Choose the correct statement regarding GIFT to overcome infertility.
GIFT (Gamete Intra Fallopian Transfer) involves transferring an ovum into the fallopian tube of a woman who cannot produce ova but has a normal reproductive tract for fertilization and development.
Which of the following statements are correct with reference to human endoskeleton?
(A) Human skull is monocondylic.
(B) The joint between any two adjoining vertebrae is a cartilaginous joint.
(C) In human beings, the number of cervical vertebrae is seven.
(D) All ribs except the last two pairs are bicephalic.
(E) The occipital bone of skull is articulated with atlas vertebra.
Choose the correct answer from the options given below:
Humans possess seven cervical vertebrae. Adjacent vertebrae are connected by cartilaginous joints. The occipital bone articulates with the atlas. The human skull is dicondylic, and the last three pairs of ribs are not bicephalic.
Spermatogonia undergo a series of cell divisions to produce sperms. Select the correct statements from the following:
(A) Spermatogonia always undergo meiotic cell division.
(B) Primary spermatocytes divide mitotically to produce secondary spermatocytes.
(C) Secondary spermatocytes, through their second meiotic division, produce haploid spermatids.
(D) Spermatids produce spermatozoa through mitosis.
(E) Spermatids transform into spermatozoa by spermiogenesis.
Choose the correct answer from the options given below:
Spermatogonia divide mitotically. Primary spermatocytes undergo meiosis I to form secondary spermatocytes. Secondary spermatocytes undergo meiosis II to produce spermatids, which transform into spermatozoa by spermiogenesis.
Select the incorrect statements with reference to Rh grouping.
(A) Erythroblastosis foetalis is a condition observed having foetus with Rh- blood and mother with Rh+ blood.
(B) Rh antigen is observed on RBCs in the majority of human beings.
(C) Before blood transfusion, Rh group should also be matched.
(D) Rh incompatibility is observed when a pregnant mother is Rh- and the foetus is Rh+.
(E) Erythroblastosis foetalis can be avoided by administering anti-Rh antibodies to the mother immediately after the delivery of the second child.
Choose the answer from the options given below:
Statement A is incorrect because erythroblastosis foetalis occurs when the mother is Rh- and the foetus is Rh+. Statement E is incorrect because anti-Rh antibodies are administered immediately after the delivery of the first Rh+ child, not the second.
In a population of a grasshopper species, the chromosome number of some members is 23 and some other members possess 24 chromosomes. The 23 and 24 chromosome-bearing members in this species are ________.
Grasshoppers show the XO type of sex determination. Males possess 23 chromosomes (XO), whereas females possess 24 chromosomes (XX).
Evolution of human appears parallel to the progressive development of brain and language skills. As such, the evolution of individual species in the sequence of their appearance is:
According to NCERT, the evolutionary sequence is Ramapithecus → Homo habilis → Homo erectus → Neanderthal man → Homo sapiens.
Which of the following floral formula is the correct
floral formula of Solanaceae family ?
Explanation:
The floral formula of Solanaceae (e.g., potato, tomato) in NCERT is pentamerous and gamopetalous with a superior, syncarpous ovary. The standard formula is K5 C5 A5 G(5) — 5 sepals (calyx), 5 petals fused into a tube (corolla), 5 stamens, and a 5-celled syncarpous ovary. Thus, option 3 is correct.
🧠 Did You Know?
Solanaceae flowers are usually regular and zygomorphic in some genera, but NCERT describes the common pentamerous, actinomorphic flowers with fused corolla in this family.
💡 NCERT Memory Line:
Solanaceae: K5 C5 A5 G(5) – pentamerous, fusion in corolla, superior syncarpous ovary.
