Question 1
A male ant is _______________
A. Polyploid
B. Triploid
C. Diploid
D. Monoploid
View Answer
Answer: Option D
Explanation:
Male ants, bees and wasps are produced by parthenogenesis, thus they have only one set of genes that was present in their mother- being monoploid.
Question 2
A male bee can’t have a________________
A. Mother
B. Faher
C. Grand father
D. Grand mother
View Answer
Answer: Option C
Explanation:
A male bee is produced from the unfertilized eggs by parthenogenesis, thus it will have a mother but not a father. The female mother was produced by fertilization so there is a grandfather and grandmother.
Question 3
Choose the odd one out?
A. Leaf
B. Endosperm
C. Fertilized egg
D. Petals
View Answer
Answer: Option B
Explanation:
Making a distinction on the basis of a number of sets of chromosome- endosperm is triploid while the rest are diploid.
Question 4
Colchicine is used to cause______________
A. Mitotic non-disjunction
B. Meiotic non-disjunction
C. Mitotic disjunction
D. Meiotic disjunction
View Answer
Answer: Option A
Explanation:
Colchinine causes an arrest in anaphase which leads to mitotic non-disjunction halting the mitosis. This leads to doubling of chromosome as the duplicated chromatins fail to separate.
Question 5
Euploidy is a chromosomal variation in ______________________
A. Size
B. Position of genes
C. Number
D. Structure
View Answer
Answer: Option C
Explanation:
Euploidy is chromosomal variation in number which shows increase or decrease in complete set of chromosome number.
Question 6
Euploidy is a form of allopoliplody.
A. True
B. False
View Answer
Answer: Option B
Explanation:
In euploidy there is an increase in chromosomal set due to duplication of originally existing set and not due to blending of chromosomes of two organisms. Thus it is autoploidy and not Alloploidy.
Question 7
Farmers often practice polyploidy as ____________________
A. It makes the plants more durable
B. They take longer time to undergo meiosis
C. It increases complexity and there is a hope of new species
D. It produces larger plant parts and products
View Answer
Answer: Option D
Explanation:
In case of polyploid, more is the number of chromosome set more is the amount of gene product. As a result the plant will be larger is size which is a commercial profit.
Question 8
In an experiment, you culture the anthers and leaves of a flower. You see the plants so generated are_____________
A. Triploid
B. Monoploid and diploid
C. Diploid and triploid
D. Diploid
View Answer
Answer: Option B
Explanation:
Anthers are the meiosis products, so the plant generated from it is monoploid. Leaf is a normal diploid somatic tissue which will give to diploid individual.
Question 9
In animals polypoidy is rarely practiced as _______________
A. Giants are harder to train and take care of
B. Increase in size is not appreciable
C. It is often sterile
D. Animal cells are resistant to colchicine
View Answer
Answer: Option B
Explanation:
The other options being true, in animals there is a more strict regulation of gene product formation than in the case of plants. In animals with an increase in cell size there would be a decrease in cell number keeping the ultimate animal sizes same. It is thus not profitable at all.
Question 10
Normal wheat Triticum aestivum is ___________
A. Monoploid
B. Tetraploid
C. Pentaploid
D. Hexaploid
View Answer
Answer: Option D
Explanation:
Triticum aestivum is hexaploid i.e. there are 6 set of chromosomes in it. This fertile as the segregation in divalent is possible.
Question 11
Which of the following pairing will not occur during meiosis of tetraploid?
A. Two bivalent
B. One bivalent and two univalent
C. Trivalent and univalent
D. Quadrivalent
View Answer
Answer: Option B
Explanation:
In normal pairing all available chromosomes with complimentary are paired, so the existence of two univalent which are free to pair is not possible. However in case of trivalent and univalent as one of the other set is not available univalent exists.