Biology - Online Test
Q1. One of the alternate sources of proteins for animal and human nutrition is
Answer : Option A
Explaination / Solution:
Protein requirement for human beings can be fulfilled by single cell protein in which algae like Spiruline is grown on large scale having high protein contents.
Q2.
If the outermost circle in the shown figure indicates manipulative zone of biosphere reserve then 1& 2 represent:
Answer : Option A
Explaination / Solution:
Biosphere reserves are divided into a number of zone. The outer most circle of biosphere represent manipulative zone followed by buffer zone and core zone respectively from outside to inside.
Q3. Which of the following scientists won the nobel prize for discovering second messengers?
Answer : Option D
Explaination / Solution:
Second messengers are molecules that relay signals received at receptors on the cell surface to trigger physiological changes.
The Nobel Prize in Physiology or Medicine 1971 was awarded to Earl W. Sutherland, Jr. "for his discoveries concerning the mechanisms of the action of hormones".
Q4. A fish that has electric organ is
Answer : Option A
Explaination / Solution:
Torpedo fish has electric organ. They are known for being capable of producing an electric discharge ranging from 8 to 220 volts depending on species.
Q5. Scrotal sacs of man and rabbit are connected with the abdominal cavity by
Answer : Option B
Explaination / Solution:
Scrotal sac contains testes in male. Scrotal sacs are connected with the abdominal cavity by inguinal canal which is a passage in the anterior abdominal wall which in man conveys the spermatic cord.
Q6. Identify the correct pairing between nitrogen bases in DNA.
Answer : Option C
Explaination / Solution:
There are two hydrogen bonds between A and T pairing. There are three hydrogen bonds between G andC pairing. Each strand appears like a helical staircase.
Q7. The phenomenon of exchange of segments of chromosome between paternal and maternal chromosome is called
Answer : Option C
Explaination / Solution:
The exchange of segments of chromosome between homologous chromosomes during reduction division is called crossing over. It creates variation in the individuals of same parents.
Q8. Which one of the following is used as biological insecticide?
Answer : Option D
Explaination / Solution:
Tiger beetle is a large group of beetles known for their aggressive predatory habits and running speed. They are used as biological insecticides in organic farming practices.
Q9.
When a person suffers from chest pain :
i. the reason for this suffering is decreased blood flow and simultaneously lowered oxygen supply to an area of the heart.
ii. deprived of oxygen, myocardium opts for alternative pathways i.e. anaerobic respiration and its byproduct ethanol causes the pain.
Answer : Option D
Explaination / Solution:
A symptom of acute chest pain appears when no enough oxygen is reaching the heart muscle.
Q10. Cellular respiration first takes place in
Answer : Option C
Explaination / Solution:
Cellular respiration takes place in two steps- Glycolysis and Kreb’s cycle. Glycolysis occurs in cytoplasm of cells and Kreb’s cycle in mitochondria. So, first step of respiration takes place in cytoplasm.
