HSC Science कक्षा ११ - Tamil Nadu Board of Secondary Education Question Bank Solutions for Biology (Botany and Zoology)

How phosphorylase enzyme open the stomata in starch sugar interconversion theory?

What are the parameters which control water potential?

List out the non-photosynthetic parts of a plant that need a supply of sucrose?

An artificial cell made of selectively permeable membrane immersed in a beaker (in the figure). Read the values and answer the following questions?

1. Draw an arrow to indicate the direction of water movement.
2. Is the solution outside the cell isotonic, hypotonic or hypertonic?
3. Is the cell isotonic, hypotonic or hypertonic?
4. Will the cell become more flaccid, more turgid or stay in its original size?
5. With reference to the artificial cell state, is the process endosmosis or exosmosis? Give reasons.

Identify correct match.

1. Die back disease of citrus - (i) Mo
2. Whip tail disease - (ii) Zn
3. Brown heart of turnip - (iii) Cu
4. Little leaf - (iv) B

Identify the incorrect statement about the Gram positive bacteria

Identify the Archaebacterium

The correct statement regarding Blue green algae is ________.

Identify the correctly matched pair

Why do farmers plant leguminous crops in crop rotations/mixed cropping?

Which of the plant group has gametophyte as a dominant phase?

Do you agree with the statement ‘Bryophytes need water for fertilization’? Justify your answer.

Distinguish between prokaryotes and eukaryotes.

In Gymnosperms, the activity of sieve cells are controlled by ______.

Grafting is successful in dicots but not in monocots because the dicots have ______.

Which among the following is correct?

1. apoplast is fastest and operate in nonliving part.
2. Transmembrane route includes vacuole.
3. symplast interconnect the nearby cell through plasmadesmata.
4. symplast and transmembrane route are in living part of the cell.

If the concentration of salt in the soil is too high and the plants may wilt even if the field is thoroughy irrigated. Explain

Differentiate homoiomerous and heteromerous lichens.

Give a general account on lichens.

Which of following represents gametophytic generation in pteridophytes?