Zoology - Online Test
Q1. The aquatic organisms that can actively swim at will against the water current is
Answer : Option D
Explaination / Solution:
Necton is an aquatic organism that can actively swim at will against the water current. Benthos and planktons float with water current and not against the water current.
Q2. Which pair is similar
Answer : Option C
Explaination / Solution:
Graafian follicle changes into corpus leteum as egg is released from it during ovulation. Corpus leteum release hormone called androgen.
Q3. Nicotinamide can be synthesised in human body from
Answer : Option A
Explaination / Solution:
Tryptophan is an amino acid needed for normal growth in infants and for nitrogen balance in adults. Nicotinamidecan be synthesized in human body from tryptophan.
Q4. When blood clot starts contracting, a pale yellow fluid starts oozing out. Its name and composition is :
Answer : Option D
Explaination / Solution:
Plasma without the clotting factors is called serum. The clotting factors include fibrinogen and blood corpuscles.
Q5. The amount of oxygen that would be consumed if all the organic matter in one liter of water were oxidized by bacteria is called
Answer : Option D
Explaination / Solution:
Biological Oxygen Demand is the amount of oxygen that would be consumed if all the organic matter in one liter of water are oxidized by bacteria. it is used as indicator of water pollution. More the value of BOD higher the water polluted.
Q6. That species which is found in highest concentration within a polluted water reservoir is called :
Answer : Option A
Explaination / Solution:
A number of organisms grow in polluted water. The species whose concentration is highest in polluted water is celled as index species as this species indicate the presence of particular kinds of pollutant in water.
Q7. The stage of inactivation of cell cycle due to non-availability of mitogens and energy rich compounds is called
Answer : Option B
Explaination / Solution:
It is the stage of cell cycle during which the cells remain metabolically active and do not divide due to absence of mitogens and energy producing compounds.
Q8. Restriction enzymes belongs to a larger class of enzymes called
Answer : Option B
Explaination / Solution:
A restriction enzyme (or restriction endonucleases) recognizes a specific base pair sequence in DNA called a restriction site and cleaves the DNA (hydrolyses the phosphodiester backbones) within the sequence. Restriction enzymes are widely found in prokaryotes and provide protection to the host cell by destroying foreign DNA that makes entry to it. It acts as a part of defense mechanism.
Restriction enzymes belong to a larger class of enzymes called nucleases. They are of two types: endonucleases and exonucleases.
Q9. Label the following in diagram
Answer : Option B
Explaination / Solution:
The diagram shown above is Malpighian body or renal corpuscles. The marked part in this is called Podocytes or visceral epithelial cells in Bowman’s capsule in the kidney that warp around capillaries of the glomerules.
Q10. The experiment to show the production of mice in 21 days from a dirty shirt placed in Contact with kernels of wheat was carried out by ______.
Answer : Option C
Explaination / Solution:
The first experiments to prove the spontaneous generation theory were done in the XVII century and a doctor called Jean Baptiste Van Helmont declared he had performed a unique experiment: he placed a dirty shirt together with some wheat and according to him, mice were born 21 days later.
According to the Doctor the sweat in the shirt was the active element which gave life to the inert matter.
