Zoology - Online Test
Q1. Speed of decomposition will be
Answer : Option B
Explaination / Solution:
In detritus food chain, speed of decomposition will be fast if detritus is rich in simple sugar that can be easily decomposed into glucose by saprophytes that includes bacteria and fungi.
Q2. First step in the process of inspiration is :
Answer : Option A
Explaination / Solution:
Inspiration is the process of intake of oxygen from the surrounding. This is achieved by increasing the volume of thoracic cavity. Contraction of diaphragm relax the sternum that increae the thoracic cavity.
Q3. Heterosis means
Answer : Option D
Explaination / Solution:
Hybrid vigour is obtained from hybridization between two plants containing desired traits. Hybrid vigour is also called heterosis as it contains genes from different plants.
Q4. When we compare the relationship between species richness and area for wide variety of taxa, the graph appears to be a
Answer : Option B
Explaination / Solution:
- Alexander Von Humboldt has observed that within a region, species richness gets increased when explored area is increased, but only up to a limit.
- The relationship between species richness and area for a number of taxa like angiospermic plants, fresh water fishes and birds is found to be a rectangular hyperbola.
The equation is described by –
log S = log C + Z log A
S – Species Richness
Z – Slope of the line (regression coefficient)
A – Area
C – y-intercept
Q5. Shekhar is 3 years old and he lives in hilly areas. He has swollen neck :
i. He is suffering from goitre caused due to iodine deficiency which may lead to cretinism.
ii. Goitre may lead him to myxoedema and Grave’s disease in future.
i. He is suffering from goitre caused due to iodine deficiency which may lead to cretinism.
ii. Goitre may lead him to myxoedema and Grave’s disease in future.
Answer : Option B
Explaination / Solution:
The persons living in hilly areas generally suffer from goiter disease. Goiter is caused due to iodine deficiency which may leads to cretinism. Goiter never leads to myxedemaor hypothyroidism.
Q6. Animals which possess cleidoic egg exhibit
Answer : Option D
Explaination / Solution:
The cleidoic egg is the type of egg which reptiles and birds lays. These eggs exhibit internal fertilization and external development.
Q7. Which of the following is a primary sex organ of female?
Answer : Option A
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.
The secondary sex organs in a female are fallopian tubes, uterus, and vagina.
Q8. Arachidonic acid has
Answer : Option A
Explaination / Solution:
Arachidonic acid has 20 carbon atoms including the carboxyl carbon. Molecular formula- C20H32O2.
Q9. The layer of heart pericardium which checks its overstretching and overfilling as well as also protects heart from mechanical injury is :
Answer : Option C
Explaination / Solution:
Pericardium is protective covering of heart. Pericardium is made of different layers to perform different functions. The layer of heart pericardium which checks its overstretching and overfilling as well as protects heart from mechanical injury is fibrous pericardium.
Q10. Biogas is a
Answer : Option A
Explaination / Solution:
Anaerobic decomposition of biomass like cow dung release biogas. This biogas contains mainly methane gas and can be used as fuel for cooking and lighting.
