Choose the incorrect statement from the following:
(A) In birds and mammals internal fertilisation takes place
(B) Colostrum contains gamma globulins and nutrients
(C) Polyspermy in mammals is prevented by the chemicalssecreted by the oviducts
(D) In the human female implantation starts almost seven days afterfertilisation

Which one of the following statements is correct? (a) Fertilization in human takes place in womb (b) Zygote contains haploid number of chromosomes (c) Fertilization membrane avoids polyspermy (d) Primary oocyte inhibits the process of oogenesis

Find the incorrect statement from the following . (a) Tropical rain forests cover around 6 percent of earth's land surface. (b) Animals with migratory habits are badly affected by habitat loss and fragmentation. (c) Mammals and birds require small territories. (d) Amazon rain forest is being cut and cleared for soya bean cultivation or for conversion to grasslands for raising beef cattle

Find the incorrect statement from the following . A. Tropical rain forests cover around 6% of the earth's land surface. B. The Amazonian rain forest is being cut and cleared for soya bean cultivation or for conversion to grasslands for raising beef cattle. C. Animal with migratory habits are badly affected by habitat loss and fragmentation. D. Mammals and birds require small territories.

The figure given below represents the female reproductive system of a mammal. Parts indicated by the guidelines A to D are as follows: (A) Uterus (B) Fallopian tube (oviduct) (C) Ovary (D) Vagina (a) Give appropriate terms for each of the following: (i) The onset of reproductive phase in a young female. (ii) Rupture of follicle and release of ovum from the ovary (iii) Monthly discharge of blood and disintegrated tissues in human female. (iv) Process of fusion of ovum and sperm. (v) Fixing of developing zygote on the uterine wall. (vi) The permanent stoppage of menstruation at about the age of 45 years in a female. (b) State the functions of the (0) Placenta (ii) Amniotic fluid. [ICSE 2004, 2015] (c) Using the symbol "X' indicates the region in the diagram where fertilisation occurs.[ICSE 2004)

Read the following statements regarding evolution (A-D)- A. Whales, bats, cheetah, and humans (all mammals) share similarities in the pattern of bones of forelimbs. B. The diversity of life forms on earth has been changing over millions of years. C. About 65 million years ago the dinosaurs suddenly disappeared from the earth. D. A single-step large mutation is called speciation and explained by Herbert Spencer. How many statements from the above is/are correct ?

Read the statements given below. a. Clonal members of a population exhibit low adaptability b. After initial supply of yolk has been exhausted,growing individuals such as amphibian tadpole must seek its food from surrounding water c. All mammals retain the developing young one in their body for a much longer time period for protection and nourishment d. Life expectancy, a characteristic feature of a species is nearly 67 for humans according to recent survey conducted in India Choose the correct option.

(a) In which part of the human female reproductive system do the following events take place? (i) Release of 1st polar body (ii) Release of 2nd polar body (iii) Fertilisation (iv) Implantation (b) From where do signals for parturition originate and what does maternal pituitary release for stimulating uterine contractions for childbirth?