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Yogita Ingle 6 years, 3 months ago
| Properties | Euchromatin | Heterochromatin |
| Form | A loosely packed form of DNA | A tightly packed form of DNA |
| Heteropycnosis | Does not exhibit | Exhibits |
| DNA density | Low | High |
| Found | Prokaryotes as well as eukaryotes | Eukaryotes only |
| State | Active | Inactive |
| Replication | Early replicative | Late replicative |
| Sticky/Non-sticky | Regions are not sticky | Sticky regions |
| Presence | Inner body of the nucleus | The periphery of the nucleus |
| Activity | No or little transcriptional activity | Participate in the transcriptional activity |
Posted by Khushi Rai 6 years, 4 months ago
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Amit Rao 6 years, 4 months ago
Posted by Shakir Mzn 6 years, 4 months ago
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Yogita Ingle 6 years, 4 months ago
|
Zoospore |
Zygote |
|
|
1. |
A zoospore is a motile asexual spore that utilizes the flagella for movement. |
A zygote is a non-motile diploid cell formed as a result of fertilization. |
|
2. |
It is an asexual reproductive structure. |
It is formed as a result of sexual reproduction. |
Posted by Khan Kaif 6 years, 4 months ago
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Shivani Sagare 6 years, 4 months ago
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Sneh Deswal 6 years, 4 months ago
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Himanshi Guleria 6 years, 4 months ago
Posted by Akash Tiwari 6 years, 4 months ago
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Jd Chouhan 6 years, 4 months ago
Yogita Ingle 6 years, 4 months ago
Municipal sewage treatment involves the following steps:
1. Primary treatment/Physical treatment: It involves the removal of large and small particles from sewage. The floating debris is first removed by sequential filtration through wire mesh screens. Then, soil and smaller particles are removed by sedimentation in the settling tank. The sediment is called primary sludge and the supernatant is called effluent. The effluent is then sent for secondary treatment.
2. Secondary treatment/Biological treatment: Primary effluent is passed through large aeration tanks with constant mechanical agitation and air supply. Useful aerobic microbes grow rapidly and form flocs. The growing microbes consume organic matter and thereby, reduce the BOD of the effluent. After this, the effluent is passed into the settling tank. The bacterial flocs settle down and the sediment is now called activated sludge. A small part of the sludge is used as an inoculum in the aeration tank and the remaining part is passed into large tanks called anaerobic sludge digestors. In the digestors, heterotrophic microbes anaerobically digest bacteria and fungi in the sludge producing a mixture of gases such as methane, hydrogen sulphide and CO2 which form biogas.
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Yogita Ingle 6 years, 4 months ago
The word hysteresis means lagging behind. The phenomenon of lagging of intensity of magnetisation (M) behind magnetic intensity (H), when a specimen of magnetic material is subjected to a cycle of magnetization is called hysteresis
Posted by Saurabh Biswas 6 years, 4 months ago
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Aniket Panwar 6 years, 4 months ago
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Sia ? 6 years, 4 months ago
The difference between spermiogenesis and spermiation is
- In spermiogenesis spermatids are formed, while in spermiation spermatozoa are formed.
- In spermiogenesis spermatozoa are formed, while in spermiation spermatids are formed.
- In spermiogenesis spermatozoa are formed, while in spermiation spermatozoa are released from sertoli cells into the cavity of seminiferous tubules.
- In spermiogenesis spermatozoa from sertoli cells are released into the cavity of seminiferous tubules, while in spermiation spermatozoa are formed.
Posted by Parul Yadav 6 years, 4 months ago
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Aryan Maurya 6 years, 4 months ago
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Yogita Ingle 6 years, 4 months ago
| Self-Pollination | Cross-Pollination |
| Transfer pollen grains from the anther to the stigma of the same flower. | Transfer pollen grains from the anther to the stigma of the different flower. |
| This process can take place either in the same flower or another flower of the same plant. | This process can take place between two flowers on different plants. |
| It occurs in the flowers which are genetically same. | It occurs between flowers which are genetically different. |
| Occurs only in perfect flowers. | Occurs both in perfect or imperfect flowers. |
| Causes homogenous conditions in progenies. | Causes heterozygous condition in progenies. |
| Self-pollination increases genetic uniformity and decreases genetic variation. | Cross-pollination decreases genetic uniformity and increases genetic variation. |
| Causes inbreeding. | Causes outbreeding. |
| Reduces the gene pool. | Maintains the gene pool. |
| Produces limited amounts of pollen grains. | Produces large amounts of pollen grains. |
| In self-pollination, both the stigma and anther mature at the same time. | In cross-pollination, both the stigma and anther mature at the different time. |
| Transfers few numbers of pollen. | Transfers large numbers of pollen. |
Posted by Ankit Panchal 6 years, 4 months ago
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Sneh Deswal 6 years, 4 months ago
Vikash Kumar Patel 6 years, 4 months ago
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Sneh Deswal 6 years, 4 months ago
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Posted by Mohit Yadav 6 years, 4 months ago
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Sia ? 6 years, 4 months ago
Endonucleases are enzymes that cleave the phosphodiester bond within a polynucleotide chain.
Posted by Mohd Mohsin Raza 6 years, 4 months ago
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Yogita Ingle 6 years, 4 months ago
The vegetative or asexual propagation is that process where a new individual plant originates from another (parent) plant’s vegetative part (stem, root or leaf) as the former would resemble the latter in terms of their characteristics. Here we will be discussing the natural ways of vegetative propagation:
Vegetative propagation by roots
In this case, adventitious buds are formed by certain plant roots like poplars, guava, murraya, shisham etc. Necessary food quantities are present in certain tuberous adventitious roots despite having adventitious buds like sweet potato and Dahlia. Given the proper conditions, these buds sprout well, provided they are planted after separation. In the case of plants like shisham, new roots that grow fast would rise from the stump cuts.
Vegetative propagation by stems
Here, the newly formed branches are isolated by the older parts that undergo decay. The former hence has an individual life.The decay of older parts isolates the newly formed branches. The latter henceforth lead an independent life. Certain corms like freesia, colocasia, crocus etc have ample food stored while being able to produce buds that are adventitious. Bulbs like Narcissus, Garlic and Onion are able to bear further bulbs
(i) Stem tuber:
These are found in items like Artichoke and Potato. Stem tubers are found in Potato and Artichoke. The potato tuber is that part of an underground stem branch that is swollen apically that could bear plenty of eyes or node. Every eye could bear further buds. More plants are formed from the eyes with buds.
(ii) Runner:
Stems that are aerially weak like doob grass, oxalis and so on once in contact with ground produces adventitious roots at nodes. Once the old parts of the plant decay, the branches split to gain individual existence.
Vegetative propagation by leaf
Certain plants are able to bud adventitiously on leaves like streptocarpus, saintpaulia, bryophyllum and so on. While the leaf is attached to the plant, the buds are in the dormant state. But once the leaves are in contact with moist soil, new plantlets with margins are formed. There are certain species of bryophyllum which could form plants from intact leaves margin.
Posted by Seema Bala 6 years, 4 months ago
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Akash Tiwari 6 years, 4 months ago
1Thank You