Hydroponics have been shown to be a successful technique for growing of plants. Yet most of the crops are still grown on land. Why?

Explain why angiosperms have been more successful than gymnosperms.

Read the following statements and choose the correct one from the options given below. (i) Hydroponics is the practice of growing plants in nutrient - enriched water , without soil. (ii) Hydroponics has been successfully employed as a technique for the commercial production of vegetables such as tomato. (iii) Hydroponics methods require purified water and non - mineral nutrient salts. (iv) The nutrient solutions should not be aerated to obtain optimum growth. (a) (i) and (ii) only (b) (i) and (ii) only (c) (i) , (iii) and (iv) only (d) (i) , (ii) , (iii) and (iv)

Assertion : The fungi are widespread in distribution and they even live on inside other plants and animals. Reason : Fungi are able to grow anywhere on land, water or on other organisms because they have a variety of pigments, including chlorophyll, carotenoids, fucoxanthin and phycoerythrin.

The Class X students of a secondary school in Krishinagar have been allotted a rectangular plot of land for their gardening activity. Sapling of Gulmohar are planted on the boundary at a distance of 1 m from each other. There is a triangular grassy lawn in the plot as shown in the Figure. The students are to sow seeds of flowering plants on the remaining area of the plot. (i) Taking A as origin, find the coordinates of the vertices of the triangle. (ii) What will be the coordinates of the vertices of DPQR if C is the origin? Also calculate the areas of the triangles in these cases. What do you observe?

Mark whether the following statements are true or false. (i) Entire collection of plants or seeds having all the diverse alleles for all genes in a given crop is called gene pool. (ii) A wide range of pathogens affect the yield of cultivated crop species, especially in tropical climates. (iii) High aspartic acid, low nitrogen and sugar content in maize lead to resistance to aphids. (iv) Biofortification is the most practical means to improve public health.