Structural Organisation in Animals — BIOLOGY STD 11 Science — Question

Differentiate between absorption spectrum and action spectrum.

What is acromegaly?

In tropical rainforests, the canopy is thick and shorter plants growing below it, receive filtered light. How are they able to carry out photosynthesis?

Differentiate between hyperglycaemia and hypoglycaemia.

An element is involved in the formation of mitotic spindle. Which part of the plant do you expect it to be present? Name the element. Where else can it also be present?

Mention two conditions which allow the root pressure to occur.

Why there is a need to standardise the system of naming of living organisms?

The vertebral column has four articulation points for the four limbs. This is similar to which of the following? What do you understand by ‘spineless’in the literal sense?

1. A four wheeler has four articulation points for the four wheels.
2. A two wheeler has two articulation points for the two wheels.
3. A snake's vertebral column has no articulation point because it has no limb.

Why does oxygen diffuse into the blood capillaries in the lungs, but out of the blood capillaries in the tissues?

Cell membrane is semi-permeable in nature and thus allows passage to selected substances through it. Which of the following can be learnt from this property of the cell membrane? What are the benefits of selectively learning or adapting certain things for us?

1. We should only eat selected food.
2. We should follow good behaviour only and avoid bad behavior.
3. We should pay respect to selected persons only.