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Ask QuestionPosted by Sajid Najma 5 years, 4 months ago
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Mr. Singh 5 years, 4 months ago
Yogita Ingle 5 years, 4 months ago
Reproduction is defined as a biological process in which every living organism give rise to new organisms similar to themselves.
Basic features of reproduction:
(i) Replication of DNA
(ii) Cell division (only mitotic, or both mitotic and meiotic)
(iii) Formation of reproductive bodies or units.
(iv) Development of reproductive bodies into offsprings.
Posted by Susma Chettri 5 years, 4 months ago
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Posted by Anju Kumari 5 years, 4 months ago
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Yogita Ingle 5 years, 4 months ago
(1) Plants produced by vegetative propagation are genetically similar and constitute a uniform population called as clone.
(2) Plants that have reduced power of sexual reproduction, long dormant period of seed, poor viability can be multiplied by vegetative methods.
(3) Some fruit trees like banana, pineapple that do not produce viable seeds and dub grass which produces small quantity of seeds can be propagated by vegetative methods.
(4) It is a rapid and easier method of propagation.
(5) Good characters can be preserved by vegetative propagation.
(6) Vegetative Propagation can be used to develop Virus Free plants.
Posted by Rohit Krishna 5 years, 4 months ago
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Somesh Shriwas 5 years, 4 months ago
Posted by Omkar Mishra 5 years, 4 months ago
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Smruti Bej 5 years, 4 months ago
Posted by Subham Sahu 5 years, 4 months ago
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? ? 5 years, 4 months ago
Meghna Thapar 5 years, 4 months ago
In general, ectoderm develops into parts of the skin, the brain and the nervous system. Mesoderm gives rise to bones, muscles, the heart and circulatory system, and internal *** organs. Endoderm turns into the inner lining of some systems, and some organs such as the liver and pancreas.
Posted by Venkadesh G 5 years, 4 months ago
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Yogita Ingle 5 years, 4 months ago
Transcription in prokaryotes:
- Initiation: In this step RNA polymerase enzyme along with initiation factor (sigma) binds with DNA sequence at promotor and starts transcription.
- Elongation: In this step RNA polymerase enzyme nucleoside triphosphate act as a substrates and polymerises the nucleotides of templates as a complementary strand.
- Termination: In this step terminator factor (rho) replaces the initiation factor at the termination point of DNA sequence.At this stage detachment of RNA and RNA polymerase enzyme with rho factor takes place.
In eukaryotes, transcription occrurs in nucleus whereas in prokaryotes it occurs in cytoplasm.
In eukaryotes RNA processing is required as its structural gene is monocistronic whereas in prokaryotes it does not require because its structural gene is polycistronic.
Posted by Monalisa Dash 5 years, 4 months ago
- 2 answers
Meghna Thapar 5 years, 4 months ago
Flowering plants (also called Angiosperms or Magnoliophyta) are the dominant land plants today. Together with the gymnosperms they make up the seed plants. They are different from the gymnosperms because angiosperms bear flowers, and have enclosed ovules. Gymnosperms bear naked seeds on cones or open structures. Examples - daisies, geraniums and tulips.
Posted by Janvi Dahre 5 years, 4 months ago
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Smruti Bej 5 years, 4 months ago
Posted by Lobsang Panden 5 years, 4 months ago
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Meghna Thapar 5 years, 3 months ago
A gene is the basic physical and functional unit of heredity. Genes are made up of DNA. Alleles are forms of the same gene with small differences in their sequence of DNA bases. These small differences contribute to each person's unique physical features. Scientists keep track of genes by giving them unique names. Gene is a unit of DNA that is usually located on a chromosome and that controls the development of one or more traits and is the basic unit by which genetic information is passed from parent to offspring.
Posted by Yoganshu . 5 years, 4 months ago
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Posted by Tanmay Jena 5 years, 4 months ago
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? ? 5 years, 4 months ago
Posted by Durga Kumari 5 years, 4 months ago
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Meghna Thapar 5 years, 4 months ago
Boveri and Sutton's chromosome theory of inheritance states that genes are found at specific locations on chromosomes, and that the behavior of chromosomes during meiosis can explain Mendel's laws of inheritance. Theodor Boveri and Walter Sutton are the scientists credited with an extension of Mendel's laws, known as the chromosome theory of inheritance. In essence, this theory, which was developed in the early 1900s, explains what Mendel observed in his pea plants, otherwise known as the Boveri and Sutton chromosome theory.
Posted by Rohit Krishna 5 years, 4 months ago
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Yogita Ingle 5 years, 4 months ago
Geitonogamy is the type of pollination where the flower is pollinated by another flower of the same plant. As the genetic material is the same therefore there is no cross-pollination and this is also known as genetic autonomy. This results in inbreeding depression because there is no variation.
