Question

6.
7.
"Bacteria are harmful to human beings." Briefly explain this statement.
With reference to number of seeds, venation in the leaves and type of roots, differentiate
between monocotyledonous and dicotyledonous plants.
Briefly describe the binary fission in Amoeba.
8.
PROJECT
bodies
Collect a small monocotyledonous plant and a dicotyledonous plant. Dry each of
them by pressing in between folds of a newspaper. Observe and record the
differences in their structures.
Classification of Pla
31​

Answer 1

1. There are two ways bacteria can harm the human body: toxicity – the bacteria produce toxins which damage specific tissues in the body. invasiveness – the bacteria multiply rapidly at the site of infection and overwhelm the body's defence mechanisms. The bacteria may then spread to other parts of the body.
2. Differences Between Monocots and Dicots

• Monocots can be defined as the plants with the seed having only one cotyledon, and the plant is called as monocotyledons, while plants with the seed having two cotyledons are called as dicots, and the plant is called as dicotyledons.
• In monocots the embryo has only one cotyledon, the pollen tube contain single pore or furrow (monocolpate), whereas in dicots the embryo has two cotyledons and the pollen tube have three or more pore or furrow (tricolpate).
• The flower parts are present in multiples of three in the monocotyledons, even the secondary growth and cambium is absent, but in dicots, the flower parts are present in multiples of four or five, even secondary growth and cambium is present