Mineral Nutrition — BIOLOGY STD 11 Science — Question

Explain Rh-incompatibility in humans.

Give the characteristic features of the following citing one example of each. Urochordata and cephalochordata.

Find out a qualitative test for proteins, fats and oils, amino acids and test any fruit juice, saliva, sweat and urine for them.

Illustrate the taxonomical hierarchy with suitable examples of a plant and an animal.

Minerals are present in the soil in sufficient amounts. Do plants need to adjust the types of solutes that reach the xylem? Which molecules help to adjust this? How do plants regulate the type and quantity of solutes that reach xylem?

Explain the process of digestion in the buccal cavity with a note on the arrangement of teeth.

Amit went on mountain for trekking. After reaching at about 2000 m height. He experienced difficulty in breathing. His rate of breathing increased and he decided to discontinue the trek and return back to the ground. Being concerned about his health. ls consulted his doctor friend about it? His friend explained that it is a normal phenomenon and he should have carried an oxygen cylinder while going for the trek.

1. Why is it difficult to breathe as we go up on a height?
2. Why does his friend suggested to carry an oxygen cylinder?
3. Which component of blood show its increase when someone moves from plains to higher altitudes?
4. What values are shown by Amit?

Why is solute potential always negative? Explain yw = ys + y

Describe the structure of the following with the help of labelled diagrams. Nucleus

Nicotiana tabacum, a Short Day Plant, when exposed to more than critical period of light fails to flower.Explain.