A farmer adds Azotobacter culture to soil before sowing maize. Which mineral element is being replenished?

Which of the following statements are true? If false, correct them: (a) Boron deficiency leads to stout axis. (b) Every mineral element that is present in a cell is needed by the cell.

Paragraph based Questions : Read the paragraph and answer the questions given below : Lady bug beetles are friends of farmers as the destroy harmful insects. It is a predatory insect which lives on biting worm, white fly worm, whit moth, flower insects and bread worms. It acts as natural insecticide for crops like maize, jawar, cotton, sugarcane, cereals, vegetables, fruit trees, etc. These are attractive red or yellow or grey coloured insects. Many species of this insect are, found in our farms. The lifecycle of this insect follows: eggs, larvae, cocoon & moth stages. The eggs , found in flutter. The larvae are grey in colour. Larvae and adults both live on sucking insects. How does it help the farmers?

Paragraph based Questions : Read the paragraph and answer the questions given below : Lady bug beetles are friends of farmers as the destroy harmful insects. It is a predatory insect which lives on biting worm, white fly worm, whit moth, flower insects and bread worms. It acts as natural insecticide for crops like maize, jawar, cotton, sugarcane, cereals, vegetables, fruit trees, etc. These are attractive red or yellow or grey coloured insects. Many species of this insect are, found in our farms. The lifecycle of this insect follows: eggs, larvae, cocoon & moth stages. The eggs , found in flutter. The larvae are grey in colour. Larvae and adults both live on sucking insects. Of which colour the lady bug beetles are?

Paragraph based Questions : Read the paragraph and answer the questions given below : Lady bug beetles are friends of farmers as the destroy harmful insects. It is a predatory insect which lives on biting worm, white fly worm, whit moth, flower insects and bread worms. It acts as natural insecticide for crops like maize, jawar, cotton, sugarcane, cereals, vegetables, fruit trees, etc. These are attractive red or yellow or grey coloured insects. Many species of this insect are, found in our farms. The lifecycle of this insect follows: eggs, larvae, cocoon & moth stages. The eggs , found in flutter. The larvae are grey in colour. Larvae and adults both live on sucking insects. State the stages of its lifecycle.

Paragraph based Questions : Read the paragraph and answer the questions given below : Lady bug beetles are friends of farmers as the destroy harmful insects. It is a predatory insect which lives on biting worm, white fly worm, whit moth, flower insects and bread worms. It acts as natural insecticide for crops like maize, jawar, cotton, sugarcane, cereals, vegetables, fruit trees, etc. These are attractive red or yellow or grey coloured insects. Many species of this insect are, found in our farms. The lifecycle of this insect follows: eggs, larvae, cocoon & moth stages. The eggs , found in flutter. The larvae are grey in colour. Larvae and adults both live on sucking insects. How does the lady bug beetle live?

If a plant shows a symptom which could develop due to deficiency of more than one nutrient, how would you find out experimentally, the real deficient mineral element?

Complete the paragraph Fill in the blanks by selecting the correct word from the bracket and complete the given paragraph. (in vivo, tissue culture, biotechnology, energy. ex vivo, genctic enginecring, aseptic, agar,temperature, totipotency, tissue, collagen) Techniques for bringing about improvements in living organisms for the welfare of human beings are together called ________.It includes________and tissue culture. The_______ growth of cells in an nutrient-rich and________ medium is called tissue culture. In this process, a liquid, solid or gel like medium is prepared from____ which supplies nutrients and____ necessary for the cells to grow.

Choose the correct alternative : Which soil is made up of the mineral called silicon dioxide (quartz) ?

What are essential elements for plants? Give the criteria of essentiality?How are minerals classified depending upon the amount in which they are needed by the plants?