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

In Spermiogenesis.........

Which statement is not correct for drugs abuse ?
(i) Opioid receptors present in our central nervous system and gastro-intestinal tract.
(ii) Cannabinoid receptors present principally in the brain.
(iii) Coca alkaloid has a potent stimulating action on central nervous system.
(iv) Coca alkaloid interferes with the transport of the neuro-transmitter dopamine.
(v) Heroin is a depressant and slows down body functions.
(vi) Morphine is a very effective sedative and painkiller, and is very useful in patients who have undergone surgery.
(vii) Cocaine produces a sense of euphoria and increased energy.

Characteristics of female cockroach

Choose correct option for given statements :
(i) Secondary or anamnestic response produces in subsequent encounter with the same pathogen, elicits a highly intensified response.
(ii) In our body, memory cell appears in blood during primary response.
(iii) The primary and secondary immune responses are carried out with the help of B-lymphocytes and T-lymphocytes.
(iv) The B-lymphocytes produce antibodies.
(v) The T-cells help B-cells in production of antibodies.
(vi) The cell-mediated immune response is responsible for the graft rejection.

Which one of the following is not matched with Medal's law of dominance

Which of the following is true for all amphibians?

Statement I: The descending limb of loop of Henle is permeable to water but almost impermeable to electrolytes.
Statement II: The ascending limb is imperable to water but allows transport of electrolytes actively or passively.

The phylum Arthropoda is named so because of presence of