Short Answer TypeMention one significant difference between each of the following :
Morula and Blastula
State the contribution of the following scientists :
(i) Robert Koch
(ii) Edward Jenner
(iii) Hansen
(iv) John Otto
(v) Funk
Long Answer Type(a) Give the anatomical (internal structure) differences between a dicot stem and a monocot stem.
(b) Give an account of the different types of soil water.
(c) State the importance (one point) and one deficiency symptom of the following in our body.
(i) Folic acid
(ii) Phosphorus
(a)
|
Dicot stem |
Monocot stem |
|
|
1. |
Hypodermis is collenchymatous. |
Hypodermis is sclerenchymatous. |
|
2. |
Its cortex is few layers thick. |
Cortex is continuous upto centre and is called the ground tissue. |
|
3. |
Endodermis is present. |
Endodermis is absent. |
|
4. |
Medullary rays are present between vascular bundles. |
Medullary rays are absent. |
|
5. |
The central cylinder consists of parenchymatous pith. |
Pith is not distinct. |
|
6. |
Vascular bundles are found in a ring. |
Vascular bundles are found scattered. |
|
7. |
Vascular bundles are collateral and open type. |
Vascular bundles are collateral and closed type. |
|
8. |
Bundle sheath is absent. |
Bundle sheath is well developed. |
(i) Chemically combined water - It is found in chemical combination with soil particles and is not available to the plants.
(ii) Hygroscopic water - Some water is present around the soil particle and gets imbibed into the soil particles by the process of imbibition. It is also not available to the plants.
(iii) Capillary water - Some water is held in the form of a water film in between the soil particles. It is the only soil water that is available to the plants and is absorbed by the root hairs.
(iv) Gravitational or free water - After the rains, some water goes into the lower strata of the earth due to the gravitational force of the earth and gets collected in the form of underground water. This water is also not available water to the plants.(i) Folic Acid
Importance: It is important for the formation of blood and proper growth of the body.
Deficiency Symptoms: Deficiency of folic acid leads to a condition called anaemia.
(ii) Phosphorus: Importance: It is necessary for the formation of teeth, bones, ATP and nucleic acids.
Deficiency Symptoms: Its deficiency leads to the weakening of bones and teeth.
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