PART - 1 - Unit II : CH - 6 Anatomy of Flowering Plants — BIOLOGY STD 11 Science — Question

Give a brief account of the counter current mechanism.

For the classification of housefly, correctly match the terms given in Column-I with the terms given in Column-II.

Column-I	Column-II
1. Family	(i) Arthropoda
2. Order	(ii) Insecta
3. Class	(iii) Muscidae
4. Phylum	(iv) Diptera

Various parts of the plant such as stems leaves, and even fruits are modified into underground parts to perform various functions such as stems, leaves, and even fruits.
The stems in ginger and banana are underground and swollen due to storage of food. They are called rhizome. Rhizome of ginger is a modification of stem because it bears nodes, internodes, terminal buds, scaly leaves and buds, which give rise to aerial shoots. It is not a root because root does not have nodes and internodes. Also, rhizome does not perform the function of roots i.e. anchorage and absorption, rather it serve as reservoir for storage of food. Similarly, corm is an underground stem in Colocasia (jimikand) The tips of the underground stem in potato become swollen due to accumulation of food and forms tuber.



i. Observe the given flow chart and mention what are the four types of Underground stem modification also mention one example of each. (1)
ii. Ginger is an underground stem but why it is distinguished from a root? (1)
iii. Why do the tips of modified stems in potatoes become swollen? (2)

OR

Are all underground parts of a plant roots? (2)

Explain the process of inspiration under normal conditions.

Write the names of four groups of bacteria on the basis of shape. Name any four diseases caused by bacteria and draw any two picture of bacteria.

Could the number of eggs or young ones produced by an oviparous and viviparous mother be equal? Why?

Write any four differences between afferent arteriole and efferent arteriole.