STD 12 - 7. human health and disease — NEET STD 11 Science — Question

- They are pathogens

- They attack insects and other arthropods.

The joint present in the human neck is

Homologous structures have

If a person exhales out forcefully by applying all his efforts. What will the pulmonary volume inhaled by him immediately under normal condition without applying any extra effort?

Which of the following meninges is in contact with the brain tissue?

Choose correct option for given statements :
(i) The universe is very old almost 20 billion years old.
(ii) In the solar system of the milky way galaxy, earth was supposed to have been formed about 4.5 billion years back.
(iii) Life appeared 500 million years after the formation of earth.
(iv) The first non-cellular forms of life could have originated 3 billion years back. They would have been giant molecules (RNA, Protein, Polysaccharides, etc.).
(v) The first cellular form of life did not possibly originate till about 2000 million (2 billion) years ago. These were probably single-cells.
(vi) All life forms were in water environment only.

Calcium is important in skeletal muscle contraction because it

Assertion: Erythrocytes, leucocytes and platelets are collectively called formed elements and they constitutes nearly 55 per cent of the blood.
Reason: Leucocytes or White Blood Cells (WBC) are the most abundant of all the cells in blood.