Biology - Online Test
Q1. When we compare the relationship between species richness and area for wide variety of taxa, the graph appears to be a :
Answer : Option A
Explaination / Solution:
Explanation:
- 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
Q2. The cross-section of the body of an invertebrate is given below. Identify the animal which has this body plan.
Answer : Option D
Explaination / Solution:
In some animals, the body cavity is not lined by mesoderm, instead, the mesoderm is present as scattered pouches in between the ectoderm and endoderm. Such a body cavity is called pseudocoelom and the animals possessing them are called pseudocoelomates, e.g.,aschelminthes such as round worm.
Q3. Which of the following plant contain unisexual flower
Answer : Option A
Explaination / Solution:
The flower which contains either male or female reproductive part is called unisexual flower. Papaya plant produce either male or female flower in separate plants.
Q4. Head of epididymis is called as
Answer : Option D
Explaination / Solution:
Epididymis is a long narrow coiled tube attached to the surface of the testis in mammals and reptiles. It acts as temporary storage organ of spermatozoa received from seminiferous tubules. The head of it is called caput epididymis.
Q5. Select the group of fat soluble vitamins from the followings
Answer : Option C
Explaination / Solution:
Vitamins A, D, E and K are fat soluble but insoluble in water. Vitamin B and C are water soluble vitamins.
Q6. Rh incompatibility develops when :
Answer : Option C
Explaination / Solution:
A special case of Rh incompatibility (mismatching) has been observed between the Rh-ve blood of a pregnant mother with Rh+ve blood of the foetus.
Q7. Who is regarded as the father of genetics?
Answer : Option A
Explaination / Solution:
Mendel is regarded as the father of genetics due to his initial law of inheritance given by him on the basis of Hybridisation conducted by him on garden pea.
Q8. Pasture effect can be studied in case of
Answer : Option C
Explaination / Solution:
Reduction in consumption of respiratory substrate when the mode of respiration is changed from aerobic to anaerobic is called pasture effect. It is studied in case of Sccharmomyces.
Q9. Which of the following bacterium produces butyric acid?
Answer : Option A
Explaination / Solution:
Clostridium butylicum is used to produce butyric acid. Butyric acid is important industrial chemicals used to process food items.
Q10. In normal adults, the enzyme which catalyses conversion of MHb into Hb is :
Answer : Option C
Explaination / Solution:
Methemoglobin cannot bind oxygen, unlike oxyhemoglobin. It is bluish chocolate-brown in color.
In human blood a trace amount of methemoglobin is normally produced spontaneously, but when present in excess the blood becomes abnormally dark bluish brown.
The NADH-dependent enzyme methemoglobin reductase (MHbreductase enzyme) is responsible for converting methemoglobin back to hemoglobin. . MHb is inactive forms that is converted into Hb that carries oxygen in blood.
