Zoology - Online Test
Q1. Where (a) is a neutrophil, identify the other four WBCs?
Answer : Option C
Explaination / Solution:
There are two main categories of WBCs – granulocytes and agranulocytes. Neutrophils, eosinophils and basophils are different types of granulocytes, while lymphocytes and monocytes are the agranulocytes.
Q2. The puffed-up appearance of dough is due to production of
Answer : Option B
Explaination / Solution:
The puffed-up appearance of dough is due to production of gas. Baking soda (sodium hydrogen carbonate) on heating release carbon dioxide gas along with sodium carbonate.
Q3. Term acid rain was coined for the first time by
Answer : Option A
Explaination / Solution:
Robert August Smith was a Scottish chemist, who investigated numerous environmental issues. He is known for his research on air pollution in 1852, in the course of which he discovered what came to be known as acid rain. He is sometimes referred to as the 'Father of Acid Rain'.
Acid rain occurs due to presence of Sulphur dioxide and nitrogen oxide in atmosphere.
Q4. The number of chromosome and the amount of DNA are changed in
Answer : Option A
Explaination / Solution:
S phase marks the period during which DNA synthesis or replication takes place. During this time the amount of DNA per cell doubles. If the initial amount of DNA is denoted as 2C then it increases to 4C.and even in anaphase the chromosome numbers are changed.1
Q5. Host cell membrane can be made permeable by
Answer : Option B
Explaination / Solution:
CaCl2 can be used to make the bacterial cell a permeable cell, and by introducing these cells (after CaCl2 being placed into the mixture of bacterial cells), a plasmid for ampicillin resistance can be transformed into the bacteria. The standard method for making the bacteria permeable to DNA involves treatment with calcium ions.
Q6. Homeostasis in the body is largely maintained by :
Answer : Option A
Explaination / Solution:
Homeostasis is the maintenance of constant body temperature. It is mainly maintained by excretion and osmoregulation, which is the function of kidney.
Q7. According to abiogenesis life originates from
Answer : Option A
Explaination / Solution:
According to abiogenesis theory of origin of life, life originated from non-living matter like gases, inorganic substance and water at particular temperature and pressure.
Q8. The expansion of ICZN is
Answer : Option D
Explaination / Solution:
Animal taxonomists have evolved International Code of Zoological Nomenclature (ICZN). Hence, the correct option is International code of zoological nomenclature.
Q9. The correct organisation of skeletal muscle is
Answer : Option B
Explaination / Solution:
Each organised skeletal muscle in our body is made of a number of muscle bundles or fascicles held together by a common collagenous connective tissue layer called fascia. Each muscle bundle contains a number of muscle fibres. A characteristic feature of the muscle fibre is the presence of a large number of parallelly arranged filaments in the sarcoplasm called myofilaments or myofibrils. The portion of the myofibril between two successive ‘Z’ lines is considered as the functional unit of contraction and is called a sarcomere.
Q10. Bt toxin is obtained from
Answer : Option A
Explaination / Solution:
Bt toxin is obtained from Bacillus thuringiensis bacterium that can kill certain insects like tobacco budworm, armyworm, beetles and flies.
