Strategies for Enhancement in Food Reproduction — BIOLOGY STD 12 Science — Question

Write down the ploidy of the cell of microspore tetrad.

Your advice is sought to improve the nitrogen content of the soil to be used for cultivation of a non-leguminous terrestrial crop.

1. Recommend two microbes that can enrich the soil with nitrogen.
2. Why do leguminous crops not require such enrichment of the soil?

Write the normal body temperature of humans. How is it maintained during summers?

Draw a labelled diagram of Nucleosome with H1 histone.

1. Why are the plants raised through micropropagation termed as somaclones?
2. Mention two advantages of this technique.

How do the oral pills help in birth control? Name common pills used.

Define the terms: (i) Bio patent, (ii) Bio Piracy

Why is medical termination of pregnancy (MTP) carried out?

How do mammals living in colder regions and seals living in polar regions able to reduce the loss of their body heat?

The following statements (i), (ii) and (iii) seem to describe the waterpollinated submerged plants. Which one of these statements is incorrect?

1. The flowers do not produce nectar.
2. The pollen grains have mucilaginous covering.
3. The brightly coloured female flowers have long stalk to reach the surface.