Biology - Online Test
Q1. The three domains system do not includes
Answer : Option A
Explaination / Solution:
Three kingdom or domain system of classification do not includes viral domain. Virus were discovered after invention of electron microscope so, they were not the part of living world.
Q2.
Read the following statements about CCK :
i. this hormone stimulates gastrointestinal motility and pancreatic endocrine function.
ii. this hormone stimulates release of bile from gall bladder.
Answer : Option D
Explaination / Solution:
Cholecystokinin, previously called pancreozymin, is synthesized and secreted by enteroendocrine cells in the duodenum, the first segment of the small intestine.
Its presence causes the release of digestive enzymes and bile from the pancreas and gallbladder, respectively, and also acts as a hunger suppressant.
Q3. Fevicol is a synthetic sticky substance insoluble in water. It is a type of…
Answer : Option C
Explaination / Solution:
Fevicol is a synthetic sticky substance insoluble in water and used for joining wood and paper is a type of resins.
Q4. During protein synthesis, AUG functions as the initiator codon in mRNA. What should be the anticodon on the t-RNA molecule that picks up and brings the amino acid specified by this codon?
Answer : Option A
Explaination / Solution:
The anticodon on the t-RNA corresponding to AUG initiator codon on mRNA is UAC as A bonds with U and G bonds with C in RNA. Thymine (T) is absent in RNA.
Q5. How many sperms are formed by 4 primary spermatocytes?
Answer : Option A
Explaination / Solution:
Each primary spermatocyte undergoes first meiotic division to produce 2 secondary spermatocytes, which further proceeds to second meiotic division to form 2 spermatids. So, each primary spermatocyte produces 4 sperms.
Q6. Deforestation generally decreases
Answer : Option D
Explaination / Solution:
Deforestation generally decreases rainfall. Plants release water in form of water vapour in the process of transpiration. The water vapour contribute in cloud formation to bring rains.
Q7. Plant mitosis is generally controlled by
Answer : Option D
Explaination / Solution:
In plant cell, mitosis cell division is generally controlled by cytokinin hormone. It increase the rate of cell division leading to increased cell production. Auxinis also required for cell division in plant.
Q8. Which of the following is an example of genetic variation?
Answer : Option B
Explaination / Solution:
Genetic variation is the difference in the offspring of same parents produce sexually. The children of same parents having different eye colour is an example of genetic variation. Age, scar and eating habits are not genetic variation.
Q9. Carolus Linnaeus is associated with
Answer : Option D
Explaination / Solution:
Carolus Linnaeus is associated with Binomial nomenclature in which name of the organism consists of genus name and species name.
Q10. Which one is not a side effect due to regular use of contraceptive methods
Answer : Option C
Explaination / Solution:
Regular use of contraceptive methods may cause some side effects such as abdominal pain, breast cancer and nausea. AIDS is a viral disease caused by HIV and not a side effect of contraceptive method.
