STD 12 - 2. human reproduction — NEET STD 11 Science — Question

Which of the following features is used to identify a male cockroach from a female cockroach?

Assertion: Among vertebrates, fishes use gills whereas reptiles, birds and mammals respire through lungs.
Reason: Amphibians like frogs only respire through their moist skin.

Main excretory organs in a frog are

Which one of the following is not a biofertiliser?

Red marrows of the bone produce

Pavement epithelium is another name for

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 :-

Glucose and amino acids in the filtrate are reabsorbed by tubular epithelial cells through

Statement I: Louis Pasteur demonstrated that life comes only from pre-existing life.
Statement II: Oparin of England and Haldane of Russia proposed that the first form of life could have come from pre existing non-living organic molecules.