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Recent questions tagged biology
Questions
Assertion & Reason types:(A)Chemical means of farming are being replaced by organic means.(R) Organic farming is more productive.
jeemain
biology
ecology-and-environment
medium
asked
Mar 24, 2014
by
sreemathi.v
1
answer
In the following species-area log curve
jeemain
biology
ecology-and-environment
medium
asked
Mar 24, 2014
by
sreemathi.v
1
answer
Equation of logistic curve is
jeemain
biology
ecology-and-environment
medium
asked
Mar 24, 2014
by
sreemathi.v
1
answer
In an ecosystem which one shows one way passage
jeemain
biology
ecology-and-environment
medium
asked
Mar 24, 2014
by
sreemathi.v
1
answer
In tropical rain forest,the soil is characterised by :-
jeemain
biology
ecology-and-environment
medium
asked
Mar 24, 2014
by
sreemathi.v
1
answer
Cuscuta's made of nutrition
jeemain
biology
ecology-and-environment
medium
asked
Mar 24, 2014
by
sreemathi.v
1
answer
Due to exinction of pollinator bee,a plant with obligate mutualism with this bee extinct.This can be placed in which cause of extinction?
jeemain
biology
ecology-and-environment
easy
asked
Mar 24, 2014
by
sreemathi.v
1
answer
1. The theca layer of ovarian follicles is organised into an inner theca interna and an outer theca externa. 2. The primary oocyte within the tertiary follicle grows in size and completes its first meiotic division. 3. First meiotic division is an unequal division resulting in the formation of a large haploid tertiary oocyte and a tiny first polar body Regarding 1,2 and 3 :
aipmt
ch3
medium
class12
reproduction
biology
asked
Mar 20, 2014
by
pady_1
1
answer
1. Each primary oocyte then gets surrounded by a layer of granulosa cells and is called the primary follicle. 2. The primary follicles get surrounded by more layers of granulosa cells and a new theca and are called secondary follicles. 3. The secondary follicle soon transforms into a tertiary follicle which is characterised by a fluid filled cavity called antrum. Regarding 1,2 and 3 :
aipmt
ch3
medium
class12
reproduction
biology
botany
asked
Mar 20, 2014
by
pady_1
1
answer
1. Oogonia start division and enter into prophase-II of the meiotic division 2. Oogonia get temporarily arrested at that stage are called primary oocytes. 3. Each primary oocyte then gets surrounded by a layer of granulosa cells and is called the primary follicle. Regarding 1,2 and 3 :
aipmt
ch3
medium
class12
reproduction
biology
asked
Mar 20, 2014
by
pady_1
1
answer
1. The process of formation of a mature female gamete is called oogenesis. 2. Oogenesis is initiated during puberty when a couple of million gamete mother cells (oogonia) are formed within each mature ovary. 3. More oogonia are formed and added during 18 to 35 years (reproductive period). Regarding 1,2 and 3 :
aipmt
ch3
difficult
class12
reproduction
biology
asked
Mar 20, 2014
by
pady_1
1
answer
1. Sperms released from the seminiferous tubules, are transported by the accessory ducts. 2. Secretions of epididymis, vas deferens, seminal vesicle and prostate are essential for maturation of sperms. 3. Secretions of epididymis, vas deferens, seminal vesicle and prostate are essential for motility of sperms. Regarding 1,2 and 3 :
aipmt
ch3
difficult
class12
reproduction
biology
asked
Mar 20, 2014
by
pady_1
1
answer
The human male ejaculates (i) about 20 to 30 million sperms during a coitus of which, (ii) for normal fertility, at least 40 per cent sperms must have normal shape and size and (iii) for normal fertility, at least 50 per cent of them must show vigorous motility. Regarding (i), (ii) and (iii) :
aipmt
ch3
medium
class12
reproduction
biology
asked
Mar 20, 2014
by
pady_1
1
answer
1. A plasma membrane envelops the whole body of sperm. 2. The sperm head contains an elongated haploid nucleus. 3. The posterior portion of nucleus is covered by a cap-like structure, acrosome. 4. The acrosome is filled with enzymes that help fertilisation of the ovum. Regarding 1,2,3 and 4 :
