Is the use of contraceptives justified? Give reasons.
What are the suggested reasons for population explosion?
Do you think that reproductive health in our country has improved in the past 50 years? If yes, mention some such areas of improvement.
Is sex education necessary in schools? Why?
Suggest the aspects of reproductive health which need to be given special attention
in the present scenario
What do you think is the significance of reproductive health in a society?
Calculate the drift velocity of electrons in a copper wire of cross-sectional area 1 mm2 when a current of 2.5 A flows through it.
For copper, n = 8.5 × 1028 per m3
The charge on an electron, Q = 1.6 × 10-19 C
How many eggs do you think were released by the ovary of a female dog which gave birth to 6 puppies?
How many eggs do you think were released by the ovary of a female dog which gave birth to 6 puppies?
How many eggs are released by a human ovary in a month? How many eggs do you think would have been released if the mother gave birth to identical twins? Would your answer change if the twins born were fraternal?
In our society the women are often blamed for giving birth to daughters. Can you explain why this is not correct?
What is parturition? Which hormones are involved in induction of parturition?
What is menstrual cycle? Which hormones regulate menstrual cycle?
Identify True/False statements. Correct each false statement to make it true.
(a) Androgens are produced by Sertoli cells. (True/False)
(b) Spermatozoa get nutrition from Sertoli cells. (True/False)
(c) Leydig cells are found in ovary. (True/False)
(d) Leydig cells synthesise androgens. (True/False)
(e) Oogenesis takes place in corpus luteum. (True/False)
(f) Menstrual cycle ceases during pregnancy. (True/False)
(g) Presence or absence of hymen is not a reliable indicator of virginity or sexual experience. (True/False)
Name the functions of the following.
(a) Corpus luteum
(b) Endometrium
(c) Acrosome
(d) Sperm tail
(e) Fimbriae
What is oogenesis? Give a brief account of oogenesis
What are the major functions of male accessory ducts and glands
What are the major components of seminal plasma?
Define spermiogenesis and spermiation.
Name the hormones involved in regulation of spermatogenesis
What is spermatogenesis? Briefly describe the process of spermatogenesis.
Describe the structure of a seminiferous tubule.
Write two major functions each of testis and ovary.
What is apomixis and what is its importance?
The minimum velocity (in ms-I) with which a car driver must traverse a flat curve of radius 150 m and coefficient of friction 0.6 to avoid skidding is :
Explain the role of tapetum in the formation pollen-grain wall.
If one can induce parthenocarpy through the application of growth substances, which fruits would you select to induce parthenocarpy and why?
What is meant by emasculation? When and why does a plant breeder employ this technique?
Why is apple called a false fruit? Which part(s) of the flower forms the fruit?
Differentiate between:
(a) Hypocotyl and epicotyl;
(b) Coleoptile and coleorrhiza;
(c) Integument and testa;
(d) Perisperm and pericarp.
Why do you think the zygote is dormant for sometime in a fertilized ovule?
What is triple fusion? Where and how does it take place? Name the nuclei involved in
triple fusion.
What is bagging technique? How is it useful in a plant breeding programme?
What is self-incompatibility? Why does self-pollination not lead to seed formation in self-incompatible species?
Mention two strategies evolved to prevent self-pollination in flowers
What are chasmogamous flowers? Can cross-pollination occur in cleistogamous flowers? Give reasons for your answer
Explain the 7-celled, 8-nucleate nature of the female gametophyte.
What is meant by monosporic development of female gametophyte?
What is meant by monosporic development of female gametophyte?
describe the parts of a typical angiosperm ovule.
describe the parts of a typical angiosperm ovule.
Arrange the following terms in the correct developmental sequence:
Pollen grain, sporogenous tissue, microspore tetrad, pollen mother cell, male gametes
Differentiate between microsporogenesis and megasporogenesis. Which type of cell division occurs during these events? Name the structures formed at the end of these two events.
Name the parts of an angiosperm flower in which development of male and female gametophyte take place
The apparent weight of a man in a lift is W1. When lift move upward with same acceleration and is W2 when it is accelerating down with same acceleration. Find the true weight of the man and acceleration of lift.
Differentiate between gametogenesis from embryogenesis.
Why are offspring of oviparous animals at a greater risk as compared to offspring of viviparous animals?
Examine a few flowers of any cucurbit plant and try to identify the staminate and
pistillate flowers. Do you know any other plant that bears unisexual flowers?
What is a bisexual flower? Collect five bisexual flowers from your neighborhood and with the help of your teacher find out their common and scientific names
Describe the post-fertilization changes in a flower
Differentiate between a zoospore and a zygote