Zoology - Online Test
Q1. The part which is common passage for both digestive and respiratory tracts :
Answer : Option A
Explaination / Solution:
In humans the pharynx is part of the digestive system and also of the conducting zone of the respiratory system. The oesophagus and the trachea (wind pipe) open into the pharynx.
Q2. The organism which causes pneumonia in human beings is
Answer : Option D
Explaination / Solution:
In human beings pneumonia is caused by bacterium Streptococcus pneumoniae that cause inflammation in lungs. This bacterium is atrichous as it lacks flagella of body surface.
Q3.
Match the following :
| Column A | Column B |
| a) Unipolar nerves | i) Nerve cells of retina |
| b) Mixed nerves | ii) Nerve cells of cerebral cortex |
| c) bipolar nerves | iii) Nerves of embryonic stage |
| d) Multipolar nerves | iv) All the spinal nerves |
Answer : Option A
Explaination / Solution:
Unipolar nerves are present in nerves of embryonic stage. Mixed nerves are found in all the spinal nerves. Bipolar nerves are present in nerve cells of retina. Multipolarnerves are present in nerve cells of cerebral cortex.
Q4. Animal cell do not possess
Answer : Option D
Explaination / Solution:
Animal cell do not possess plasmodesmata but it contain ribosomes, centriole andplamalemma. Plasmodesmata is the connection between two plant cells.
Q5. _____ occurs in RNA instead of the nitrogenous base thymine found in DNA.
Answer : Option B
Explaination / Solution:
Uracil is one of the four nucleobases in the nucleic acid of RNA that are represented by the letters A, G, C and U. The others are adenine, cytosine, and guanine. In RNA, uracil binds to adenine via two hydrogen bonds.
Q6. Which of the following ecological pyramid is always erect and upright :
Answer : Option B
Explaination / Solution:
The pyramid of energy is always erect in both terrestrial and aquatic ecosystems. It is so because the energy accumulated by producers by photosynthesis is not stored in their body totally as some part of the energy they produce is used to perform different activities. So the energy flow decreases from producers to top level of consumer.
Q7. The exposure of carbon monoxide to animals
Answer : Option C
Explaination / Solution:
The toxicity in animals is caused by the extraordinary affinity of carbon monoxide for haemoglobin which is responsible for the oxygen transport (approx. 250 times greater affinity of carbon monoxide compared to oxygen.because of higher affinity it destroys the haemoglobin.
Q8. Polyploidy is induced through
Answer : Option B
Explaination / Solution:
Polyploidy is a condition in which multiple sets of chromosome is present in same cell in place of usual two sets (diploid). Cell division involves karyokinesis followed by cytokinesis. Colchicine prevents the cytokinesis that results the more than two sets of chromosome.
Q9. If all the members of a host species die then all its unique parasites also die off, representing:
Answer : Option C
Explaination / Solution:
Coextinction and cothreatened refer to the phenomena of the loss or decline of a host species resulting in the loss or endangerment of other species that depend on it, potentially leading to cascading effects across trophic levels.
Q10. Egg of reptiles and birds are
Answer : Option A
Explaination / Solution:
The eggs of reptiles and birds are polyecithal because they contain large amount of yolk inside the egg.