aipmt
ch3
medium
class12
reproduction
biology
asked
Mar 20, 2014
by
pady_1
1
answer
1. The spermatids are transformed into spermatozoa by the process called gametogenesis. 2. After spermiogenesis, sperm heads become embedded in the Leydig cells. 3. And they are finally released from the seminiferous tubules by the process called spermiation. Regarding 1,2 and 3 :
aipmt
ch3
medium
class12
reproduction
biology
asked
Mar 20, 2014
by
pady_1
1
answer
1. Primary spermatocytes periodically undergo meiosis. 2. A primary spermatocyte completes the first meiotic division leading to formation of four secondary spermatocytes. 3. Secondary spermatocytes undergo the second meiotic division to produce four unequal, haploid spermatids. Regarding 1,2 and 3 :
aipmt
ch3
medium
class12
reproduction
biology
asked
Mar 20, 2014
by
pady_1
1
answer
1. Each spermatogonium contains 46 chromosomes. 2. Primary spermatocytes have 23 chromosomes each. 3. Secondary spermatocytes also have 23 chromosomes each. Regarding 1,2 and 3 :
aipmt
ch3
medium
class12
reproduction
biology
asked
Mar 20, 2014
by
pady_1
1
answer
In testis: 1. The immature male germ cells are called spermatogonia (sing. spermatogonium). 2. Spermatogonia produce sperms by spermatogenesis. 3. Spermatogenesis begins at puberty. Regarding 1,2 and 3 :
aipmt
ch3
easy
class12
reproduction
biology
asked
Mar 20, 2014
by
pady_1
1
answer
Given the following statements:
aipmt
ch3
medium
class12
reproduction
biology
zoology
asked
Mar 20, 2014
by
pady_1
1
answer
1. The glandular tissue of each breast is divided into 5-10 mammary lobes containing clusters of cells called alveoli. 2. The cells of alveoli secrete milk. 3. Milk is stored in the cavities (lumens) of alveoli. Regarding 1,2 and 3 :
aipmt
ch3
medium
class12
reproduction
biology
asked
Mar 20, 2014
by
pady_1
1
answer
1. Mons pubis is a cushion of fatty tissue covered by skin and pubic hair. 2. The ***** minora are fleshy folds of tissue, which extend down from the mons pubis and surround the vaginal opening. 3. The ***** majora are paired folds of tissue under the ***** minora. Regarding 1,2 and 3 :
aipmt
ch3
medium
class12
reproduction
biology
asked
Mar 20, 2014
by
pady_1
1
answer
1. The uterus opens into ****** through a broad cervix. 2. The cavity of the cervix is called cervical canal. 3. Cervical canal solely forms the birth canal. Regarding 1,2 and 3 :
aipmt
ch3
medium
class12
reproduction
biology
asked
Mar 20, 2014
by
pady_1
1
answer
1. The infundibulum leads to a wider part of the oviduct called isthmus. 2. The last part of the oviduct is ampulla. 3. Ampulla has a narrow lumen. 4. Isthmus joins the uterus. Regarding 1,2,3 and 4 :
aipmt
ch3
medium
class12
reproduction
biology
asked
Mar 20, 2014
by
pady_1
1
answer
1. The ovaries are located one on each side of the upper abdomen. 2. Each ovary is about 2 to 4 cm in length 3. They are connected to the pelvic wall and uterus by ligaments. Regarding 1,2 and 3 :
aipmt
ch3
medium
class12
reproduction
biology
asked
Mar 20, 2014
by
pady_1
1
answer
1. The ***** is the male external genitalia 2. It is made up of special tissue that helps in erection of the ***** 3. Erection of the ***** facilitates insemination. Regarding 1,2 and 3 :
aipmt
ch3
easy
class12
reproduction
biology
asked
Mar 20, 2014
by
pady_1
1
answer
1. The urethra originates from the urinary bladder 2. It extends through the ***** to its external opening 3. Its external opening called urethral meatus. Regarding 1,2 and 3 :
aipmt
ch3
easy
class12
reproduction
biology
asked
Mar 20, 2014
by
pady_1
1
answer
In testes : 1. Each seminiferous tubule is lined on its inside by two types of cells called male germ cells and Sertoli cells. 2. Sertoli cells undergo meiotic divisions finally leading to sperm formation. 3. The male germ cellsprovide nutrition to the germ cells. Regarding 1,2 and 3 :
aipmt
ch3
easy
class12
reproduction
biology
asked
Mar 20, 2014
by
pady_1
1
answer
