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Answer:

Human activities which generate income are known as economic activities. Economic activities are broadly grouped into primary, secondary, tertiary activities. Higher services under tertiary activities are again classified into quaternary and quinary activities.

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Answer:

Roots are the important underground part of all vascular plants. This part of the plant is mainly responsible for anchoring it down into the ground and absorbing the essential mineral elements, nutrients, and water from the soil. It is also used to store food

All roots have similar functions, however, their structure varies. Hence, based on these criteria, the root system is classified into two types:

Taproots have a main central root upon which, small, lateral roots called root hairs are attached. Mustard, carrot, beetroot, parsley, china rose and all dicotyledons are examples of taproot systems.

Fibrous roots, on the other hand, are bushy roots in which thin, moderately branching roots grow from the stem. Rice, wheat, maize, marigold, banana and all monocotyledons are some examples of the fibrous root system.

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Answer:

Roots are plants' structures that absorb water and nutrients from the soil.

They also provide anchorage to the plants.

Explanation:

There are three types of roots found in angiosperms.

1. Tap Roots
2. Fibrous Roots
3. Adventitious Roots

Tap roots:– The elongation of radicals leads to the formation of tap roots in most of the dicots. Further, it branches into several lateral roots regarded as secondary, tertiary, etc.

The primary roots along its branches constitute the taproot system. Eg. :- mustard plant

Adventitious roots:–When the roots grow from parts another than radical are known as adventitious roots. For example in grass-like monstera and banyan tree.

Fibrous roots:- When the primary root is replaced by fibrous roots as in monocots. They originate from the base of the stem. Eg. :- wheat plant

Answer:

1. The alkali metals dissolve in liquid ammonia giving deep blue solutions which are conducting in nature. The blue colour of the solution is due to the ammoniated electron which absorbs energy in the visible region of light and thus imparts blue colour to the solution. The solutions are paramagnetic.

Answer:

मित्रता , कठोरता, मानवता, अपनापन, चुनाव,