Biological Classification — BIOLOGY STD 11 Science — Question

Why Ginkgo biloba is called living fossil?

Explain how is it useful for horticulturists. What are its important features?  Why horticulturists prefer to grow only male plants?

Describe in detail the events in Prophase I of meiosis.

Name the following:

1. A poisonous mushroom having white spores.
2. Edible Basidiomycetes.
3. Fungus used in brewing industry.
4. It is searched by trained pets.
5. Root-like, cards-like hyphal masses having a distinct growing point.
6. Non-motile meiospores develop in Basidiomycetes.
7. Compact groups of hyphae produced to overcome unfavourable conditions.

A sample of urine was diagnosed to contain high content of glucose and ketone bodies. Based on this observation, answer the following:

1. Which endocrine gland and hormone is related to this condition?
2. Name the cells on which this hormone acts.
3. What is the condition called and how can it be rectified?

List out any five diagnostic features of family-Liliaceae.

What is the most common liverwort? Draw itswell-labelled diagram. What is the nature of itsthallus?

Proteins have been called 'biological polymers'.Explain.

Neha planned to go the lakeside for picnic with her friends. Suddenly they noticed a man drowning in the lake. Everyone was frightened, but Neha asked them to stop panicking and take the man out of water. After the man was rescued, he was found unconscious. Neha then suggested that mouth to mouth artificial respiration should be given to save the man. One of her friend did as she guided.

Finally, the man was saved. He thanked Neha and her friends for their help.

1. Why is artificial respiration given?
2. Can artificial respiration bring back a person to consciousness even after death?
3. What values are shown by Neha?

Cross pollination is necessary for bringing variations in plants; while self pollination does not bring variations. Find a similar statement from the following. Explain the benefits of cross pollination of ideas.

1. Inter-caste marriages are good for bringing cross-cultural assimilation; while same-caste marriages are not.
2. Interacting with people of different mindsets can enrich our thought, while sticking to interacting with like-minded people can stunt our mental development.
3. We should respect the feelings of all religions and cultures.

List any six features of cartilaginous fishes. Give four examples of these.