Zoology - Online Test
Q1. DNA differ from RNA in having
Answer : Option A
Explaination / Solution:
DNA differ from RNA in having Thymine. Thymine is absent in RNA. RNA contain uracil in place of thymine.
Q2. Bacterial leaf blight of rice is caused by a species of
Answer : Option A
Explaination / Solution:
Bacterial leaf blight of rice is caused by bacterium Xanthomonas. The bacteria reduce the photosynthetic area of leaf and finally yield of rice is affected considerably.
Q3.
Match the following:
Animal
a) Paramecium
b) Pila
c) Scypha
d) Pheretima
circulation method
i) water canal system
ii) cyclosis
iii) blood flowing through vessels
iv) blood passing through sinuses
Answer : Option D
Explaination / Solution:
In Paramecium oxygen is carried by cyclosis, in Pila blood passing through sinuses carries oxygen, in Scypha water canal system is present and in Pheretima (earthworm) respiration is carried by blood flowing through vessels.
Q4. Earth is protected from ultra-violet radiations by means of
Answer : Option C
Explaination / Solution:
Ozone layer (stratospheric ozone) is a high concentration of ozone molecules about 30 to 50 km altitude (stratosphere). The main function of the ozone layer is to absorb the Sun's ultraviolet radiation, hence protecting the Earth from its harmful effects.
Q5. A cell divides every minute. It will fill a 100 ml beaker in one hour. How much time would it take to fill 50 ml beaker.
Answer : Option B
Explaination / Solution:
If a cell divide every minute, the number of cells get doubled at the end of each minutes. If a 100 ml beaker is filled in one hour, it will take 59 minute to fill 50 ml beaker.
Q6. Transfer of DNA into bacteria by phage is called as
Answer : Option C
Explaination / Solution:
Transfer of DNA into bacterial cell by phage or virus is called transformation. Phage kills the bacterium so called bacteriophage.
Q7.
Match the following :
Animal
a) Dugesia
b) Palaemon
c) Palamnaeus
d) Sea anemone
Excretory organ
i) body surface
ii) malpighian tubules
iii)protonephridia
iv) green glands
Answer : Option C
Explaination / Solution:
Excretory system of Dugesia is protonephridia, Palaemon is body surface, Palamnaeus is malpighian tubules and that of Sea anemone is body surface.
Q8. Select the correct statement from the following:
Answer : Option B
Explaination / Solution:
In organic evolution, fitness is the end result of the ability to adapt and gets selected by nature. Darwinian variations are small and directional. Mutation is sudden change in gene and all mammals have vertebrae.
Q9. Scientific study of diversity of organism and their evolutionary relationship is called
Answer : Option D
Explaination / Solution:
Systematics is the scientific study of diversity of organism and their evolutionary relationship. Systematics is also known as taxonomy. It includes identification, nomenclature and classification.
Q10. Which of the following may cause algal blooms in the aquatic system:
Answer : Option C
Explaination / Solution:
Algal bloom is rapid increase in population of algae is a water system. This is caused due to excess of nutrients like phosphorus and nitrogen in the water bodies.
