Biology - Online Test
Q1. You forget to add Cytokinin the culture medium, there will be very little growth as Cytokinin is essential for
Answer : Option D
Explaination / Solution:
Cytokinin is added to culture medium to induce cell division and cell differentiation. If cytokine is not added to culture medium, there will be very little growth in culture.
Q2. Preventive birth control measure is
Answer : Option B
Explaination / Solution:
Preventive birth control measure is preventing sperms from entering the uterus. It includes periodic absentee, coitus interrupts etc.
Q3. The winter sleep in frog is called
Answer : Option C
Explaination / Solution:
During extreme heat and cold period, frog takes shelter in deep burrows to protect them from extreme environmental conditions. This is called as summer sleep (aestivation) and winter sleep (hibernation).
Q4. Genetic material for retrovirus is
Answer : Option C
Explaination / Solution:
The virus in which genetic material is RNA are called retrovirus. In this virus reverse transcription takes place to form DNA that synthesis proteins.
Q5. A cell immersed in a solution increase in volume. The solution is
Answer : Option A
Explaination / Solution:
The behaviour of the plant cells (or tissues) with regard to water movement depends on the surrounding solution. If the external solution is more dilute than the cytoplasm, it is hypotonic Cells swell in hypotonic solutions.
Q6. Magnesium is component of
Answer : Option A
Explaination / Solution:
It is absorbed by plants in the form of divalent Mg2+. Magnesium is a constituent of the ring structure of chlorophyll and helps to maintain the ribosome structure.
Q7. ____ from pharynx is conveyed into oesophagus by _____ .
Answer : Option B
Explaination / Solution:
Bolus from pharynx is conveyed into oesophagus by deglutition. Bolus is the semisolid chewed food mixed with saliva in mouth. The food from pharynx passed to oesophagus by swallowing.
Q8. Animals giving birth to young ones are called as
Answer : Option A
Explaination / Solution:
Animals reproduce sexually either by producing fertilized egg or by giving birth young ones directly. The viviparous (young one producing) is more evolved method of sexual reproduction.
Q9. Secondary plant products are of great use in commerce in making
Answer : Option C
Explaination / Solution:
Many secondary plant products are of great use in commerce in making drug and perfumes. The primary product of plants is carbohydrates synthesized during photosynthesis.
Q10. The stacks of closely packed thylakoids is called
Answer : Option D
Explaination / Solution:
Granum : A stacked membranous structure within the chloroplasts of plants and green algae that contains the chlorophyll and is the site of the light reactions of photosynthesis. The saclike membranes that make up grana are known as thylakoids.