Cross-pollination involves the transfer of pollen grains from the flower of one plant to the stigma of the flower of another plant is known as xenogamy.
Posted by Vinod Patel 5 years, 4 months ago
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Posted by Rohit Krishna 5 years, 4 months ago
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Posted by Nihira Nihira 5 years, 4 months ago
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Posted by Siddharth Shukla 5 years, 4 months ago
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Rohit Krishna 5 years, 4 months ago
Posted by Anitha Mani 5 years, 4 months ago
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Punam Gajghatem 5 years, 4 months ago
Posted by Prabhanshu Nema 5 years, 4 months ago
- 3 answers
Babli Nim 5 years, 4 months ago
Babli Nim 5 years, 4 months ago
Yogita Ingle 5 years, 4 months ago
An allele is a specific form of a gene. Genes are responsible for the expression of traits. Alleles are responsible for the variations in which a given trait can be expressed.
Posted by Abhinav Singh 5 years, 4 months ago
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Babli Nim 5 years, 4 months ago
Posted by Aman Gupta 5 years, 4 months ago
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Rinku Sheoran 5 years, 4 months ago
Gaurav Seth 5 years, 4 months ago
The coleorhiza is a protective sheath that envelops the radicle in certain plants that is penetrated by the root in germination. It helps in protecting the radicle.
Posted by Sachin Talawar 5 years, 4 months ago
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Yogita Ingle 5 years, 4 months ago
Foetal ejection reflex encompasses the mild uterine contractions in response to the signals that originate from the fully developed foetus and the placenta. This triggers release of oxytocin from maternal pituitary. Oxytocin acts on the uterine muscle and causes stronger contractions, which in turn stimulates further secretion of oxytocin. The stimulatory reflex between the uterine contraction and oxytocin secretion continuesresulting in stronger and stronger contractions leading to the expulsion of baby out of uterus through birth canal.
Posted by Anupama Singha 5 years, 4 months ago
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Pawni Chaudhary 5 years, 4 months ago
Aman Gupta 5 years, 4 months ago
Yogita Ingle 5 years, 4 months ago
Ovulation is one part of the female menstrual cycle whereby a mature ovarian follicle (part of the ovary) discharges an egg. In normal healthy female, it takes place on the 14th day of menstrual cycle.
Posted by Kamlesh Kumar 5 years, 4 months ago
- 2 answers
Yogita Ingle 5 years, 4 months ago
Vallisneria being a water pollinated species protect their pollen grains by having a mucilaginous coat. The coat prevents the pollen grains from getting wet.
Posted by Rupal Rao 5 years, 4 months ago
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Prabhanshu Nema 5 years, 4 months ago
Siddhesh Raut 5 years, 4 months ago
Yogita Ingle 5 years, 4 months ago
- The average life expectancy of dogs is around 10 to 13 years
- The average life expectancy of cats is around 12 to 14 years
Posted by Anupama Singha 5 years, 4 months ago
- 2 answers
Ayushee Arora 5 years, 4 months ago
Yogita Ingle 5 years, 4 months ago
- The average duration of human pregnancy is about 9 months called as the gestation period.
- Vigorous contraction of the uterus atthe end of pregnancy causes expulsion/delivery of the fetuscalled as parturition.
Posted by Rohit Krishna 5 years, 4 months ago
- 1 answers
Yogita Ingle 5 years, 4 months ago
- Since, one complete turn of the double helix has 10 base pairs, 6 coils of DNA will have 10x6= 60 base pairs.
DNA has four bases; two purines and two pyrimidines; purines are namely adenine and guanine and the pyrimidines are cytosine, thymine. Adenine in one DNA strand makes two hydrogen bonds with thymine in other DNA strand and guanine makes three hydrogen bonds with cytosine.
- According to Chargaff’s rule, in all cellular DNAs, regardless of the species, the number of adenosine residues is equal to the number of thymidine residues which means that A = T; and the number of guanosine residues is equal to the number of cytidine residues; G = C.
- According to the question, there are 22 base pairs with two hydrogen bonds which mean that out of total 60 base pairs in that DNA segment, the number of A-T pairs is 22; the number of adenine = 22 and the number of thymine = 22; A+T = 44, which makes options A and C wrong.
Thus, number of G-C pairs = 60-22 = 38; number of guanine = 38 and number of cytosine = 38; option B is correct.
Posted by Pritimayee Nanda 5 years, 4 months ago
- 0 answers
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Raksha Tiwari 5 years, 4 months ago
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