Mineral Nutrition — BIOLOGY STD 11 Science — Question

What is common to whale, seal and shark?

1. Seasonal migration.
2. Thick subcutaneous fat.
3. Convergent evolution.
4. Homeothermy.

Which of the following phyla has no freshwater animals?

1. Chordata
2. Mollusca
3. Echinodermata
4. Arthropoda

Distinguish between impulse conduction in a myelinated nerve fibre and unmyelinated nerve fibre.

Earty morning Mita and her family returned back from few days holiday trip. While preparing breakfast. Mita saw her mother using bread with a greenish layer grown over it. She stopped her mother not to use such breads. She also explained her that it was due to the growth of bread mould She also advised her to keep bread in refrigerator for avoiding such growth.

1. Name the class to which bread mould belongs.
2. Name the bread mould.
3. Give two examples of the same class.
4. What values are shown by Mita?

In areas witnessing heavy flood which plant regulator should be used for better yield of rice. Give reasons.

How many chambers are there in fish heart?

1. Two
2. Three
3. Four
4. One

Which products formed during the light reactidn of photosynthesis are used to drive the dark reaction?

Poison teeth in snakes are called:

1. Incisors
2. Canines
3. Heterodont
4. Fangs