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Posted by Shyam Sharma 7 years, 4 months ago
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Yogita Ingle 7 years, 4 months ago
| Prokaryotes | Eukaryotes |
| Always unicellular and the size lies in between 0.2- 2.0 micrometers in diameter | Mostly multi-cellular and the size lies in between 10 – 100 mm in diameter |
| Cell wall usually present; chemically complex in nature | When Cell wall present, chemically simple in nature |
| Nucleus is absent | Nucleus is present |
| These cells consist of ribosomes which are smaller in size and circular in shape when compared to the cells of eukaryotes. | The ribosomes of eukaryotes are larger in size and are linear in shape. |
| DNA arrangement Circular in shape | DNA arrangement Linear in shape |
| Mitochondria is absent | Mitochondria is present |
| The cytoplasm in prokaryotes does not contain the endoplasmic reticulum | In this, the cytoplasm has the endoplasmic reticulum |
| Plasmids Present in prokaryotes | PlasmidsVery rarely found in eukaryotes |
| small ribosomes. | large ribosomes. |
| In this, the lysosome, mesosome, and centrosome is absent | Mesosome, Lysosomes, and centrosomes are usually present in Eukaryotes |
Posted by Ritika Sinha 7 years, 4 months ago
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Yogita Ingle 7 years, 4 months ago
Dicot leaf :
(i) It is dorsoventral leaf.
(ii) Stomata found only on lower epidermis.
(iii) Reticulate leaf vena¬tion.
(iv) Mesophyll is differ-entiated into spongy and palisade tissues. e.g., Dicot plants.
Monocot leaf :
(i) It is isobilateral leaf.
(ii) Stomata found both on lower and upper epidermis.
(iii) Parallel leaf venation.
(iv) Mesophyll not divided into spongy and palisade tissues, e.g., Monocot plants.
Posted by Ritika Sinha 7 years, 4 months ago
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Meghna Thapar 5 years, 4 months ago
- The first cork cambium is formed by the dedifferentiation of the outer part of the cortex.
- As the stem increases in girth, the epidermis and the cortex are replaced by another meristematic tissue called the cork cambium.
- It is also called phellogen.
- The cells of the phellogen are thin-walled, rectangular and narrow.
- The cork cambium is 2–3 layers thick.
- Cells of the cork cambium cuts off cells peripherally and towards the centre.
- Cells on the peripheral region form the cork cambium or phellem.
- The walls of cork cells have depositions of suberin because of which cork becomes impermeable to water.
- Cells on the inner region form the secondary cortex or phelloderm. The cells of this region are parenchymatous.
Posted by Yash Barnwal 7 years, 4 months ago
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Vishal Paswan 7 years, 4 months ago
Posted by Amaan Khan 7 years, 4 months ago
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Yogita Ingle 7 years, 4 months ago
Dorsal is the backside and ventral is front side of the leaf. Side of the leaf facing towards the sunlight, have more chlorophyll content and hence more green in color, is the ventral side of leaf while side which is facing toward the soil is dorsal side of the leaf.
Posted by Rishi Man 7 years, 4 months ago
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Posted by Lavudya Bhadkar 7 years, 4 months ago
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Meghna Thapar 5 years, 4 months ago
Pigeonpea is predominantly a crop of tropical areas mainly cultivated in semi-arid regions of India. Pigeonpea can be grown between 14°N and 28°N latitude, with a temperature ranging from 26° to 30°C in the rainy season (June to October) and 17° to 22°C in the postrainy (November to March) season. It has deep tap roots hence it can tolerate drought and poor soil conditions. Edible parts of pigeon pea are the seeds, seedpods, leaves, and young shoots. Pigeon pea is as well known for its medicinal uses. Leaves are used as treatment of coughs, bronchitis, diarrhoea, haemorrhages, sores, and wounds.
