STD 11 - 14. Breathing and exchange in gases — NEET STD 11 Science — Question

Identify the wrong statements for poriferans from given statements.
(i) Metameric segmentation present in poriferans
(ii) Notochord is a mesodermally derived in poriferans.
(iii) Poriferans are primitive multicellular and have cellular level of organisation.
(iv) Digestion is intracellular in poriferans
(v) Poriferans are hermaphrodite and fertilisation is internal.

Which one feature is common to leech, cockroach and scorpion

Lymph glands and nodes help to

Gestation period in human beings is about

Which is correct for given figure ?

The number of fingers in the hindlimb of frog is

Azolla enriches rice fields with nitrogen due to its association with

Which of the following statements are correct for regulation of cardiac activity ?
(i) A special neural centre in the medulla oblongata can moderate the cardiac function through autonomic nervous system.
(ii) Neural signals through the sympathetic nerves can increase the rate of heart beat, the strength of ventricular contraction and thereby the cardiac output.
(iii) Parasympathetic neural signals decrease the rate of heart beat, speed of conduction of action potential and thereby the cardiac output.
(iv) Adrenal medullary hormones can also increase the cardiac output.
(v) Adrenalin or epinephrine increase heart beat.
(vi) Acetylcholine decrease heart beat.

Residual volume is