Zoology - Online Test
Q1. The correct sequence of lipid digestion in alimentary canal is :
Answer : Option A
Explaination / Solution:
Digestion of (lipid) fat begins in small intestine by secretion of bile juice that contains bile salts. Bile salt emulsify the lipids into globules that is further simplified into micelles and chylomicrons.
Q2. Cancer cells can be easily be destroyed by radiations due to
Answer : Option A
Explaination / Solution:
Radiation therapy targets the DNA inside the cell by making them unable to divide and reproduce. Cancer cells perform unlimited cell division. Now, when their dividing ability is targeted, naturally they respond more. Newly formed cells can be easily destroyed by radiation of high frequency. They stop dividing. Thus, the tumour shrinks.
However, the adjoining normal cells also get affected by radiation but they can repair themselves more effectively.
Q3. In the prosencephalon, first and second ventricles open into third ventricle by :
Answer : Option B
Explaination / Solution:
In prosencephlon, the first and second ventricles open into third ventricles by foramen of Monro. It is the opening that connects the left and right sides of lateral ventricle in brain.
Q4. The inner membrane of mitochondria thrown into folds to form finger like structure is called
Answer : Option B
Explaination / Solution:
Mitochondria are double membranous structure. The inner membrane of mitochondria thrown into folds to form finger-like structureis called cristae.
Q5. Which one of the following is not a part of a transcription unit in DNA?
Answer : Option A
Explaination / Solution:
Transcription is the process by which the information in a strand of DNA is copied into a new molecule of messenger RNA (mRNA).
Transcription of DNA requires a promoter, the structural gene to be transcripted and a terminator. The inducer is not required during transcription of DNA.
Q6. The exchange of gases in :
i. the alveoli that lowers the of blood and raises its is external respiration
ii. the tissues that lowers the of blood and raises its is internal respiration
i. the alveoli that lowers the of blood and raises its is external respiration
ii. the tissues that lowers the of blood and raises its is internal respiration
Answer : Option D
Explaination / Solution:
In the alveoli, there is high , low , lesser H+ concentration and lower temperature,
Q7. Tissue culture technique was first performed successfully by
Answer : Option B
Explaination / Solution:
plant tissue culture is the technique of in vitro maintaining and growing cells, tissue or organs in nutrient medium. Tissue culture technique was first performed successfully by White in 1932.
Q8. How many species in the world are facing threat of extinction?
Answer : Option B
Explaination / Solution:
Nearly 700 species have become extinctin recent times and more than 15,500 species (of which > 650 are from India) which includes amphibians, gymnosperms, reptiles, birds and mammals etc. currently face the threat of extinction.
The causes of high extinction rates at present include habitat (particularly forests) lossand fragmentation, over-exploitation, biological invasions andco-extinctions.
Q9. Which of the following is not matched correctly :
Answer : Option A
Explaination / Solution:
Adrenal cortex is mesodermal in origin. Adrenal medulla is derived from ectoderm, gonads is derived from mesoderm and thyroid and parathyroidis derived ectoderm.
Q10. Which phylum has balance organs?
Answer : Option A
Explaination / Solution:
Sensory organs like antennae, eyes(compound and simple), statocysts or balance organs are present in phylum Arthropoda.
