Biology - Online Test
Q1. Virus that kills bacteria are called
Answer : Option C
Explaination / Solution:
Bacteria eating virus are called Bacteriophage. Bacteriophage attach with body of bacteria and genetic material is transferred to bacteria where lot of bacteriophage are produced.
Q2. Sarla is on protein-deficient diet. As a result her plasma proteins content is reduced. She may develop symptom like :
Answer : Option B
Explaination / Solution:
Consuming protein deficient diet for longer duration may results into reduction in protein plasma reduction. The symptoms that appear on body includes swelling of hands and feet.
Q3. As per U.S. greenhouse gas emissions report which of the following accounted for the second largest percentage of greenhouse gases?
Answer : Option C
Explaination / Solution:
According to U.S. greenhouse gas emissions report methane (CH4CH4) accounted of the second largest percentage of greenhouse gases after Chlorofluorocarbon (CFCs).
Q4. Two Synonyms are
Answer : Option C
Explaination / Solution:
Tricarboxylic acid cycle and citric acid cycle are two synonyms as both represent same cycle occurring during respiration process.
Q5. Diplotene stage can lasts for months or years. Dinoflagellates possess condensed chromosomes even in interphase, their nucleus is called
Answer : Option B
Explaination / Solution:
In oocytes of some vertebrates, diplotene can last for months or years.Such nucleus showing arrested diplotene stage is called mesokaryotic nucleus.
Q6. Stanley Cohen and Herbert Boyer worked on which bacteria?
Answer : Option D
Explaination / Solution:
Stanley Cohen and Herbert Boyer worked on bacterium Salmonella typhimuriumin 1972 by isolating the antibiotic resistance gene by cutting out a piece of DNA from a plasmid which was responsible for conferring antibiotic resistance.
Q7. Match the kidney disorders and its symptoms :
column A
a) Ketosis
b) Polydipsia
c) Alkaptonuria
d) Haematuria
column B
i) frequent thirst
ii) blood in urine
iii) acetoacetic acid in urine
iv) homogentisic acid in urine
column A
a) Ketosis
b) Polydipsia
c) Alkaptonuria
d) Haematuria
column B
i) frequent thirst
ii) blood in urine
iii) acetoacetic acid in urine
iv) homogentisic acid in urine
Answer : Option C
Explaination / Solution:
Ketosis is the presence of actoacetic acid in urine, polydipsia is the condition of frequent thrist, alkaptonuria is the presence of homogentisic acid in urine and haematuria is the presence of blood in urine.
Q8. According to Neo-Darwinism, natural selection operates through
Answer : Option C
Explaination / Solution:
According to Neo-Darwinism, natural selection operates through differential reproduction. During sexual reproduction gametes are formed by meiosis division in which crossing over brings about change in traits that leads to variation for natural selection.
Q9. Which is the scientific name for wheat?
Answer : Option B
Explaination / Solution:
Wheat is a grass widely cultivated for its seed, a cereal grain which is a worldwide staple food.
There are many species of wheat which together make up the genus Triticum; the most widely grown is common wheat (T. aestivum).
Q10. Guard cells of stomata are thicker
Answer : Option C
Explaination / Solution:
The cells surrounding the stomata are called guard cells. The guard cells of inner side are thicker and that of outer side is comparatively thinner.
