Recent questions tagged reproduction

random distribution of 23 pairs of chromosomes during miosis could be

asked Jan 31, 2015 by aradhya.dutta200

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change in hormonal levels during ovulation.

asked Jan 30, 2015 by aradhya.dutta200

1 answer

Regarding the figure : 1. It shows asexual reproduction in sponge 2. Reproductive structures are gemmules. 3. The most common of asexual reproductive structures (in living world) is zoospores which are usually microscopic and non-motile.

asked Apr 4, 2014 by pady_1

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Choose the odd one out : (on the basis of oestrous and menstrual cycle)

asked Apr 4, 2014 by pady_1

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Parthenogenesis occurs in all except :

asked Apr 4, 2014 by pady_1

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Regarding asexual reproductive structures : Match the following & choose the most appropriate option:

asked Apr 4, 2014 by pady_1

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Asexual reproduction : 1. Cell division is itself a mode of reproduction in Protists and Monerans. 2. Many single-celled organisms reproduce by binary fission, where a cell divides into two halves and each rapidly grows into an adult (e.g., Amoeba, Paramecium). 3. In yeast, the division is unequal and small buds are produced that remain attached initially to the parent cell which, eventually gets separated and mature into new yeast organisms. Regarding 1, 2 and 3 :

asked Apr 4, 2014 by pady_1

1 answer

The gynoecium may consist of a single pistil or may have more than one pistil . When there are more than one, the pistils may be fused together or may be free ___ . Identify A and B:

asked Apr 4, 2014 by pady_1

1 answer

Identify A, B, C and D in order in the picture and identify the type of fruit shown - choose the appropriate option :

asked Apr 4, 2014 by pady_1

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Identify A, B, C and D in order in the picture - choose the appropriate option :

asked Apr 4, 2014 by pady_1

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Choose the odd one out : (on the basis of number of ovules)

asked Apr 4, 2014 by pady_1

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Choose the appropriate option and fill in the blank : A typical angiosperm embryo sac, at maturity, is _________________________ .

asked Apr 4, 2014 by pady_1

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Identify the wrongly matched pair:

asked Apr 4, 2014 by pady_1

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Artificial hybridisation : 1. Removal of anthers from the flower bud before the anthers dehisces using a pair of forceps is emasculation. 2. Emasculated flowers are covered with a bag of suitable size, generally made up of butter paper; and the process is called bagging.

asked Apr 4, 2014 by pady_1

1 answer

Apomixis is

asked Apr 4, 2014 by pady_1

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Regarding Types of pollination : Match the following and choose the most appropriate option: (each option on 3 columns can be matched to multiple options on the another 2 columns) eg. A-(iv)-3,5; B-(i); C-(iii)-2; D-(ii),(vi),(vii)-1; (iii),(v)-6;

asked Apr 4, 2014 by pady_1

1 answer

Fruits: 1. There are a few species in which fruits develop without fertilisation. 2. Fruits developing without fertilisation are called parthenocarpic fruits. 3. Parthenocarpy can be induced through application of growth hormones 4. Parthenocarpic fruits are usually seeded. Regarding 1, 2, 3 and 4 :

asked Apr 4, 2014 by pady_1

1 answer

The second maturation division of the mammalian ovum occurs

asked Apr 4, 2014 by pady_1

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The testes in humans are situated outside the abdominal cavity inside a pouch called *******. The purpose served is for

asked Apr 4, 2014 by pady_1

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Which of the following is a mode of reproduction in animals in which embryos develop inside eggs that are retained within the mother's body until they are ready to hatch?

asked Apr 4, 2014 by pady_1

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Bartholin glands or greater vestibular glands in adult females is homologous to what in adult males?

asked Apr 4, 2014 by pady_1

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The primitive gut that forms during which stage in the developing embryo is known as the archenteron?

asked Apr 4, 2014 by pady_1

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Where in the human body are the Sertoli cells located?

asked Apr 4, 2014 by pady_1

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Which one of the following statements about human sperm is correct?

asked Apr 4, 2014 by pady_1

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Which of the following is incorrect? (1) Human embryos have two pairs of ducts to let gametes out of the body, (2) Wolffian ducts develops in males into the epididymis and vas deferens, (3) Müllerian ducts develops in females into the Fallopian tubes, uterus and ******

asked Apr 4, 2014 by pady_1

1 answer

Where are the Bartholin's glands situated ?

