Biology - Online Test
Q1. Write and codon for anticodon on the t-RNA
Answer : Option B
Explaination / Solution:
The codon for anticodon UCA on t-RNA is AGU. U bonds with A and G bonds with U in RNA. t-RNA carries specific amino acids to form protein molecules.
Q2. In Molluscs, the rasping feeding organ is
Answer : Option D
Explaination / Solution:
The mouth of molluscs contains a file-like rasping organ for feeding, called radula.
Q3. Oogenesis starts
Answer : Option B
Explaination / Solution:
In female baby, oogenesis starts before the birth of baby after forming primary oocyte. Further development to ovum occurs after attaining puberty.
Q4. Deforestation is responsible for
Answer : Option B
Explaination / Solution:
Forests are habitat of large number of plants and animals along with microbes. Deforestation causes loss of habit and loss of speies living in that area that results into co-extinction.
Q5. Astral body are formed of
Answer : Option C
Explaination / Solution:
Astral body are formed of microtubules. Astral bodies are produced by centriolar division proir to start of during cell division and attach with centromere of the chromosome during.
Q6. How is extinction represented in a tree diagram?
Answer : Option B
Explaination / Solution:
In a tree diagram, the extinction is represented as a branch ends that further do not divide any more. Extinction may be due to changed climatic condition or loss of ecological niche.
Q7. Which of the following is a living fossil?
Answer : Option D
Explaination / Solution:
Cycas, a gymnosperm is called the living fossil because they have been evolved in Jurassic period and still survive in present climatic condition.
Q8. Living organisms are classified because of
Answer : Option C
Explaination / Solution:
Living organisms are classified according to certain criteria for easy identification and study of organism. As the number of organisms are very large, it is not possible to study about each and every organism without classification.
Q9. Which one is not a natural methods birth control
Answer : Option C
Explaination / Solution:
Tubectomy is not a natural method of birth control. In tubectomy method fallopian tube of female is cut and tide to prevent ovulation. To abstain, coitus interrupts and rhythm period is natural method of birth control.
Q10. The correct order of digestive system of frog is
Answer : Option A
Explaination / Solution:
The digestive system of frog begins from the mouth which opens into the buccal cavity that leads to the oesophagus through pharynx. Oesophagus is a short tube that opens into the stomach which in turn continues as the intestine and then rectum. The rectum finally opens outside by the cloaca through cloacal aperture.
