Zoology - Online Test
Q1. Tracheal tube divides into right and left bronchi at the level of :
Answer : Option A
Explaination / Solution:
Trachea divides at the level of 5th thoracic vertebra into a right and left primary bronchi.
Q2. Best method to increase crop yield is
Answer : Option D
Explaination / Solution:
Crop production can be increased by adopting a number of methods like using seeds of improved varieties, using modern method of agriculture, using fertilizers and pesticides. An improved seed variety is most important for better yield.
Q3. Speciation maintains biodiversity
Answer : Option C
Explaination / Solution:
Speciation, the formation of new and distinct species in the course of evolution. Speciation involves the splitting of a single evolutionary lineage into two or more genetically independent lineages.
Speciation maintains biodiversity both at species level and community level. New species develop from older species due to variation having more adaptive in changed habitat.
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Q4. Which phylum contain acoelomic and triploblastic animals?
Answer : Option C
Explaination / Solution:
Those animals in which the developing embryo has a three germinal layer, mesoderm in between the ectoderm and endoderm, are called triploblastic animals and absence of internal body cavity is called as acoelomic.
Q5. Which of the following is a primary sex organ of female?
Answer : Option C
Explaination / Solution:
Ovary is the primary sex organ of female reproductive system in human beings. Egg is released from one of the ovary each month. It also release hormone.
Q6. The number of substrate molecules changed per minute by a molecule of enzyme is called
Answer : Option C
Explaination / Solution:
The number of substrate molecules changed per minute by a molecule of enzyme is called turn over number. Higher the turn over number more effective is the enzyme.
Q7. Which of the following blood components play a major role in blood coagulation ?
Answer : Option A
Explaination / Solution:
Platelets also called thrombocytes are cell fragments produced from megakaryocytes. Platelets can release a variety of substances most of which are involved in the coagulation or clotting of blood.
Q8. Micro-organisms that grow in milk and convert it to curd is commonly called
Answer : Option A
Explaination / Solution:
The micro-organisms that grow in milk and convert it to curd is commonly called lactic acid bacteria. Micro-organism such as Lactobacillus and others commonly called as lactic acid bacteria (LAB).
Q9.
Air pollution is:
i. 5th leading cause of deaths in Indian sub-continent.
ii. ranked among top 10 killers in the world.
iii. 7th most dangerous killer in south Asia.
Answer : Option A
Explaination / Solution:
Air pollution causes a number of respiratory disease including lung cancer. It is the 5th leading causes of deaths in Indian sub-constinent and 7th most dangerous killer in south Asia.
Q10. Plants show mitotic divisions in -------------
Answer : Option C
Explaination / Solution:
The plants can show mitotic divisions in both haploid and diploid cells due to alternation of generations in life cycle.
