Biology - Online Test
Q1. Bladders of Uricularia and Pitchers of Nepenthes are modification of
Answer : Option C
Explaination / Solution:
Bladders of Uricularia and Pitcher of Nepenthes are modification of leaves. They are modified to catch insects that is insectivorous plants.
Q2. Filiform apparatus present at micropylar part of the Synergids help in
Answer : Option A
Explaination / Solution:
Filiform apparatus is finger-like projection attached with egg apparatus. This apparatus guide the pollen tube carrying male gametes for facilitating Syngamy.
Q3. The mechanism of distributing centriole pairs to the daughter cells is called
Answer : Option A
Explaination / Solution:
The mechanism of distributing chromosomes to the daughter cells is called astral division. This kind of division occurs in animal cells.
Q4. The polyacrylamide gel is used to separate proteins as
Answer : Option B
Explaination / Solution:
Protein molecules are smaller than DNA polynucleotide. Protein and DNA can be separated by polyacrylamide gel having minute pores through which protein can pass but not the DNA.
Q5. The filtration fraction is the ratio of GFR to RPF where both the values are in ml/min and FF is expressed in percentage. Calculate FF for a normal adult human being, if RPF= 600ml/min :
Answer : Option D
Explaination / Solution:
Filtration fraction is the ratio of glomerular filtration rate (GFR) to the renal plasma flow (RPF). GFR of normal human is 120 ml/min. so,
FF =
= = 20%.
Q6. An important evidence in favour of organic evolution is the occurrence of
Answer : Option D
Explaination / Solution:
There are many evidences that favor the organic evolution of life. According to this concept life originate from pre-existing organisms by evolution in cousr of time. Homologous and vestigial organs hit the uses of different organs in different organism for different purpose.
Q7. In monocotyledons, guard cell of stomata are
Answer : Option C
Explaination / Solution:
In monocotyledons, the guard cell of stomata are dumb-bell shaped, thicker on top and bottom and thinner in the middle.
Q8. It is the testing of a biological activity like growth response of a substance by employing a living material like plant or plant part.
Answer : Option B
Explaination / Solution:
Testing of biological activity like growth response of a substance by employing a living material like plant or plant part is called bioassay. It is used to know the effect of substance on plant growth.
Q9. Wildlife is destroyed most when
Answer : Option C
Explaination / Solution:
Wildlife is destroyed most when natural habitat is destroyed. The organisms survive and reproduce only in the natural habitat. Loss of habitat of wild animals is the main reason behind the extinction of organisms,
Q10. Vegetatively propagated plants are generally
Answer : Option C
Explaination / Solution:
In vegetative propagation is the asexual mode of reproduction in which plants parts are used to grow new plants. Since fusion of gametes is not involved in the process all individual produced vegetatively are genetically similar.