Posted by Priyaa Ld 7 years, 4 months ago
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Yogita Ingle 7 years, 4 months ago
The radula is a file-like rasping organ found in molluscs. It helps in scraping food. It also used for creating depression in rocks. The radula is the only means of consuming food and plays a pivotal role in the survival of the animal.
Posted by Himanshu Mishra 7 years, 4 months ago
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Geetesh Rathore 7 years, 4 months ago
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Jiya Aliya 7 years, 4 months ago
Shyam Sharma 7 years, 4 months ago
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Rikshesh Dhiman 7 years, 4 months ago
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Meghna Thapar 5 years, 4 months ago
Cockroaches are equipped with open type circulatory system. In this, blood is pumped by heart and flows open in body cavity. Organs floating in blood get nutrition directly. Supply of oxygen is independent through a separate closed type respiratory system.
To make it more explicit, the circulatory system of cockroaches is primitive consisting of only heart and primary artery. Contrary to higher animals the oxygen supply is not dependent on circulatory system. For this there is a well developed closed respiratory system for assured exchange of gases directly by the tissues.
Posted by Shubham B 7 years, 4 months ago
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Posted by Harsh Chauhan 7 years, 4 months ago
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Yogita Ingle 7 years, 4 months ago
Mycoplasma is called as joker of plant kingdom because these bacteria have the ability to alter their shape or size in response to environmental conditions and live as parasite on plants that's why we can say the joker of plant.
Arpit Singh 7 years, 4 months ago
Posted by Rea Rea 7 years, 4 months ago
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Rea Rea 7 years, 4 months ago
Posted by Jiya Aliya 7 years, 4 months ago
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Jiya Aliya 7 years, 4 months ago
Posted by Rea Rea 7 years, 4 months ago
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Yogita Ingle 7 years, 4 months ago
The average lifespan of RBCs is 120 days. RBCs are finally destroyed in the spleen and hence, spleen is also called the graveyard of RBCs. RBCs play a significant role in transport of respiratory gases. Spleen is an organ of the lymphatic system located in the left side of the abdominal cavity under the diaphragm, the muscular partition between the abdomen and the chest. It is called graveyard of RBC because fragment of red blood cells, old and dead cells are constantly being removed from the blood streams by it.
Posted by Rea Rea 7 years, 4 months ago
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Yogita Ingle 7 years, 4 months ago
The increase in girth of stems of woody angiosperms is called secondary growth. The tissue involved in secondary growth are the two lateral meristems?vascular cambium and cork cambium.
(i) Vascular cambium is a vascular layer present between xylem and phloem (vascular tissues). It is responsible for the cutting off vascular tissues, later it forms a complete ring.
(ii) The cambial ring becomes active and begins to cut off new cells, both towards the inner and the outer sides.
(iii) The cells cut off towards pith, mature into secondary xylem and the cell cut of towards periphery, mature into secondary phloem.
(iv) The cambium is generally more active on the inner side than the outer. As a result, the amount of secondary xylem produced is more than the secondary phloem and soon forms a compact mass.
(v) The primary and secondary phloem get gradually crushed due to the continued formation and accumulation of secondary xylem.
(vi) The primary xylem however, remains more or less intact, in or around the centre.
(vii) At some places, the cambium forms a narrow band of parenchyma, which passes through the secondary xylem and the secondary phloem in the radial directions. These are the secondary medullary rays.
(viii) The stem continues to increase in girth due to the activity of vascular cambium.
Posted by Naman Soni 7 years, 4 months ago
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Yogita Ingle 7 years, 4 months ago
|
Simple epithelium |
Compound epithelium |
|
1. It is composed of only one layer of cells. |
1. It is composed of many layers of cells. |
| 2. It is mainly involved in the function of absorption and secretion. | 2. It is mainly involved in the function of protection. |
| 3. It is present in the lining of the stomach, intestine. | 3. It is present in the lining of the pharynx and buccal cavity. |
Posted by Naman Soni 7 years, 4 months ago
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Posted by Naman Soni 7 years, 4 months ago
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Harsh Srivastav 7 years, 4 months ago
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