Assertion: Parturition is induced by a complex neuro endocrine meachanism.
Reason: At the end of gestation period, the maternal pituitary releases prolactin which
causes uterine contractions.

Assertion: When the two genes in a dihybrid cross are situated on the same
chromosome, the proportion of parental gene combinations is much higher than non-
parental type.
Reason: Higher parental gene combinations can be attributed to crossing over
between two genes.

Concentration of which of the following substances will decrease in the maternal blood
as it flows from embryo to placenta through the umbilical cord?

i. Oxygen
ii. Amino Acids
iii. Carbon dioxide
iv. Urea
A. i and ii
B. ii and iv
C. iii and iv
D. i and iv9

In a fertilized ovule, n, 2n and 3n conditions occur respectively in
A. antipodal, zygote and endosperm
B. zygote, nucellus and endosperm
C. endosperm, nucellus and zygote.
D. antipodals, synergids and integusments

A botanist studying Viola (common pansy) noticed that one of the two flower types
withered and developed no further due to some unfavorable condition, but the other
flower type on the same plant survived and it resulted in an assured seed set. Which
of the following will be correct?
A. The flower type which survived is Cleistogamous and it always exhibits autogamy
B. The flower type which survived is Chasmogamous and it always exhibits
geitonogamy.
C. The flower type which survived is Cleistogamous and it exhibits both autogamy
and geitonogamy.
D. The flower type which survived is Chasmogamous and it never exhibits autogamy.

During parturition, a pregnant woman is having prolonged labour pains and child birth
has to be fastened. It is advisable to administer a hormone that can
A. increase the metabolic rate.
B. release glucose in the blood.
C. stimulate the ovary.
D. activate smooth muscles.

A female undergoing IVF treatment has blocked fallopian tubes. The technique by
which the embryo with more than 8 blastomeres will be transferred into the female for
further development is
A. ZIFT
B. GIFT
C. IUT
D. AI

The mode of action of the copper ions in an IUD is to
A. increase the movement of sperms.
B. decrease the movement of the sperms.
C. make the uterus unsuitable for implantation.
D. make the cervix hostile to the sperms.

To produce 400 seeds, the number of meiotic divisions required will be
A. 400
B. 200
C. 500
D. 800

A cross is made between tall pea plants having green pods and dwarf pea plants
having yellow pods. In the F2 generation, out of 80 plants how many are likely to be tall
plants?
A. 15
B. 20
C. 45
D. 60

In Antirrhinum, RR is phenotypically red flowers, rr is white and Rr is pink. Select the
correct phenotypic ratio in F1 generation when a cross is performed between RR X Rr:
A. 1 red: 2 Pink: 1 white
B. 2 Pink: 1 white
C. 2 Red: 2 Pink
D. All Pink

What would be the genotype of the parents if the offspring have the phenotypes in 1:1
proportion?
A. Aa X Aa
B. AA X AA
C. Aa X AA
D. Aa x aa

What is the pattern of inheritance in the above pedigree chart?

A. Autosomal dominant
B. Autosomal recessive
C. Sex -linked dominant
D. Sex -linked recessive

A couple has two daughters. What is the probability that the third child will also be a
female?
A. 25%
B. 50%
C. 75%
D. 100%

Genotypic ratio of 1:2:1 is obtained in a cross between
A. AB X AB
B. Ab X Ab
C. Ab X ab
D. ab X ab