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Meghna Thapar 5 years, 4 months ago
The primary *** organ in females and males are ovaries and testes that produces eggs and sperms respectively.
These *** organs also produces hormones such as progesterone, testosterone and estrogen. These hormones released in primary *** organs play a vital role in the functionality of secondary *** organs. For example: progesterone hormone released in ovaries helps to create a suitable environment in uterus ( a female secondary *** organ) for pregnancy.
Similarly, testosterone formed in testes helps in formation of sperms and their motility which pass through ***** (secondary *** organ) during intercourse.
Posted by Siddartha Laishram 6 years, 8 months ago
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Posted by Souromi Chatterjee 6 years, 8 months ago
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Yogita Ingle 6 years, 8 months ago
High temperature of the abdomen kills the spermatogenic tissue of the testes. Thus, no sperms are formed. Hence, failure of testes to descend into scrotal sacs leads to sterility.
Posted by Rajkamal Shakya 6 years, 8 months ago
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Yogita Ingle 6 years, 8 months ago
An asexually produced mass of cells, which are capable of developing into a new organism or into an adult freshwater sponge is termed as a Gemmule. They are small bud like cells, which are formed by sponges to withstand unfavorable environmental conditions. A freshwater sponge reproduces both by sexually and asexually.
Gemmules are usually found in a round or a ball-like structure, along with a central mass of amoeboid cells and a thick peripheral layer of a small siliceous spicule.
The structure of Gemmules includes Micropyle, Spicule, Inner layer, Archaeocytes and an Outer pneumatic layer. The micropyle is an outer coat of a cell with a minute opening and the peripheral layer is made up of a thick pneumatic layer and air chambers, which helps gemmules to float in water bodies. The Archaeocytes are reproductive cells and the spicule is the sharp-pointed structure, which is involved in protecting the gemmules from <a href="https://byjus.com/biology/predator/">predators</a> and also provide structural support to the gemmules.
Posted by Krishna Yadav 6 years, 8 months ago
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Yogita Ingle 6 years, 8 months ago
In the flowers of Ophrys
(i) One petal resembles the female of a bee species in size, colour, markings, etc.
(ii) Male bee perceives it as a female and pseudocopulates with it.
(iii)During the process, the pollen grains from the anthers become dusted on the body of the bee.
(iv)When the bee is attracted to another flower of this orchid species, the process is repeated and the pollen grains from the body of the bee get dusted on the stigma thus, pollination is achieved.
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Yogita Ingle 6 years, 8 months ago
Point mutation is a change in a single base pair of DNA by substitution, deletion, or insertion of a single nitrogenous base. An example of point mutation is sickle cell anaemia. It involves mutation in a single base pair in the beta-globin chain of haemoglobin pigment of the blood. Glutamic acid in short arm of chromosome II gets replaced with valine at the sixth position.
Posted by Jyotsna Chakraborty 6 years, 8 months ago
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Souromi Chatterjee 6 years, 8 months ago
Posted by Souromi Chatterjee 6 years, 8 months ago
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Yogita Ingle 6 years, 8 months ago
'Saheli' is a new oral contraceptive pill or oral contraceptive method used by the females, it contains a non- steroidal preparation and found to be very effective as emergency contraceptives as they could be used to avoid possible pregnancy due to casual unprotected intercourse or rape. This pill have to be taken 'once a week' it has very few side effects and high contraceptive value. 'Saheli'- pill was developed by scientists at Central Drug Research Institute (CDRI) in Lucknow, India.
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Yogita Ingle 6 years, 8 months ago
RNA is more reactive than DNA because :
(i) It is single stranded
(ii) OH- group is present in every nucleotide
(iii) It mutates faster.
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Zee Saleem ?✌️ 6 years, 8 months ago
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Yogita Ingle 6 years, 8 months ago
Water hyacinth is an exotic aquatic shrub species . It was imported to India during British rule by the european for its beautiful look due to its beautiful flowers and shape of leaves. But as an allein species it became a grave threat to native aquatic species . It competed with them and eliminated them from their environment. It spreaded with an alaraming rate throughout the water body. It also reduced the availability of dissolved oxygen in the water body required to support aquatic lives . So there was also reduction in fish population in the water hyacinth grown water body. As it was first introduced in west Bengal and its effect was seen there it is called as terror of Bengal.
Posted by Adrija Akhuli 6 years, 8 months ago
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Meghna Thapar 5 years, 4 months ago
After ovulation – when the egg is released from the follicle – there is a period of between 12 and 48 hours when the egg is available to be fertilised by a mature sperm.
Sperm can last for up to five days inside a woman’s body, sustained by the cervical mucus – so often, just after ovulation, sperm already waiting in the fallopian tubes will fertilise the egg after it has just been released.
Healthy, active sperm take around six hours after ejaculation to swim through the cervix and the womb into the fallopian tube to meet a waiting egg, so for one to two days after ovulation, it is still possible to fall pregnant.
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