Biology - Online Test
Q1. Double helix model of DNA was proposed by proposed by
Answer : Option C
Explaination / Solution:
Double helix model of DNA was proposed by James Watson and Francis Crick in 1953 based on X-ray diffraction data produced by Maurice Wilkins and Rosalind Franklin.
Q2.
What does the chart given below represent?
Answer : Option D
Explaination / Solution:
The chart given below represent XX-XO type of sex determination in which XX forms the female and XO develops as male. It is common in birds.
Q3. Which kingdoms among the living organism contain only micro-organisms?
Answer : Option C
Explaination / Solution:
Monera and Protista contain only micro-organisms. Monera contains unicellular prokaryotic organisms like bacteria. Protista contains unicellular eukaryotic organisms.
Q4. Ozone depletion shall cause higher incidence of
Answer : Option D
Explaination / Solution:
The depletion of ozone layer allows entering of UV rays from sun into the earth’s atmosphere which is associated with a number of health related and environmental issues.
Skin Cancer: exposure to UV rays from sun can lead to increased risk for developing of several types of skin cancers. Malignant melanoma, basal and squamous cell carcinoma are the most common cancers caused by exposure to UV rays.
Eye Damage: UV rays are harmful for our eyes too. Direct exposure to UV rays can lead to Cataract problems, and also Photokeratitis or snow blindness.
Damage to Immune system: our immune system is also highly vulnerable to UV rays. Increased exposure to UV rays can lead to weakening of the response of immune system and even impairment of the immune system in extreme cases.
Q5. During anaerobic respiration less energy is produced than aerobic respiration because
Answer : Option A
Explaination / Solution:
During anaerobic respiration, incomplete oxidation of glucose takes place but during aerobic respiration complete oxidation of glucose occurs in which less energy is produced.
Q6. A plant X has 2n= 8 chromosomes, how many chromosomes are present in daughter cells after meiosis II.
Answer : Option C
Explaination / Solution:
The number of chromosome reduces to half at the end of meiosis cell division. If plant has 2n= 8 chromosome the number of chromosomes present in daughter cells after meiosis II is 4 only.
Q7. The smallest bands in the agarose gel will be towards
Answer : Option C
Explaination / Solution:
The smallest segment of DNA in the agrose gel will be towards anode or positively charged ends. The DNA fragments are negatively charged and moves towards negatively charged anode.
Q8. Why, according to our reading, did Darwin take so long to publish the Origin of Species?
Answer : Option C
Explaination / Solution:
Charles Darwin knew that once he announced his findings, he would become the center of a debate between religion and science. He knew he would shake everything that people had believed for so long. Darwin waited 20 years to present his work to the public.
Q9. Full form of ICBN is
Answer : Option B
Explaination / Solution:
ICBN stands for International code of botanical nomenclature that frames rules for nomenclature of plants applicable for all over the world.
Q10. Vascular bundles in which cambium is present between xylem and phloem is called as
Answer : Option A
Explaination / Solution:
Vascular bundles in which cambium is present between xylem and phloem is called open vascular bundles and those in which cambium is absent is called closed vascular bundles.