The male reproductive system : 1. The testes are situated outside the abdominal cavity within a pouch called *******. 2. The ******* helps in maintaining the high temperature of the testes, 2–2.5o C higher than the normal internal body temperature. 3. 2–2.5o C higher than the normal internal body temperature is necessary for spermatogenesis. Regarding 1,2 and 3 :
aipmt
ch3
medium
class12
reproduction
biology
asked
Mar 20, 2014
by
pady_1
1
answer
In artificial insemination (AI) technique: (i) the semen collected from the husband (ii) the semen collected from a healthy donor (iii) is artificially introduced into the ****** of the female (iv) is artificially introduced into the uterus of the female Regarding (i), (ii), (iii) and (iv) :
aipmt
ch4
difficult
class12
reproduction
biology
zoology
asked
Mar 20, 2014
by
pady_1
1
answer
GIFT: Transfer of an ovum collected from a donor (i) into the fallopian tube of another female (ii) who can produce one (iii) but can not provide suitable environment for fertilisation (iv) but can provide suitable environment for further development Regarding (i), (ii), (iii) and (iv) :
aipmt
ch4
difficult
class12
reproduction
biology
zoology
asked
Mar 20, 2014
by
pady_1
1
answer
ART: 1. The zygote or early embryos (with upto 8 blastomeres) could then be transferred into the fallopian tube(ZIFT) 2. Embryos with more than 8 blastomeres, into the uterus, to complete its further development.(IUT) 3. Embryos formed by in-vivo fertilisation (fusion of gametes within the female) also could be used for such transfer to assist those females who cannot conceive. Regarding 1,2 and 3 :
aipmt
ch4
medium
class12
reproduction
biology
asked
Mar 20, 2014
by
pady_1
1
answer
In vitro fertilisation (IVF) : (i) also known as test tube baby programme (ii) ova from the wife/donor (female) and sperms from the husband/donor (male) are collected (iii) they are induced to form zygote (iv) under simulated conditions in the laboratory. Regarding (i), (ii), (iii) and (iv) :
aipmt
ch4
medium
class12
reproduction
biology
asked
Mar 20, 2014
by
pady_1
1
answer
In ART : 1. In vitro fertilisation (IVF ) is fertilisation outside the body 2. It is done in almost similar conditions as that in the body. 3. IVF is followed by embryo transfer (ET) is one of such methods. Regarding 1,2 and 3 :
aipmt
ch4
medium
class12
reproduction
biology
asked
Mar 20, 2014
by
pady_1
1
answer
1. Hepatitis–B and HIV can be transmitted from an infected mother to the foetus too. 2. Hepatitis B virus transmission from mother to unborn child is called vertical transmission. 3. Before semen donation for artificial insemination the screening of donor for HBV is not usually needed Regarding 1,2 and 3 :
aipmt
ch4
difficult
class12
reproduction
biology
zoology
asked
Mar 20, 2014
by
pady_1
1
answer
1. Hepatitis–B and HIV can be transmitted by sharing of injection needles, razors, etc. 2. HIV can be transmitted by using surgical instruments used on for such patients and used after disinfection. 3. Hepatitis–B and HIV can be transmitted by transfusion of blood of an infected person. Regarding 1,2 and 3 :
aipmt
ch4
medium
class12
reproduction
biology
asked
Mar 20, 2014
by
pady_1
1
answer
MTP: 1. MTPs are considered relatively safe during the first trimester. 2. Second trimester abortions are much more riskier. 3. Majority of the MTPs are performed illegally by unqualified quacks which are usually safe. Regarding 1,2 and 3:
aipmt
ch4
medium
class12
reproduction
biology
asked
Mar 20, 2014
by
pady_1
1
answer
In tubectomy: 1. A small part of the fallopian tube is removed or tied up 2. It is done through a small incision in the abdomen or through ******. 3. This technique are least effective 4. But their reversibility is good. Regarding 1,2 and 3:
aipmt
ch4
medium
class12
reproduction
biology
asked
Mar 20, 2014
by
pady_1
1
answer
In vasectomy: 1. A small part of the vas deferens is removed or tied up 2. It is done through a small incision on the ******* 3. Its reversibility is very poor. Regarding 1,2 and 3:
