Animal Kingdom — BIOLOGY STD 11 Science — Question

Differentiate between myelinated and non-myelinated axons.

Draw labelled diagrams of. Alternation of generation in Angiosperm.

Distinguish between Chordates and Non-Chordates.

Explain the difference between the following and make a labelled diagram of the parts of a flowering plant.
1. Difference between stipule and bract
2. Phyllotaxy and Venation

Justify the statement, “Mitochondria are power houses of the cell”.

Which hormones are secreted from the posterior pituitary gland? Explain each one's function in detail.

Define RQ. What is its value for fats?

Give a comparative account of:

1. The nature of cell wall,
2. The characteristics of flagella among the three classes of algae.

Amrita was very fond of rice pudding. She told her mother to put raisins in pudding. When her mother served her pudding she saw that raisins that her mother added while preparing the dish had swollen up. She got surprised and asked her father (biology tutor) the reason behind this. Her father told that swelling of raisins had occurred due to the phenomenon of osmosis.

1. Mention the importance of osmosis in plants).
2. What is the logic behind the process of osmosis in swelling of raisins.
3. Describe osmotic pressure.
4. What values of Amrita reflect from this case.

Deepak, (student of XI class), attended a seminar on plant growth and development. As Deepak also belongs to the farmer's family, he was enthusiastic to know upcoming experiments in the field of botany. Guest of the seminar told the students that development in plants is under the control of various intrinsic and extrinsic factors. The intrinsic factors include intracellular or genetic factors as well as intercellular factors like plant growth regulators. Deepak asked the guest about the role of growth regulators used to improve the yield of plants. The guest speaker cleared all doubts of Arun and then Arun returned home happily from the seminar he visited.

1. What are the two groups of PGRs, based on their functions?
2. Give an example of each of the two types.
3. It is said that PGRs may function synergistically of antagonistically. What is meant by these two terms? Give an example for each.
4. What value can be learnt by the nature of Deepak (as a XI class student).