Model Paper 7 — NEET STD 11 Science — Question

Which one is a nonsymbiotic nitrogen fixer

A structure of neuron comprises of

What is correct for emphysema ?

Which of the character is dominant in pea plant

Intestinal excretory organs of Pheretima has a function of

A husband and wife have normal vision but fathers of both of them were colour blind. Probability of their first daughter to be colour blind is

Normal activities of the heart are regulated intrinsically, i.e., auto regulated by specialised muscles (nodal tissue), hence the heart is called myogenic. Read following statement and choose correct option for right statements ?
(i) Mass of this tissue is seen in the lower left corner of the right atrium close to the atrio-ventricular septum called the sino-atrial node (SAN).
(ii) A bundle of nodal fibres, atrioventricular bundle (AV bundle) continues from the AVN which passes through the atrio ventricular septum is known as bundle of His.
(iii) Bundle of His immediately divides into a right and left bundle which form Purkinje fibres.
(iv) The nodal musculature has the ability to generate action potentials without any external stimuli, i.e., it is autoexcitable.
(v) The SAN can generate the maximum number of action potentials, i.e., 90-95 min.
(vi) Our heart normally beats 70-75 times in a minute (average 72 beats min).

When the chromosome number of a given organism has one additional chromosome in one of the homologous pairs, the addition is known as

Reabsorption of useful substances back into the blood from the filtrate in a nephron occurs in

Oxygen can be stored in