Question Bank [2022] — BIOLOGY STD 12 Science — Question

Which is the most well-known pattern of biodiversity ?

When both ovaries are removed from rat which hormone is decreased in blood?

………………. is also called hypophyseal stalk.

Given below are some statements. Which among them are symptoms of pneumonia ?
(i) Greenish, yellow sputum coughed out.
(ii) Hepatomegaly and hypoglycemia.
(iii) High fever with shaking chills.
(iv) Thickening of skin and underlying tissues.
(v) Stabbing chest pain with shortness of breath.
(vi) Mood swings and joint pains along with nausea and vomiting.

Both sickle cell anemia and Huntington’s chorea are:

Gene expression can be controlled with the help of RNA. Explain the method with an example.

The outer layer of the pollen grain is thick and made up of a complex, non-biodegradable substance called _______.

In which of the following era man was originated?

On what basis are the chromosomes usually classified?

The most significant feature of vegetative propagation is that: