Crop Physiology Important Point
Crop Physiology Important Point For All Competitive Exam
1.Difference between C3, C4, & CAM plants (AgriExam.com)
| C3 Plants | C4 Plants | CAM Plants |
| Site of the cycle i.e. leaf structure | ||
| Mesophyll | Mesophyll and Bundle sheath cell | Mesophyll and vacuole |
| CO2, acceptor | ||
| RuBP | PEP | Both |
| 1st stable compound | ||
| 3C PGA | 4C OAA or Malic acid | Both |
| Dark reaction through | ||
| Calvin cycle | Hatch & Slack cycle and calvin cycle | — |
| Pigment system (PS) present in chloroplast | ||
| Both PS-I & PS-II | PS-I | — |
| Compensation point | ||
|
50 ppm
|
1-5 ppm
|
—
|
| Photosynthetic rate | ||
| Medium | High | Slow |
| Biomass production | ||
| medium | High | Slow |
| Photo-respiration | ||
| High | Low/Absent | Slow |
| Transpiration rate | ||
| High | Medium | Low |
| Water use efficiency | ||
| Low | Medium | High |
| Light saturation point | ||
| Low | High | Medium |
| Energy recruitment (CO2:ATP:NADPH) | ||
| 1:3:2 | 1:5:2 | — |
| Optimum Temperature | ||
| 10-25°C | 30-45°C |
25°C
|
| ATP require for one glucose molecule | ||
| 18 ATP | 30 ATP | — |
2.Difference between active and water absorption (AgriExam.com)
| Active water absorption | Passive water absorption |
| it occurs mainly due to the activity of root hairs.Needs energy. | It occurs mainly due to the activity of upper part of plant such as shoot and leaves |
| The water is absorbed due the osmotic and non osmotic mechanisms | The water is absorbed by to the process of active transpiration in the upper part. |
| The osmotic process involves diffusion pressure deficit of the cells | The passive absorption occurs due to the tension created in xylem sap by transpiration pull. |
| The water first enters into the cell sap and then passes from one cell to another (symplast movement). | The water in passive absorption moves probably through the free spaces (apoplast movement). |
3.Difference between Transpiration & Guttation (AgriExam.com)
| Transpiration | Guttation |
| Occurs in day | Occurs in night |
| Water loss in the form of vapour | Water loss in the form of liquid |
| Occurs through stomata, lenticle or cuticles | occurs through hydathodes |
| It is a controlled phenomenon | It is a uncontrolled phenomenon |
4.Essential amino acids: (They cannot be synthesized in our body)
| These are ten in number (Tricks ‘TV,MILL, PATH’) (AgriExam.com) | |
| T | Tryptophan |
| V | Valine |
| M | Methionine |
| I | Iso-leusine |
| L | Leucine |
| L | Lysine |
| P | Phenyl-alanine |
| A | Arginine |
| T | Threonine |
| H | Histidine |
5.Sulfur-containing amino acids (AgriExam.com)
| Sulfur-containing amino acids |
| Methionine |
| cysteine |
| homocysteine |
| taurine |
6.Essential fatty acids (AgriExam.com)
| Four in number, (Tricks ‘OLLA’) | |
| O | Oleic acid |
| L | Linoleic acid |
| L | Linolenic acid |
| A | Arechidonic acid |
7.CARBOHYDRATES (AgriExam.com)
Organic compounds with a general formula (CH2O).
Carbohydrates can be classified into 3 categories, based on degree of polymerization
| CARBOHYDRATES (AgriExam.com) | |
| Monosaccharides (one sugar molecule) | |
| Glucose, Fructose, Galactose | |
| Disaccharides (two sugar molecule) | |
| Sucrose | Glucose+ Fructose |
| Lactose | Glucose+Galactose |
| Maltose | Glucose+Glucose |
| Oligosaccharides (two to ten sugar molecules) | |
| Raffinose, Stachyose | |
| Polysaccharides (ten or more sugar molecules) | |
| Starch, Glycogen, Cellulose | |
- Fructose is the sweetest among all the sugar
- Sucrose is non – reducing sugar
- Lactose is a milk sugar
- Maltose sugar found in germinating seed
- Glycogen is present only in animal cells.
- Maximum part of plant cell wall is made up of Cellulose
Crop Physiology Important Point
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Its vry dificult for me bt u makes it vry esy thnku
Sir plss add more physiology part based on compititive exam.and plss cover plant growth regulator