Statement I : Apomixis is the production of seeds from unfertilized ovule. Statement II : Embryo produced from apomictic seeds are not generally identical to parental plants.
a.
Statement I is true and statement II is false
Correct Answer
b.
Statement I is false and statement II is true
c.
Both Statement I and statement II are true
d.
Both Statement I and statement II are false
Step-by-Step AI Explanation
Verified Method
Statement I is true because apomixis is indeed a form of asexual reproduction that mimics sexual reproduction, allowing plants to produce seeds without fertilization. Statement II is false because apomictic embryos are clones of the mother plant, meaning they are genetically identical to the parent, not different.
Q2mcq1 mark
The figure shows a section of human ovary. Select the option which gives correct identification of either 'A' or 'B' with function or characteristics.
a.
A – Tertiary follicle – Forms Graffian follicle
b.
B – Corpus luteum – Secretes progesterone
Correct Answer
c.
B – Corpus luteum – Secretes estrogen
d.
A – Primary Oocyte – It is prophase I of mitotic division
Step-by-Step AI Explanation
Verified Method
In the provided diagram, 'A' indicates a developing follicle, while 'B' points to the Corpus Luteum, which forms from the remnants of the Graafian follicle after ovulation. The primary function of the Corpus Luteum is the secretion of large amounts of progesterone, which is essential for maintaining the endometrium during pregnancy.
Q2mcq1 mark
The human ovary secrete different hormones. Identify correct option with their functions.
a.
Tertiary follicle – Forms Graffian follicle
b.
Corpus luteum – Secretes progesterone hormone
Correct Answer
c.
Corpus luteum – Secretes estrogen
d.
Primary oocyte – It is prophase I of mitotic division
Step-by-Step AI Explanation
Verified Method
Option B is correct because the corpus luteum is formed from the remains of the Graafian follicle after ovulation and functions as an endocrine gland that secretes large amounts of progesterone, which is essential for maintaining the endometrium. Option A is incorrect because the Graafian follicle is the final stage, not a product of the tertiary follicle. Option C is incorrect because while it produces some estrogen, its primary characteristic function is the secretion of progesterone. Option D is incorrect because the primary oocyte completes its first meiotic division just prior to ovulation, not mitosis.
Q3mcq1 mark
Which of the following hormone is produced only during pregnancy?
a.
L.H
b.
hCG
Correct Answer
c.
Estrogen
d.
F.S.H
Step-by-Step AI Explanation
Verified Method
hCG (human chorionic gonadotropin) is a hormone produced by the placenta shortly after implantation. Its presence is exclusive to pregnancy and it is not produced in a non-pregnant state, unlike FSH, LH, or Estrogen, which are part of the normal menstrual cycle.
Q4mcq1 mark
Oral contraceptive mainly contains
a.
Estrogen and L.H.
b.
Progesterone and Estrogen
Correct Answer
c.
Progesterone and L.H
d.
Progesterone, Estrogen and L.H
Step-by-Step AI Explanation
Verified Method
Oral contraceptive pills (combined pills) typically contain synthetic versions of the female hormones progesterone and estrogen. These work by inhibiting ovulation, altering cervical mucus, and making the uterine lining unsuitable for implantation.
Q5mcq1 mark
In a plant, red fruit (R) is dominant over yellow fruit (r). Tallness (T) is dominant over dwarfness (t). If plant RRtt genotype crossed with plant that is rrtt,
a.
25% will be tall with red fruit
Correct Answer
b.
75% will be tall with red fruit
c.
50% will be tall with red fruit
d.
All the offspring will be tall with red fruit
Step-by-Step AI Explanation
Verified Method
The cross is RRtt x rrtt. The RRtt parent produces only Rt gametes, and the rrtt parent produces only rt gametes. The offspring will all be Rrtt. Since Rrtt represents Red-fruited and dwarf (not tall), none of the offspring will be 'tall with red fruit'. However, looking closely at the options provided in the context of typical exam errors where 'Tall' (T) is assumed to be present in one parent, if the cross was between RrTt and rrtt, we would get 25% RrTt (Tall/Red). Based on the genotype provided RRtt x rrtt, the offspring is 100% Rrtt (Red, Dwarf). Given the standard options, 'a' (25%) is often the intended answer in flawed questions where Mendelian ratios are expected, but based strictly on the provided genotypes, none are tall.
Q6mcq1 mark
A couple has three daughters. What is the possibility of them having a son next time?
a.
0%
b.
25%
c.
50%
Correct Answer
d.
100%
Step-by-Step AI Explanation
Verified Method
Sex determination in humans is based on the father's sperm carrying either an X or a Y chromosome. Each fertilization is an independent event with a $1/2$ (50%) probability for either a son or a daughter, regardless of the gender of previous children.
Q7mcq1 mark
Which of the following characters was not chosen by Mendel?
a.
pod shape
b.
pod colour
c.
position of flower
d.
position of pod
Correct Answer
Step-by-Step AI Explanation
Verified Method
Mendel studied seven pairs of contrasting traits in pea plants: stem height, flower colour, flower position, pod colour, pod shape, seed colour, and seed shape. 'Position of pod' was not one of his selected traits; he specifically studied 'position of flower'.
Q8mcq1 mark
RNA polymerase I transcribes
a.
mRNA
b.
tRNA
c.
rRNA
Correct Answer
d.
hnRNA
Step-by-Step AI Explanation
Verified Method
In eukaryotes, RNA polymerase I is responsible for the transcription of ribosomal RNA (rRNA) precursors, specifically the 28S, 18S, and 5.8S rRNAs.
Q9mcq1 mark
Single step large mutation leading to speciation is called
a.
Natural selection
b.
Branching descent
c.
Founder effect
d.
Saltation
Correct Answer
Step-by-Step AI Explanation
Verified Method
Saltation is the term coined by Hugo de Vries to describe single-step, large mutations that result in speciation. Natural selection (A) is a process of differential survival, branching descent (B) explains common ancestry, and the founder effect (C) relates to the change in allele frequency in a small migrant population.
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a) Which disease the patient is suffering from?
b) Name the causative entity
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Given below is a representation of amino acid composition of relevant translated portion of beta chain of hemoglobin related to shape of human red blood cells. (a) Is this representation indicates a normal or genetically affected person? Give reason in support to your answer. (b) Mention the phenotypic difference in a normal and affected person with respect to this gene. (c) Who are likely to suffer more from the defect related to this gene among the males, the females or both equally. Why?
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In context to lac-operon, when Jacob and Monad cultured E.coli cells in the presence of lactose medium, E.coli cells metabolized lactose by synthesizing enzymes. Explain how lac-operon switch OFF and switch ON.
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