Biomolecules — BIOLOGY STD 11 Science — Question

Give reasons for the following.

1. Plants are the lungs of nature.
2. Chlorophyll-b and other accessory pigments are necessary for photosynthesis.
3. In the high light intensities, the chlorophyll-a gets damaged.

What are meristems? How does the primary growth differ from that of secondary growth?

Find examples where the four daughter cells from meiosis are equal in size and where they are found unequal in size.

Give a brief explanation of photosynthesis.

Observe the given figure and answer the 983 following questions.

1. State the nature of solution mark (1).
2. What process has been depicted in figures C to D?
3. What will be present in the space marked as (2)?
4. In which figures turgor pressure will be zero?
5. In which figures wall pressure will be positive?

Write short notes on:

1. Importance of carbon fixation by algae.
2. Importance of Gymnosperms.
3. Importance of Angiosperms.
4. Medicinal Use of Algae.

An abnormal type of secondary growth is called anomalous secondary growth.

1. In which plants it occur?
2. How does it occur?

Write brief note on the following: Synaptonemal complex.

During biology class, the teacher was explaining the characteristics of living things. Abhay became confused after knowing, that all the characteristics of human beings are similar to other animals. He asked his teacher about any characteristic that is exclusively found only in human beings. The teacher smiled appreciated Abhay for his attentiveness and explained him about it.

1. What is the characteristic exclusively found in humans?
2. What are the characteristics of living things?
3. Why viruses are not considered as living?
4. What values are shown by Abhay?