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Practice Paper

The document consists of a series of questions related to human reproductive biology, including ovarian events, embryo development, and plant reproduction. It covers topics such as ovulation, hormonal influences, embryo stages, and the significance of certain plant reproductive features. Additionally, it addresses concepts like polyembryony and parturition signals in humans.

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shoryachaurasia30
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14 views2 pages

Practice Paper

The document consists of a series of questions related to human reproductive biology, including ovarian events, embryo development, and plant reproduction. It covers topics such as ovulation, hormonal influences, embryo stages, and the significance of certain plant reproductive features. Additionally, it addresses concepts like polyembryony and parturition signals in humans.

Uploaded by

shoryachaurasia30
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Q1.

Read the text carefully and answer the questions:

The following is the illustration of the sequence of ovarian events in a human female.

A B C D E F G

a) Identify the figure that illustrates ovulation and mentions the stage of oogenesis it represents.
b) Name the ovarian hormone and the pituitary hormone that have caused the above-mentioned
event.
c) Explain changes that occur in the uterus simultaneously in anticipation.

Q2. Study the figure below and answer the questions that follow:

a) Name the stage of human embryo the figure represents.


b) Identify ‘a’ in the figure and mention its function.
c) Mention the fate of the inner cell mass after implantation in the uterus.
d) Where are the stem cells located in this embryo and what is their function?

Q3. What develops into a microspore mother cell in a flower? Trace the development of this cell into a
pollen grain which is ready for germination. Draw a labelled figure of a mature pollen grain.

Q4. Explain the significance of each of the following features present in plants given below.

a) In rose -bay plant the stamen ripen before the stigma.


b) In certain species of primrose the flowers have short statement and long style.
c) The bisexual flowers of mustard exhibits rejection of self Pollen grain.
d) Explain how autogamy is prevented in Castor and papaya plant respectively.

Q5.

a) During Polyembryony if one embryo is formed from synergids and the other from nucellus, state
the one that Is haploid and the one that is diploid.
b) Is it possible that an unfertilised apomictic embryo sac give rise to a diploid embryo? Give a
reason in support of your answer.
Q6. Given below is a flowchart Showing ovarian changes during menstrual cycle.

Primary follicle

Graafian follicle

Ova

Corpus luteum

a) Fill the spaces giving the names of the hormone responsible for the events shown.
b) Name the source of the hormone C.

Q7.

a) Where do the signals for parturition originate from in humans?


b) Why is it important to feed the new born babies on colostrum?

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