Biomolecules — BIOLOGY STD 11 Science — Question

What is acromegaly?

Distinguish between the followings: Prostomium and peristomium.

What is vital capacity? Compared to the atmosphere, there may be partial pressure of O₂ and CO₂ on various parts involved in diffusion.

Describe along with a diagram, the movement of water in the leaf of a terrestrial plant.

What happens to the mitral valve and the related blood flow during ventricular systole?

Cartilaginous fishes do not contain:

1. Fins
2. Gill cover/ operculum
3. Scales
4. Mouth

Which of the following pairs are correctly matched?

S.no.	Animals		Morphological features
(i)	Crocodile	-	4-chambered heart
(ii)	Sea urchin	-	Parapodia
(iii)	Obelia	-	Metagenesis
(iv)	Lemur	-	Thecodont

1. (i), (iii) and (iv).
2. (ii), (iii) and (iv).
3. Only (i) and (iv).
4. Only (i) and (ii).

1. Name the pigment found in the root nodules of legumes.
2. How does this pigment protect the enzyme nitrogenase?

OR
Which substance imparts pink colour to the root nodules of leguminous plants? State its function.

Which areas of plant show elongation phase? Why?

If the critical photoperiod for a short-day plant is 13hrs of daylight, will it flower when there are 15hrs of daylight?