Zoology - Online Test
Q1. Which possess acellular structure?
Answer : Option A
Explaination / Solution:
A bacteriophage is a virus that infects and replicates within a bacterium.
Except bacteriophage, all possess cellular structure.
Q2. Unit of evolution and ecology is
Answer : Option B
Explaination / Solution:
The unit of evolution and ecology is population. Evolution occurs due to change in genome of individual that affects the whole population. Ecology is the study of population along with their variation in ecosystem.
Q3.
Match the following:
| Digestive Disorder | Cause |
| a) Constipation | i) gallstones |
| b) Jaundice | ii) reflex actionanxiety |
| c) Indigestion | iii) intentinal ischemia |
| d) Vomiting | iv) irregular bowel movements |
Answer : Option D
Explaination / Solution:
The causes of indigestion are inadequate enzyme secretion, anxiety, food poisoning, over eating, and spicy food. In constipation, the bowel movements occur irregularly. In jaundice, deposition of bile pigments result in gall stones. A reflex action is controlled by the vomit centre in the medulla.
Q4. Assertion: Mast cells in the human body release excessive amounts of inflammatory chemicals, which cause allergic reactions.
Reason: Allergens in the environment on reaching human body stimulate mast cells in certain individuals.
Reason: Allergens in the environment on reaching human body stimulate mast cells in certain individuals.
Answer : Option C
Explaination / Solution:
The IgE-primed mast cell releases granules and powerful chemical mediators, such as histamine, cytokines, granulocyte macrophage colony-stimulating factor (GM-CSF), leukotrienes, heparin, and many proteases into the environment. These chemical mediators cause the characteristic symptoms of allergy.
Q5. The organelle involved in respiration is
Answer : Option A
Explaination / Solution:
Mitochondria are the sites of aerobic respiration. They produce cellular energy in the form of ATP
Q6. Which one represents the correct manner of DNA replication?
Answer : Option A
Explaination / Solution:
During replication of DNA, in one strand (3’ to 5’) replication takes place continuously and in other strand it is in small segment and joined together by DNA ligase enzyme.
Q7. Lysine rich Maize variety is
Answer : Option C
Explaination / Solution:
Lysine is a type of amino acids present in the proteins. Maize variety Shakti is rich in lysine amino acids.
Q8. Cleanliness observed by human beings will adversely affect the habitats of:
Answer : Option D
Explaination / Solution:
Scavenger feeds on dead animal and plant material present in the habitat. Cleanliness observed by human beings will adversely affect the habitat of the scavengers.
Q9. Which among the following is a gregarious pest?
Answer : Option C
Explaination / Solution:
Locust (Locusta) is a gregarious pest belonging to phylum Arthropoda.
Q10. Division of human egg is
Answer : Option C
Explaination / Solution:
Meroblastic is the type of incomplete cleavage that occurs in very yolky eggs, in which the egg cytoplasm but not the yolk divides.
