Describe in brief Types of Endosperms.
243. Describe the structure of Root hair with a neat labelled diagram
Q.16. Give an account of the applications of Auxins.
menstrual sysle .
Answers
Answer:
Types of Endosperms
The primary endosperm nucleus divides rapidly to form the endosperm tissue.
The endosperm nuclei increase in size as the development proceeds.
In angiosperms there are three types of endosperm development— namely, nuclear, cellular, and helobial.
structure of Root hair
The structure of root hair is quite suitable for absorbing water from the soil.
- 1. The root hair represents a large surface area in contact with the soil particle.
- 2. The minute root hair can penetrate between soil particles and when it comes in contact with soil water, the cell membrane allows efficient entry of water into the root.
- 3. The cytoplasm and the vacuoles also help in water absorption by osmosis.
the applications of Auxins
Commercial use of auxins is widespread in plant nurseries and for crop production.
IAA is used as a rooting hormone to promote growth of adventitious roots on cuttings and detached leaves.
Applying synthetic auxins to tomato plants in greenhouses promotes normal fruit development.
Menstrual Cycle
The length of the menstrual cycle varies from woman to woman, but the average is to have periods every 28 days. Regular cycles that are longer or shorter than this, from 21 to 40 days, are normal.