cattle do not perform same function and have common origin.
Q7.
Identify the figure given below:-
Answer : Option A
Explaination / Solution:
Rhizome of ginger is modified root, located inside the soil parallel to earth surface. Vegetative propagation of ginger is done with it.
Q8. The American company which is involved in the manufacturing of Humulin is
Answer : Option C
Explaination / Solution:
In 1983, Eli Lilly an American company, first prepared two DNA sequences corresponding to A and В chains of human insulin and introduced them in plasmids of Escherichia coli to produce insulin chains. Chains A and В were produced separately, extracted and combined by creating disulfide bonds to form human insulin (humulin).
Q9. It is a disease which affects the mucus membrane of urogenital tract in male and yellow discharge in urine with feeling of illness.
Answer : Option C
Explaination / Solution:
Gonorrhea affects the urogenital tract of male and female both. In male yellow discharge comes out along with urine with itching and irritation.
Q10. In which of the following interaction/s one species is benefitted while other is harmed?
Answer : Option D
Explaination / Solution:
In predation and parasitism one species is benefitted while other is harmed. Parasite obtain food from host by harming them.
