E. Answer the following.
1. Which structure of a plant cell is non- living and whether are its functions?
2. Name the four types of teeth in humans and mention their number and functions.
3. What is a fruit? State its function.
4. Describe the special characteristics of flowers pollinated by insects.
5. What is germination? List the conditions necessary for germination.
6. Nucleus is the most important part of a cell. Explain?
7. How do villi help in absorption? F. Draw a well- labelled plant cell. State differences between plant cell and animal cell. (9)
Answers
- plant cell, the cell wall is the only part that is non-living because it is an extracellular product and exists outside the living boundary of the cell i.e. the plasma membrane and protects the cell besides providing it a definite shape
2. The four main types of teeth are:
Incisors - Your incisors are eight teeth in. the. front center of your mouth (four on both bottom and top). ...
Canines - Your canines are the next teeth that develop in your mouth. ...
Premolars - Premolars are used for tearing and crushing food. ...
Molars - Your molars are your largest teeth.
3 As a plant organ and container of seed or seeds, the two primary functions of fruits are protection and seed dispersal. 1. Fruits protect the seeds. The fruit serves as a physical barrier between the seed or seeds and the external environment during seed development.
4. 1) Flowers are brightly colored, scented, and secrete nectar. 2) Pollen grains are larger, sticky, and spiny. 3) Pollen grains are fewer in number as they are transported mechanically by insects. 4) The stigma of flowers is small and deep within the corolla.
5. All seeds need water, oxygen, and proper temperature in order to germinate. Some seeds require proper light also. Some germinate better in full light while others require darkness to germinate.
6. The nucleus is the most vital organelle within the cell. It contains the genetic material, the DNA, which is liable for controlling and directing all the activities of the cell. All the RNAs needed for the cell are synthesised within the nucleus.
7. Villi are small finger-like projections found inside the inner walls of the small intestine. They v increase the surface area for absorption of the digested food. Each villus has a network of thin and small blood vessels close to its surface. The surface of the villi absorbs the digested food materials.
Answer:
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