Transport in Plants — BIOLOGY STD 11 Science — Question

Bile juice contains no digestive enzymes, yet it is important for digestion. Why?

Are the different types of plastid interchangable? If yes, give examples where they are getting converted from one type to another.

Name one synthetic auxin that can be used as a herbicide. Give one more application of the same.

Distinguish between cell membrane and cell wall.

While teaching cell division in the class, teacher told that during meiosis, the chromosome number is reduced to half of the parent, whereas during mitosis, the number remains the same. Seema was not able to recognise what teacher explained in the class and asked her elder brother, a botany student, the need of reducing chromosomes during gamete formation and what will happen if chromosome number will not reduced to its half. He explained the concept in detail to Seema.

1. In which part of the organisms does meiosis occur?
2. How does meiosis help in evolution?
3. Give the significance of meiosis.
4. What value is expressed in the behaviour of Seema's elder brother?

Compare mitral valve and semilunar valve.

Write any four differences between mitosis of animal and plant cells.

Can you describe what happens when milk is converted into curd or yoghurt from your understanding of proteins?

Transpiration is a necessary evil in plants. Explain.

Why biologists do not favour common names? Discuss briefly.