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Ask QuestionPosted by Dj Rocker 7 years ago
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Posted by Ashwini Kumar 7 years ago
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Sivan Karthick 7 years ago
Posted by Rashu Rashu 7 years ago
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Yogita Ingle 7 years ago
Organ of Corti is a structure located on the basilar membrane of inner ear, which contains hair cells that act as auditory receptors. The organ of Corti is located in the scala media of the cochlea of the inner ear between the vestibular duct and the tympanic duct and is composed of mechanosensory cells, known as hair cell.
Posted by Sanjay Chaudhary 7 years ago
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Yogita Ingle 7 years ago
| Light reaction | Dark reaction |
| Requires presence of light | Does not require presence of light |
| Occurs in thylakoid membranes of grana and stroma lamellae | Occurs in stroma of chloroplasts |
| Involves absorption of light energy and its conversion into chemical energy in the form of ATP and NADPH + H+ | Utilises ATP and NADPH2 for the fixation and reduction of CO2 to form carbohydrates. |
| Also called photochemical reaction or Hill reaction. | Also called biosynthetic phase or Blackman’s reaction or carbon dioxide fixation or Calvin cycle. |
Posted by Abhijit Saikhom 7 years ago
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Yogita Ingle 7 years ago
The theory for the ascent of sap is known as the cohesion-tension-transpiration pull theory. It has two main points-
1.The water molecules are attracted to each other due to cohesion which forms a continuous channel. Water molecules are also attracted by xylem elements due to adhesion. So cohesive and adhesive forces are responsible to form a continuous channel between roots and the leaves.
2.Due to loss of water by transpiration, the pulling force(transpiration pull) is developed that causes water to move in the upward direction.
Posted by Sivan Karthick 7 years ago
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Posted by Kritika Suryawanshi 7 years ago
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Yogita Ingle 7 years ago
- Living beings is that it do not require use of oxygen to get get energy from food. It also happens in our body some time when there is lack of oxygen in us. ( Very Rarely !) and also it produce only 2 ATP.
- Another advantage of anaerobic respiration is its speed. It produces ATP very quickly. For example, it lets your muscles get the energy they need for short bursts of intense activity (see Figure below). Aerobic respiration, on the other hand, produces ATP more slowly.
Posted by Imran Ahmed 7 years ago
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Sivan Karthick 7 years ago
Posted by Om Patel 7 years ago
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Gaurav Seth 7 years ago
Sphincter muscle are circular muscle which have ability to contract and relax over a body opening to maintain the closure and opening of that particular opening in the body. Example: Sphincter muscles present on the **** regulates the opening and closure of ****.
Posted by Anas Chaudhary 7 years ago
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Tanya Chaudhary 7 years ago
Posted by Priya Meshram 7 years ago
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Tanya Chaudhary 7 years ago
Posted by Ishita Ishita 7 years ago
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Saba Elias 7 years ago
Posted by Ishita Ishita 7 years ago
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Gaurav Seth 7 years ago
Guttation is the process of secreting water droplets from the pores of some vascular plants like grass. Guttation is often confused with dew droplets that condense from the atmosphere on to the plants surface.
Posted by Ishita Ishita 7 years ago
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Ananta Gorai 7 years ago
Yogita Ingle 7 years ago
Necrosis is a cellular process of death occurring when the cells are highly exposed to extreme external conditions . It is caused by external agents such as infection, trauma, toxins. The organelles are not functional after the death of cell. It is always damaging or harmful. It is caused by Bacterial and fungal infections, mycobacterial infections, denatured proteins, pancreatitis, or by the deposits of antibodies and antigens .
Posted by Ishita Ishita 7 years ago
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Yogita Ingle 7 years ago
Kranz anatomy is the special arrangement of the cells found in the C4 plants.
The characteristics of Kranz anatomy are:
- The bundle sheath cells form several layers around the vascular bundles.
- Mesophyll cells are undifferentiated and arranged in concentric layers around the vascular bundles.
