Select the correct word from the following list and fill in the blanks:
float, water, crop, nutrients, preparation
(a) The same kind of plant grown and cultivated on a large scale at a place is called ____.
(b) The first step before growing crops is ______ of the soil.
(c) Damaged seeds would _____ on top of the water.
(d) For growing a crop, sufficient sunlight and _____ and ______ from the soil are essential.
(a) The same kind of plants grown and cultivated on a large scale at a place is called crop.
(b) The first step before growing crops is the preparation of the soil.
(c) Damaged seeds would float on top of the water.
(d) For growing a crop, sufficient sunlight and water and nutrients from the soil are essential.
Crop: When the same type of plants are grown and cultivated at one place in huge quantity, it is known as a crop.
Crops can be improved by adopting proper farm practices, adequate irrigation and drainage systems, and the usage of herbicides, pesticides, and fertilizers in appropriate quantities.
In modern techniques, crops are improved through genetic techniques such as gene transfer to form genetically modified crops (GM Crops) or conventional methods like hybridization. These genetic methods are also used to produce high-yielding varieties (HYV) seeds which upon cultivation provide a high yield.
Crop production is the branch of agriculture dealing with the cultivation of crops for obtaining food and fiber.
It includes various agricultural practices to cultivate crops such as
(i) Preparation of soil through (tilling or plowing)
(ii) Sowing of seeds (based on the type of soil and climate)
(iii) Irrigation (watering the soil)
(iv) Nutrient and pests management (addition of biofertilizer, manure, pesticides, insecticides, etc.)
(v) Protecting and harvesting of a crop
(vi) Storage and preservation of yielded crop (fumigation, cold storage, etc.).
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- The most rapidly dwindling natural resource in the world is:(a) water (b) soil (c) sunlight (d) forests
- Which of the following statements are “true”?(a) Water vapour is present in air only during the monsoon.(b) Water evaporates into air from oceans, rivers and lakes but not from the soil.(c) The process of water changing into its vapour is called evaporation.(d) The evaporation of water takes place only in sunlight.(e) Water vapour condenses to form tiny droplets of water in the upper layers of air where it is cooler.
- A soil sample was taken by Boojho, from agricultural land and was weighed. The mass of the soil was found to be 40g. 80 mL of water was taken in a measuring cylinder and added to the soil sample. The soil absorbed 60 mL of water and the rest left in the measuring cylinder. Calculate the absorption rate of water by the soil.
- Read the following statements and give the appropriate terms for each of them.(a) The process of breakdown of rocks by the action of wind, water, sunlight.(b) Removal of top soil during heavy rains or strong winds.(c) Accumulation of wastes in the soil generated by human activity which alter the features of soil.(d) The process of movement of water into deeper layers of soil.
- State whether the following statements are true or false. If false, give the correct statement.(a) Forests influence climate, water cycle and air quality.(b) In a forest, trees form the uppermost layer, followed by herbs. The shrubs form the lowest layer of vegetation.(c) The forest keeps on growing and changing and can regenerate.(d) Forests protect the soil from erosion.
- Which are the crops grown in red soil?
- Fill in the blanks.(a) The presence of specific features that enable a plant or an animal to live in a particular habitat, is called ________.(b) The habitats of the plants and animals that live on land are called _____ habitats.(c) The habitats of plants and animals that live in water are called _____ habitats.(d) Soil, water, and air are the ______ factors of a habitat.(e) Changes in our surroundings that make us respond to them, are called ______.
- Mention two human activities which affect the quality of the soil on a large scale.
- DIRECTIONS: Read the passage(s) given below and answer the questions that follow. Passage- The transfer of pollen from another to the stigma of a flower is called pollination. If the pollen lands on the stigma of the same flower it is called self-pollination. When the pollen of a flower lands on the stigma of another flower of the same plant, or that of a different plant of the same kind, it is called cross-pollination. Which of the following can carry pollen grains?(a) wind.(b) water.(c) both wind and water.(d) none of these.
- Which of the following is not a natural resource?(a) soil (b) water (c) electricity (d) natural gas
- Read the following statements with reference to soil.Weathering is a very fast process of soil formation.Percolation of water is faster in sandy soils.Loamy soil contains only sand and clay.Topsoil contains the maximum amount of humus.Choose the correct statements from the above.(a) (ii) and (iv)(b) (i) and (iii)(c) (ii) and (iii)(d) (i) and (ii)
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