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Posted by Vineet Rana (Jaat) 6 years, 9 months ago
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Meghna Thapar 5 years, 6 months ago
The chlorophyll plants contain chlorophyll a and b. Chlorophyll a - is the most ordinarily utilized photosynthetic color and retains blue, red and violet frequencies in the unmistakable range. It takes an interest primarily in oxygenic photosynthesis in which oxygen is the primary result of the process. Chlorophyll a is the most important photosynthetic pigment because it is directly involved in the conversion of light energy (photons) to chemical energy. ... All other photosynthetic pigments found in the chloroplasts of higher plants are called "accessory pigments".
Posted by Vineet Rana (Jaat) 6 years, 9 months ago
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Meghna Thapar 5 years, 6 months ago
Working of Human blood circulatory system takes place in the steps below:
(i) When the muscles of all the four chambers are relaxed, the pulmonary vein brings the oxygenated blood from the lungs in the left atrium of the heart.
(ii) When the left atrium contracts, the oxygenated blood is pushed into the left ventricle through valve V1.
(iii) When the left ventricle contracts, the oxygenated blood enters the main artery called aorta from which it goes to the different body organs through small branches called arterioles and capillaries.
(iv) The main artery carries the blood to all the organs of the body head, arms etc except the lungs. The oxygenated blood gives off oxygen, digested food and dissolved materials to the body cells. The carbon dioxide produced in the cells enters the blood. The deoxygenated blood enters main vein called vena cava which carried it to the right atrium of the heart.
(v) When the right atrium contracts, the deoxygenated blood enters right ventricle through valve V2.
(vi) When the right ventricle contracts, the deoxygenated blood enters the lungs through pulmonary artery and releases carbon dioxide and absorbs fresh oxygen from air. The blood becomes oxygenated again and is sent to the left atrium of heart by pulmonary vein for circulation in the body. This whole process is repeated continuously.
Posted by Vineet Rana (Jaat) 6 years, 9 months ago
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Meghna Thapar 5 years, 4 months ago
- The growth that results from cell division in the cambia or lateral meristems which causes the stems and roots to thicken is called secondary growth
- This type of growth occurs due to the activity of the two lateral meristems- the cork cambium and vascular cambium.
- Secondary growth in dicots:-
1) Formation of cambium ring:
- The cambium of vascualr bundles becomes meristematic.
- Some of the medullary ray cells lying at the level of cambium also become meristematic.
- It forms a strip of interfasciular cambium together with intrafasciular cambium to form a circular ring called cambium ring.
- This cambium ring forms secondary tissues in the stellar region.
- The vascular cambium consists of two types of cells- fusiform initials and ray initials.
- The fusiform initials are vertically oriented which divide to form the elements of xylem and phloem.
2) Formation of secondary vascular tissues:
- The cambium ring cuts off new cells, both on outer and inner sides,
- The new cells formed on the outer side modify into the elements of secondary phloem.
- The cells formed on the inner side modify into the secondary xylem.
3) Vascular rays:
- Ray initials of the cambium ring form narrow bands of parenchymatous cells.
- These cells extend radially from the pith to the phloem.
- These are called secondary medullary rays or vascular rays.
Posted by Yash Bhardwaj 6 years, 9 months ago
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Meghna Thapar 5 years, 6 months ago
Ligases are enzymes that are capable of catalyzing the reaction of joining two large molecules by establishing a new chemical bond, generally with concomitant hydrolysis of a small chemical group on one of the bulky molecules or simply linking of two compounds together. DNA ligase is the enzyme at the heart of the DNA ligation reaction. It covalently joins the phosphate backbone of DNA with blunt or compatible cohesive ends (see Figure 1) and it's natural role is in repairing double strand breaks in DNA molecules.
Posted by Yash Bhardwaj 6 years, 9 months ago
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Meghna Thapar 5 years, 6 months ago
Each acetyl coenzyme A proceeded once through the citric acid cycle. Therefore, in total, it created 6 NADH + H+ molecules, two FADH2 molecules, four carbon dioxide molecules, and two ATP molecules. The reverse TCA utilizes carbon dioxide and water to produce carbon molecules. There are three major enzymes that are unique to reverse TCA including ATP citrate lyase which converts citrate into oxaloacetate and acetyl CoA.
Posted by Yash Bhardwaj 6 years, 9 months ago
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Aashish Kumar 6 years, 9 months ago
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Meghna Thapar 5 years, 6 months ago
The chemical formula for hemoglobin is C2952 H4664 O832 N812 S8 Fe4. A normal level for men and women ranges from 12 to 20 grams per deciliter.
Posted by Yash Bhardwaj 6 years, 9 months ago
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Posted by Yash Bhardwaj 6 years, 9 months ago
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Meghna Thapar 5 years, 6 months ago
The fimbriae of the uterine tube, also known as fimbriae tubae, are small, fingerlike projections at the end of the fallopian tubes, through which eggs move from the ovaries to the uterus. The fimbriae are connected to the ovary. Fimbriae are used by bacteria to adhere to one another and to adhere to animal cells and some inanimate objects. A bacterium can have as many as 1,000 fimbriae. Fimbriae are only visible with the use of an electron microscope. They may be straight or flexible.
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Yogita Ingle 6 years, 9 months ago
Monocots show fibrous root system whereas dicots show tap root system.
Monocot leaves have parallel venation whereas dicot leaves have reticulate venation.
Monocots have a single cotyledon in their seeds whereas dicots show 2 cotyledons in their seeds.
The flowers of monocots are trimerous which means they have three or multiple of three petals. The flowers of dicots are pentamerous which means they possess five or multiple of five petals.
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Meghna Thapar 5 years, 6 months ago
A microscopic gap between a pair of adjacent neurons over which nerve impulses pass when going from one neuron to the next is called a synapse. Synapse between two neurons acts as a one way valve which allows electrical impulses to pass in one direction only. This happens as follows: When an electrical impulse coming from the receptor reaches the end of the axon of sensory neuron, then the electrical impulse releases tiny amount of a chemical substance called neuro transmitter substance into the synapse between two adjacent neurons. This substance crosses the synapse and starts a similar electrical impulse in the dendrite of the next neuron. In this way, the electrical impulses passes from one neuron to the next across the synapse.
Posted by Gaurav Manohar 6 years, 9 months ago
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Yogita Ingle 6 years, 9 months ago
The primary producers of the ocean are phytoplankton, that is at the base of the oceanic food web. Phytoplankton includes the diatoms and dino flagellates. Among the most abundant are the diatoms. They use the pigment chlorophyll to convert sunlight into food.
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Shakshi Rana 6 years, 9 months ago
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