Anatomy of Flowering Plants — BIOLOGY STD 11 Science — Question

Ria went to see the zoo in her town with her parents and saw many wild animals, their food habits, behaviour, etc. She saw that there was a wide variety of animal life in the zoo. But she was amazed to see that the board placed in front of lion cage and monkey place which tells that both were mammals. However, she thought that they were totally different in appearance.

1. Why lions and monkeys are considered to be mammals?
2. Explain the scientific reason to maintain a zoological park.
3. Is there any similar place to see a variety of plants? If any, then name some.
4. What values are shown by Ria?

Each plant or group of plants has some phylogenetic significance in relation to evolution: Cycas, one of the few living members of gymnosperms is called as the ‘relic of past’. Can you establish a phylogenetic relationship of Cycas with any other group of plants that justifies the above statement?

State economically important uses of: heterotrophic bacteria

Answer the following with reference to the anatomy of dicot root:

1. Where is pericycle located?
2. How are xylem vessels arranged?
3. What do you call such an arrangement?
4. Which type of cells constitute the cortex?

Give the major anatomical and physiological differences between Sympathetic system and Parasympathetic system.

1. Differentiate between RER and SER.
2. Why are mitochondria called 'the power house' of the cell?

Plants require water for their survival. But when watered excessively, plants die. Discuss.

Algae are known to reproduce asexually by variety of spores under different environmental conditions. Name these spores and the conditions under which they are produced.

How useful is the study of the nature of body cavity and coelom in the classification of animals?

Why is the term short-day plants a misnomer? Give one example of short-day plants.