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Recent questions tagged biology
Questions
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
biology
asked
Jan 6, 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
biology
asked
Jan 6, 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
biology
asked
Jan 6, 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
biology
asked
Jan 6, 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
biology
asked
Jan 6, 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
biology
asked
Jan 6, 2014
by
pady_1
1
answer
1. The alveoli open into mammary tubules. 2. The tubules of each lobe join to form a lactiferous duct. 3. Several lactiferous ducts join to form a wider mammary ampulla 4. Mammary ampulla is connected to mammary duct. Regarding 1,2,3 and 4 :
aipmt
ch3
medium
class12
biology
asked
Jan 6, 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
biology
asked
Jan 6, 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
biology
asked
Jan 6, 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
biology
asked
Jan 6, 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
biology
asked
Jan 6, 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
biology
asked
Jan 6, 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
biology
asked
Jan 6, 2014
by
pady_1
2
answers
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
biology
asked
Jan 6, 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 cells provide nutrition to the germ cells. Regarding 1,2 and 3 :
aipmt
ch3
easy
class12
biology
asked
Jan 6, 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
biology
asked
Jan 6, 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
biology
asked
Jan 6, 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
biology
asked
Jan 6, 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
biology
asked
Jan 6, 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
biology
asked
Jan 6, 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
biology
asked
Jan 6, 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
biology
asked
Jan 6, 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
biology
asked
Jan 6, 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
biology
asked
Jan 6, 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
biology
asked
Jan 6, 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
biology
asked
Jan 6, 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
biology
asked
Jan 6, 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
biology
asked
Jan 6, 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
biology
asked
Jan 6, 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
biology
asked
Jan 6, 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
biology
asked
Jan 6, 2014
by
pady_1
1
answer
Glycocalyx :- 1. It is of same composition and thickness among different bacteria though it may differ whethe tightly or loosely attached. 2. It could be a loose sheath called the capsule in some 3. While in others it may be tightly bound and tough, called the slime layer. Regarding 1,2 and 3:
aipmt
ch8
medium
class11
biology
asked
Jan 6, 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
biology
asked
Jan 6, 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
biology
asked
Jan 6, 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
biology
asked
Jan 6, 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
biology
asked
Jan 6, 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
biology
asked
Jan 6, 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
biology
asked
Jan 6, 2014
by
pady_1
1
answer
CELL THEORY : 1. Rudolf Virchow first explained that cells divided 2. He explained that new cells are formed from pre-existing cells (Omnis cellula-e cellula). 3. He modified the hypothesis of Schleiden and Schwann to give the cell theory a final shape. Regarding 1,2 and 3:
aipmt
ch8
easy
class11
biology
asked
Jan 6, 2014
by
pady_1
1
answer
CELL THEORY : 1. Matthias Schleiden, a German botanist observed that all plants are composed of different kinds of cells which form the tissues of the plant. 2. Theodore Schwann (1839), a British Zoologist, studied different types of animal cells and reported that cells had a thin outer layer (‘plasma membrane’). 3. Theodore Schwann also concluded that the presence of cell wall is a unique character of the plant cells. 4. Schwann proposed the hypothesis that the bodies of animals and plants are composed of cells and products of cells. Regarding 1,2,3 and 4:
aipmt
ch8
medium
class11
biology
asked
Jan 6, 2014
by
pady_1
1
answer
Regarding G.N. RAMACHANDRAN: 1. He was the founder of the ‘Madras school’ of conformational analysis of biopolymers. 2. His discovery of the triple helical structure of collagen published in Nature in 1954 3. His analysis of the allowed conformations of proteins through the use of the ‘Ramachandran plot’ rank among the most outstanding contributions in structural biology. Regarding 1,2 and 3:
aipmt
ch8
medium
class11
biology
asked
Jan 6, 2014
by
pady_1
1
answer
Class – Mammalia : 1. Sexes are separate 2. Fertilisation is internal. 3. They are always viviparous 4. Development is direct. Regarding 1,2,3 and 4:
aipmt
ch4
medium
class11
biology
asked
Jan 6, 2014
by
pady_1
1
answer
Class – Mammalia : 1. Heart is four- chambered. 2. Respiration is by lungs. 3. They are poikilothermous. Regarding 1,2 and 3:
aipmt
ch4
easy
class11
biology
asked
Jan 6, 2014
by
pady_1
1
answer
Class – Mammalia : 1. The skin of mammals is unique in possessing hair. 2. External ears or pinnae are absent in most species. 3. Different types of teeth are present in the jaw. Regarding 1,2 and 3:
aipmt
ch4
medium
class11
biology
asked
Jan 6, 2014
by
pady_1
1
answer
Class – Aves : 1. Sexes are separate. 2. Fertilisation is external. 3. They are oviparous 4. Development is direct. Regarding 1,2,3 and 4:
aipmt
ch4
easy
class11
biology
asked
Jan 6, 2014
by
pady_1
1
answer
Class – Aves : 1. Heart is completely four- chambered. 2. Respiration is by lungs. 3. Air sacs connected to lungs supplement respiration. Regarding 1,2 and 3:
aipmt
ch4
medium
class11
biology
asked
Jan 6, 2014
by
pady_1
1
answer
Class – Aves : 1. The characteristic features of Aves are the presence of feathers 2. Most of them can fly 3.Ostrich is one of the flightless birds. Regarding 1,2 and 3:
aipmt
ch4
easy
class11
biology
asked
Jan 6, 2014
by
pady_1
1
answer
Class – Reptilia : 1. Sexes are separate. 2. Fertilisation is internal. 3. They are oviparous 4. Development is direct. Regarding 1,2,3 and 4:
aipmt
ch4
medium
class11
biology
asked
Jan 6, 2014
by
pady_1
1
answer
Class – Amphibia : 1. Sexes are separate. 2. Fertilisation is external. 3. They are viviparous 4. Development is direct. Regarding 1,2,3 and 4:
aipmt
ch4
medium
class11
biology
zoology
asked
Jan 6, 2014
by
pady_1
1
answer
Class – Amphibia : 1. Alimentary canal, urinary and reproductive tracts open into a common chamber called cloaca 2. Cloaca opens to the exterior. 3. These are cold-blooded animals. Regarding 1,2 and 3:
aipmt
ch4
medium
class11
biology
asked
Jan 6, 2014
by
pady_1
1
answer
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