Name the following
1. Circular sections that share a common centre in a flower.
2. Nutrients like Nitrogen, Phosphorus etc. that are required by the plants in large
amount.
Answers
1. The circular section present in the centre of a flower is called Corolla. The petals of the flower are arranged in the centre forming a circle, which represents the corolla.
Corolla consists of three more circles, namely, Sepals, Stamen and Pistils. The function of this corolla is to assist in the female reproduction of the flower.
2. Nutrients that are required in large quantities by plants are termed Macronutrients. Primary macronutrients are Nitrogen, Phosphorous and Potassium.
Nitrogen is taken up as ions from soil and they are the major part of protein and vitamins.
Phosphorus is required for certain reactions and is also the constituent of the cell membrane and nuclei acid.
Potassium is critical in the functioning of stomata. It maintains the turgidity of the cells and the activation of enzymes.
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