Biology - Online Test
Q1.
Statement I: DNA finger printing is highly reliable method of identification of individual involved in crimes.
Statement II: DNA a fingerprinting is a sure method in solving paternity and maternity disputes.
Statement III: DNA fingerprinting can be used to cure HIV infection.
Answer : Option C
Explaination / Solution:
DNA finger printing is highly reliable method of identification of individual involved in crimes. DNA a fingerprinting is a sure method in solving paternity and maternity disputes.DNA fingerprinting cannot be used to cure HIV infection.
Q2. Parturition occurs due to release of hormone oxytocin that cause
Answer : Option C
Explaination / Solution:
Oxytocin hormone is released by foetal ejection reflex from maternal pituitary gland that causes stronger and stronger uterine contraction that leads to ejection of baby through birth canal.
Q3. Human settlement started around 10, 000 years ago due to starting of
Answer : Option D
Explaination / Solution:
Agriculture came around 10,000 years back and human settlements started. After starting of agriculture, the human civilization started the grows and decline many times.
Q4. The hybridization of probes having radioactive isotopes with various sequence of nitrogen bases with ssVNTR is called
Answer : Option C
Explaination / Solution:
A Southern blot is a method used in molecular biology for detection of a specific DNA sequence in DNA samples. Southern blotting combines transfer of electrophoresis-separated DNA fragments to a filter membrane and subsequent fragment detection by probe hybridization.
Q5. Statement I: During growth of embryo limbs and external genital organ is formed by the ends of 12 weeks.
Statement II: The sex of the developing embryo can be determined using ultrosonography after 3 months of pregnancy.
Statement II: The sex of the developing embryo can be determined using ultrosonography after 3 months of pregnancy.
Answer : Option D
Explaination / Solution:
During growth of embryo limbs and external genital organs is formed by the ends of 12 weeks (3 months). Ultrosonography can be used to know the sex of foetus after this period as genital organs are formed.
Q6. Common origin of man and chimpanzee is best shown by
Answer : Option D
Explaination / Solution:
Common origin of man and chimpanzee is best shown by chromosomes. Both human beings and chimpanzee shows similar kinds of chromosome in terms of number and size.
Q7.
Assertion: VNTR of two persons may be similar at certain sites but could be different at other sites.
Reason: A child inherits 50% of chromosomes from mother and remaining 50% from father.
Answer : Option C
Explaination / Solution:
VNTR of two persons may be similar at certain sites but could be different at other sites because a child inherits 50% of chromosomes from mother and remaining 50% from father. VNTR genes also undergoes different kinds of mutations.
Q8. Assertion: Just after implantation, embryo (inner cell mass) differentiates into ectoderm, mesoderm and endoderm.
Reason: These three layers give rise to all tissues and organs in adult human beings.
Answer : Option A
Explaination / Solution:
After implantation, embryo differentiates into outer layer called ectoderm, middle layer mesoderm and inner layer endoderm. These three layers forms the all tissues or organs of human beings.
Q9. During replication of DNA, Okazaki fragments are formed in the direction of :
Answer : Option B
Explaination / Solution:
During replication of double helix DNA, one strands having 3’ to 5’ polarity it is continuous and on other strand it is in small fraction called Okazaki fragments. The polarity of this strand is 5’ to 3’.
Q10. The process of delivery of the foetus is called
Answer : Option B
Explaination / Solution:
The process of delivery of fully developed foetus at the end of pregnancy period is called Parturition. The middle wall of uterus undergoes rigorous contraction to release baby through birth canal.