aipmt
ch4
medium
class12
reproduction
biology
asked
Mar 20, 2014
by
pady_1
1
answer
1. Progestogens alone or in combination with estrogen can also be used by females as injections or implants under the skin. 2. Their mode of action is similar to that of pills 3. Their effective periods are short. Regarding 1,2 and 3:
aipmt
ch4
medium
class12
reproduction
biology
asked
Mar 20, 2014
by
pady_1
1
answer
Regarding Oral Contraceptive pills: 1. Pills have to be taken daily for a period of 21 days starting preferably within the first five days of menstrual cycle. 2. After a gap of 7 days, it has to be repeated in the same pattern till contraconception is desired. 3. Menstruation occurs in between the 21 day course of tablet. Regarding 1,2 and 3:
aipmt
ch4
medium
class12
reproduction
biology
asked
Mar 20, 2014
by
pady_1
1
answer
Intra Uterine Devices (IUDs) - copper releasing IUDs: (i) increase phagocytosis of sperms within the uterus (ii) the Cu ions released suppress sperm motility (iii) the Cu ions released suppress the fertilising capacity of sperms Regarding (i), (ii) and (iii):
aipmt
ch4
medium
class12
reproduction
biology
asked
Mar 20, 2014
by
pady_1
1
answer
1. Mycoplasma are a group of fungus. 2. They are devoid of cell walls 3. They are highly pleomorphic, with fixed shape and size.
aipmt
ch8
medium
class11
cell structure and function
biology
asked
Mar 20, 2014
by
pady_1
1
answer
1. Bacteria show a range in the number and arrangement of flagella. 2. Bacterial flagellum is composed of three parts – filament, hook and basal body. 3. The filament is the longest portion and extends from the cell surface to the outside. Regarding 1,2 and 3:
aipmt
ch8
easy
class11
cell structure and function
biology
asked
Mar 20, 2014
by
pady_1
1
answer
Which of the following statements is true about Glycocalyx?
aipmt
ch8
medium
class11
cell structure and function
biology
botany
asked
Mar 20, 2014
by
pady_1
1
answer
1. Prokaryotes and unicellilar eukaryotes have something unique in the form of inclusions. 2. A specialised differentiated form of cell membrane called mesosome is the characteristic of prokaryotes. 3. They are essentially aggregations of cytoplasmic proteins. Regarding 1,2 and 3:
aipmt
ch8
medium
class11
cell structure and function
biology
asked
Mar 20, 2014
by
pady_1
1
answer
Prokaryotes: 1. Most prokaryotes do not have a cell wall. 2. The fluid matrix filling the cell is the cytoplasm. 3. There is no well-defined nucleus. 4. The genetic material is basically naked, not enveloped by a nuclear membrane. Regarding 1,2,3 and 4:
aipmt
ch8
medium
class11
cell structure and function
biology
asked
Mar 20, 2014
by
pady_1
1
answer
1. Prokaryotic cells are generally smaller 2. Thet multiply more rapidly than the eukaryotic cells. 3. They may vary greatly in shape and size. Regarding 1,2 and 3:
aipmt
ch8
medium
class11
cell structure and function
biology
asked
Mar 20, 2014
by
pady_1
1
answer
1. Human red blood cells are about 11.0 μm in diameter. 2. Nerve cells are some of the largest cells. 3. Cells also vary greatly in their shape; they may be disc-like, polygonal, columnar, cuboid, thread like, or even irregular. Regarding 1,2 and 3:
aipmt
ch8
difficult
class11
cell structure and function
biology
asked
Mar 20, 2014
by
pady_1
1
answer
1. Nucleus is a dense membrane bound structure. 2. Nucleus contains the chromosomes 3. Chromosomes in turn contain the genetic material, DNA. Regarding 1,2 and 3:
aipmt
ch8
easy
class11
cell structure and function
biology
asked
Mar 20, 2014
by
pady_1
1
answer
1. The onion cell is a typical plant cell 2. It has a distinct cell wall as its outer boundary 3. Cell wall is just within the cell membrane. 4. The cells of the human cheek have an outer membrane as the delimiting structure of the cell. Regarding 1,2,3 and 4:
aipmt
ch8
easy
class11
cell structure and function
biology
asked
Mar 20, 2014
by
pady_1
1
answer
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