Biology - Online Test
Q1. Which ratio is constant for DNA
Answer : Option D
Explaination / Solution:
In DNA, adenine bind with thymine and guanine binds with cytosine. So, sum of adenine and guanine is equal to sum of thymine and cytosine.
Q2. Which of the following is not an ecological parameter:
Answer : Option D
Explaination / Solution:
ecological parameter is a variable, measurable property whose value is a determinant of the characteristics of an ecosystem.
Ecological parameter includes, biomass, energy and number of individual in the ecosystem. Stratification is not a part of ecological parameter because it can not be quantified.
Q3. Solarisation is
Answer : Option A
Explaination / Solution:
Solarisation is the inhibition of photosynthesis at very high light intensities due to photoxidation of certain compounds and destruction of chlorophyll moleucules.
Q4. Ram suffers punctures in his chest cavity without any damage to the lungs in an accident. It results in
Answer : Option D
Explaination / Solution:
haemopneumothorax, is a medical term describing the combination of two conditions: pneumothorax, or air in the chest cavity, and hemothorax (also called hæmothorax), or blood in the chest cavity. A hemothorax, pneumothorax or both can occur if the chest wall is punctured.
Becauseof punctured chest wall, the lungs cannot expand, the pressure in the lungs never drops and no air is pulled into the bronchi. Respiration is not possible.
Q5. Which of the following scientist’s name is not correctly matched with the theory by them?
Answer : Option C
Explaination / Solution:
The theory of inheritance of acquired traits is given by Weismann. Mendel gave the theories of inheritance that includes law of dominance, law of segregation and law of independent assortment.
Q6. If a sample area comprises of more number of taxonomically unrelated species, this will indicate
Answer : Option C
Explaination / Solution:
Richness is a measure of the number of different kinds of organisms present in a particular area.
A diverse sample area having more number of taxonomically unrelated species will indicate a more diverse sample area.
A sample area is used to know the diversity of a geographical area.
Q7. Animals of class Mammalia have
Answer : Option C
Explaination / Solution:
The animals of class Mammalia have seven cervical vertebra and four chambered heart. Mammalian are charecterised by presence of mammary gland to feed their young ones.
Q8. Pollen grains are formed inside the
Answer : Option D
Explaination / Solution:
Pollen grains are formed inside the anther. Stamen contains filament and anther. Inside the anther microsporogenesis process takes place to produce haploid pollen grains that forms male gametes.
Q9. The opening of vagina is often covered partially by a membrane called
Answer : Option B
Explaination / Solution:
Vagina is partially covered by a membrane called hymen. The hymen is generally torn during first coitus. It may be also broken due to active participation in sports like cycling and horse riding.
Q10. Metal ions required for functioning of enzyme is
Answer : Option D
Explaination / Solution:
A number of enzymes require metal ions for their activity which form coordination bonds with side chains at the active site and at the same time form one or more cordination bonds with the substrate, e.g., zinc is a cofactor for the proteolytic enzyme carboxypeptidase.
