Biology - Online Test
Q1. 70% of carbondioxide is transported as bicarbonate by the enzyme
Answer : Option A
Explaination / Solution:
An enzyme present in red blood cells, carbonic anhydrase, aids in the conversion of carbon dioxide to carbonic acid and bicarbonate ions. When red blood cells reach the lungs, the same enzyme helps to convert the bicarbonate ions back to carbon dioxide, which we breathe out. It transportes nearly 70% of carbondioxide as bicarbonate.
Q2. The maintenance of hives of honeybees for the production of honey is
Answer : Option C
Explaination / Solution:
Maintenance of bee hives of honey bees for production of honey is called apiculture. Apiculture can be practiced in any area having pasture of herbs and flowering plants.
Q3. Diversity can be promoted by:
Answer : Option C
Explaination / Solution:
The species that predominates in an ecological community, particularly when they are most numerous or form the bulk of the biomass.
Diversity can be promoted by dominant species. Dominant species of an ecosystem determine the way of diversity which may be linear or diverse.
Q4. A person accidentally got his adrenal gland injured. He died & reports will probably reveal that death was caused due to :
Answer : Option B
Explaination / Solution:
Adrenal cortex is situated along the perimeter of the adrenal gland. The adrenal cortex mediates the stress response through production of aldosterone and cortisol. If a person got injured his adrenal gland may die due to loss of stress response which will be reveled in report.
Q5. Which phylum has comb plates for locomotion as their distinctive feature?
Answer : Option B
Explaination / Solution:
The body of phylum Ctenophora bears eight external rows of ciliated comb plates, which help in locomotion
Q6. Primary germ layers are
Answer : Option A
Explaination / Solution:
Development of fetus start from zygote divisions to form embryo. The embryo undergoes multiple divisions to form blastocysts that arrange into layers. The primary layers are ectoderm, mesoderm and endoderm.
Q7. Which of the following carries the hereditary information from parents to progeny?
Answer : Option C
Explaination / Solution:
Nucleic acids carry hereditary information and are passed on from parental generation to progeny.
Q8. Whose karyotype is represented below?
Answer : Option B
Explaination / Solution:
Karyotype is the representation of chromosome in order of shape and size. Male Drosophila fly have 3 pairs of autosomes and 1 pair (XY) sex chromosome.
Q9. Organism like Escherichia coli and Chlamydia trachomatis fall into which domain?
Answer : Option D
Explaination / Solution:
Escherichia coli and Chlamydia trachomatis fall into which Bacteria family. Bacteria can live in all kind of environment like air, water and soil including inside the body of plants and animals as parasite.
Q10.
Match the following:
column A
a) Atherosclerosis
b) Haemorrhage
c) Heparin
d) Polycythemia
column B
i) Hypotension
ii) High blood pressure
iii) Abnormal increase in RBC count
iv) Anticoagulant
Answer : Option B
Explaination / Solution:
Antherosclerosis leads to high blood pressure, haemorrhage causes hypotension, heparin is used as anticoagulant and polycythemia causes abnormal increase in RBC count.