asked Apr 4, 2014 by pady_1

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Which of the following hormones is not a secretion product of human placenta ?

asked Apr 4, 2014 by pady_1

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Ovulation in the human female normally takes place midway during the menstrual cycle in which of the following phases?

asked Apr 4, 2014 by pady_1

1 answer

LACTATION : 1. The mammary glands of the female undergo differentiation during pregnancy and starts producing milk towards the end of pregnancy by the process called lactation. 2. The milk produced during the initial few days of lactation is called colostrum which should be discarded. Regarding 1 and 2 :

asked Apr 3, 2014 by pady_1

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Regarding inner cell mass - choose the correct option :

asked Apr 3, 2014 by pady_1

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Regarding hormonal changes essential for supporting the fetal growth, metabolic changes in the mother and maintenance of pregnancy - choose the incorrect option :

asked Apr 3, 2014 by pady_1

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1. After implantation, finger-like projections appear on the trophoblast called chorionic villi which are surrounded by the uterine tissue and maternal blood. 2. The chorionic villi and uterine tissue become interdigitated with each other and jointly form a structural and functional unit between developing embryo (foetus) and maternal body called placenta. Regarding 1 and 2 :

asked Apr 3, 2014 by pady_1

1 answer

Choose the incorrect statement:

asked Apr 3, 2014 by pady_1

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Assertion (A): Only one sperm can fertilise an ovum. Reason (R): During fertilisation, a sperm comes in contact with the zona pellucida layer of the ovum and induces changes in the membrane that block the entry of additional sperms. Regarding (A) and (R):

asked Apr 3, 2014 by pady_1

1 answer

1. The process of fusion of a sperm with an ovum is called fertilisation. 2. During fertilisation, a sperm comes in contact with the zona pellucida layer of the ovum and induces changes in the membrane. Regarding 1 and 2 :

asked Apr 3, 2014 by pady_1

1 answer

Assertion (A): All copulations lead to fertilisation and pregnancy. Reason (R): Fertilisation can occur if the ovum and sperms are transported simultaneously to the ampullary-isthmic junction. Regarding (A) and (R):

asked Apr 3, 2014 by pady_1

1 answer

Assertion (A): In the absence of fertilisation menstruation occurs. Reason (R): The corpus luteum degenerates. This causes disintegration of the endometrium leading to menstruation. Regarding (A) and (R):

asked Apr 3, 2014 by pady_1

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1. During pregnancy some events of the menstrual cycle continue to occur. 2. But there is no menstruation. Regarding 1 and 2 :

asked Apr 3, 2014 by pady_1

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Assertion (A): Ovulation occurs during early menstrual cycle. Reason (R): Rapid secretion of LH leading to its maximum level called LH surge induces rupture of Graafian follicle and thereby the release of ovum. Regarding (A) and (R):

asked Apr 3, 2014 by pady_1

1 answer

In the middle of the menstrual cycle :

asked Apr 3, 2014 by pady_1

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Regarding the secretion of gonadotropins in menstrual cycle- choose the incorrect one :

asked Apr 3, 2014 by pady_1

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Regarding follicular phase - choose the incorrect one :

asked Apr 3, 2014 by pady_1

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Regarding menstrual cycle - choose the incorrect one :

asked Apr 3, 2014 by pady_1

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Ovulation is : (choose the most appropriate option)

asked Apr 3, 2014 by pady_1

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Regarding time frame for embryonal & fetal development : Match the following & choose the most appropriate option:

asked Apr 2, 2014 by pady_1

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Regarding uterine layers : Match the following and choose the most appropriate option:

asked Apr 2, 2014 by pady_1

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Regarding reproductive events in humans : Match the following and choose the most appropriate option:

asked Apr 2, 2014 by pady_1

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Causative organisms of STDs: Match the following and choose the most appropriate option:

asked Apr 2, 2014 by pady_1

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Causative organisms of STDs: Match the following and choose the most appropriate option:

asked Apr 2, 2014 by pady_1

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Causative organisms of STDs: Match the following and choose the most appropriate option:

asked Apr 2, 2014 by pady_1

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