Zoology - Online Test
Q1. The maximum growth rate occur in
Answer : Option A
Explaination / Solution:
Maximum growth of individuals occurs during exponential phase of growth. This phase is followed by stationary phase of growth.
Q2. The junctions which help to stop substances from leaking across a tissue is
Answer : Option A
Explaination / Solution:
Tight junctions hold cells together. They are narrow belts that circle around the upper part of lateral surfaces of the adjacent epithelial cells to create a fusion point. They stop substances from leaking across a tissue as they prevent passage of molecules and ions through space between adjacent cells.
Q3. Which one is not a characteristic feature of prokaryotes?
Answer : Option D
Explaination / Solution:
Prokaryotic organisms generally do not reproduce by sexual reproduction in favorable conditions. The most common method of reproduction is asexual.
Q4. Read the following :
i. Major pineal hormone is melatonin.
ii. In human beings, melatonin secretion increases in light and decreases in dark.
iii. Abnormally high levels of melatonin in children causes delayed sexual development.
Answer : Option A
Explaination / Solution:
Melatonin is a hormone secreted by the pineal gland in the brain. In helps regulate other hormones and maintains the body circadian rhythm. Abnormally high levels of melatonin is children causes delayed sexual development.
Q5. Match the following:
column I
(i) Migrate
(ii) Suspend
(iii) Regulate
(iv) Conform
Column II
(a) hibernation and aestivation
(b) sweat it out
(c) inability to maintain a constant internal environment
(d) people going from Rajasthan to Kashmir during summer
(i) Migrate
(ii) Suspend
(iii) Regulate
(iv) Conform
Column II
(a) hibernation and aestivation
(b) sweat it out
(c) inability to maintain a constant internal environment
(d) people going from Rajasthan to Kashmir during summer
Answer : Option D
Explaination / Solution:
People going from Rajasthan to Kashmir during summer is a kind of migration. During hibernation and aestivation organism suspends life proceeses to minimum levels. To regulate the body temperature sweating occurs and inability to maintain consistent internal environment is called conformation.
Q6.
Match the following:
| Nutrient | Absorbable Forms |
| a) Carbohydrate | i) Amino acids |
| b) Nucleic acid | ii) Monosaccharides |
| c) Proteins | iii) Sugar and bases |
| d) Lipids | iv) Fatty acids and glycerol |
Answer : Option B
Explaination / Solution:
Carbohydrate are converted into monosaccharides, nucleic acid are converted into sugar and bases by nucleosidases, proteins are converted into amino acids by dipeptidases and lipids are converted into fatty acids and glycerol by lipases.
Q7. Antibodies in our body are complex
Answer : Option B
Explaination / Solution:
Antibodies in our body are present in the blood in form of glycoproteins. They produce antigens in response to foreign particles to provide immunity against the pathogen.
Q8. Vermis is a portion of :
Answer : Option B
Explaination / Solution:
Cerebral vermis is located in the medial, cortico-nuclear zone of the cerebellum. It is constricted between lobe of cerebellum.
Q9. The rod shaped bacteria is called as
Answer : Option B
Explaination / Solution:
The shapes of bacteria are bacillus (rod like), coccus (spherical), vibrio (comma shaped) and spirillum (spiral).
Q10. DNA has equal number of adenine and thymine residues (A = T) and equal number of guanine and cytosine (G = C). These relationships are known as
Answer : Option A
Explaination / Solution:
Chargaff's rules states that DNA from any cell of all organisms should have a 1:1 ratio (base Pair Rule) of pyrimidine and purine bases and, more specifically, that the amount of guanine is equal to cytosine and the amount of adenine is equal to thymine.