Posted by Ishita Ishita 7 years ago
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Posted by Ishita Ishita 7 years ago
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Yogita Ingle 7 years ago
Peat is obtained from species of Sphagnum which is a moss. Peat has been in use as fuel. Peat is also used as packing material for shipment of living materials; because peat has good capacity to hold water.
Posted by Ishita Ishita 7 years ago
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Yogita Ingle 7 years ago
Heterocysts are specialized nitrogen-fixing cells formed during nitrogen starvation by some filamentous cyanobacteria, such as Nostoc punctiforme, Cylindrospermum stagnale, and Anabaena sphaerica. Heterocysts is present in some cyanobacteria. It is a large-sized, pale coloured, thick walled cell which occur in terminal, intercalary or lateral position in filamentous cyanobacteria, e.g., Nostoc.
Posted by Priya Meshram 7 years ago
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Yogita Ingle 7 years ago
Periderm is composed of the phellogen, phellem, and phelloderm.
During secondary growth, the outer epidermal layer and the cortical layer are broken because of the cambium. To replace them, the cells of the cortex turn meristematic, giving rise to cork cambium or phellogen. It is composed of thin-walled, narrow and rectangular cells.
Posted by Tanya Chaudhary 7 years ago
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Yogita Ingle 7 years ago
Differentiation: The cells derived from root apical meristem (RAM) and shoot apical meristem (SAM) and cambium differentiate, mature to perform specific functions. This act leading to maturation is termed differentiation. They, undergo a few or major structural changes both in their cell walls and protoplasm.
Dedifferentiation: In plants, the living differentiated cells can regain the capacity to divide mitotically under certain conditions. The sum of events, that bestow this capacity to divide once again, are termed dedifferentiation. A dedifferentiated tissue can act as meristem (e.g., interfascicular vascular cambium, wound meristem, cork cambium).
Redifferentiation: The product of dedifferentiated cells/tissue which lose the ability to divide are called redifferentiate cells/tissues and the event, redifferentiation. However, the growth in plants is open, and even differentiation in plants is open, because, e.g., the same apical meristem cells give rise to xylem phloem, fibres, etc., cells/tissues arising out of same meristem have different structures at maturity. The final structure at maturity of a cell/ tissue arising out of same meristem is determined by the location of the cell within.
Posted by Arun Venkateshwaran 7 years ago
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Yogita Ingle 7 years ago
- Chemiosmotic hypothesis explain the mechanism of ATP synthesis in chloroplast.
- In photosynthesis, ATP synthesis is linked to development of a proton gradient across a membrane.
- The protons that are produced by the splitting of water are accumulated inside of membrane of thylakoids (in lumen).
- As the electron moves through the photosystem, protons are transported across the membrane.
- NADP reductase enzyme is located on the stroma side of the membrane, along with electrons from the acceptor it removes H+ from the stroma during reduction of NADPH + H+.
- This creates proton gradients across the thylakoid membrane as well as a measurable decrease in pH in the lumen.
- ATPase has a channel that allows diffusion of protons back to stroma across the membrane.
- This releases energy to activate ATPase enzyme that catalyses the formation of ATP.
Posted by Rinki Kumari 7 years ago
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Sivan Karthick 7 years ago
Yogita Ingle 7 years ago
| Guttation | Transpiration |
| Occurs during night time. | Occurs during daylight. |
| Water lost in guttation is rich in minerals. | The transpired water is pure. |
| Water is lost as the liquid. | Water is lost in the form of vapors. |
| The process takes place through hydathodes. | Stomata perform this process. |
| Guttation is an uncontrolled phenomenon. | Transpiration is a controlled and regulated phenomenon. |
Tanya Chaudhary 7 years ago
Posted by Gauransh Baranwal 7 years ago
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Yogita Ingle 7 years ago
Quantitative genetic analyses of basal metabolic rate (BMR) can inform us about the evolvability of the trait by providing estimates of heritability, and also of genetic correlations with other traits that may constrain the ability of BMR to respond to selection.
Posted by Purnima Maurya 7 years ago
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Saba Elias 7 years ago
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