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

In Hardy-Weinberg principle expression of allele frequency is represented by

Read the following statements.
(A) In osteichthyes, male bears claspers in pelvic fins.
(B) In osteichthyes, mouth is terminal.
(C) Osteichthyes bears 2 pairs of gills which are covered by operculum.
(D) Fertilisation is external with direct development in Osteichthyes.
(E) Betta is commonly known as fighting fish; Pterophyllum as angel fish and exocoetus as saw fish.
(F) Tympanum represent the ear in amphibian and cloaca is common chamber for alimentary canal, urinary and reproductive tract.
(G) Icthyophis is the common limbless reptiles. (H) In Reptilia, fertilisation is internal and development is direct.
(I) Chameleon is commonly known as garden lizard: Hemidactylus as wall lizard and Calotes as tree lizard.
(J) In members of aves, skin is dry without glands except the oil gland at the base of tail.
(K) The digestive tract of birds has additional chamber crop and gizzard.
(L) Air sacs are connected to lungs and supplement respiration in birds.
(M) Neophron is known as vulture; Struthio as ostrich: pavo as parrot and Psittacula as peacock.
(N) In aves, fertilisation is internal and development is indirect.
(0) The most unique feature of mammalian characteristic is the presence of milk producing glands called mammary glands.
(P) The skin of mammals is unique in possessing hairs.
(Q) External ears or pinnae are present in mammals.
Choose the option having all incorrect statements :-

Which statements are incorrect for mechanisms of nerve impulse conduction along electrical junctions of neuron or electrical synapse ?
(i) Nerve impulse flow directly from one neuron to other across the synapses in electrical synapses.
(ii) Transmission of an impulse across electrical synapses is very similar to impulse conduction along a single axon.
(iii) Impulse transmission across an electrical synapse is always faster than that across a chemical synapse.
(iv) Electrical synapses are rare in our system.
(v) At an electrical synapse, the membranes of the pre and post-synaptic neurons are separated by a fluid-filled space called synaptic cleft is thick.
(vi) Chemicals called neurotransmitters are involved in the transmission of impulses at this synapse.

Which one of the following kinds of animal are triploblastic ?

The main function of fimbriae of Fallopian tube is

Identify correct sentence.

Malpighian body or renal corpuscle is