Why does bread mould grow profusely on a moist slice of bread rather than on a dry slice of bread?
Colonies of yeast fail to multiply in water, but multiply in sugar solution. Give one reason for this.
Explain how, offspring and parents of organisms reproducing sexually have the same number of chromosomes?
What is a clone? Why do offsprings formed by asexual reproduction exhibit remarkable similarity?
Can you consider cell division as a type of reproduction in unicellular organism? Give one reason.
In a bisexual flower inspite of the young stamens being removed artificially, the flower produces fruit. Provide a suitable explanation for the above situation
Which among the following diseases is not sexually transmitted?
(a) Syphillis
(b) Hepatitis
(c) HIV – AIDS
(d) Gonorrhoea
The correct sequence of organs in the male reproductive system for transport of sperms is
(a) testis → vasdeferens → urethra
(b) testis → ureter → urethra
(c) testis → urethra → ureter
(d) testis → vasdeferens → ureter
Which among the following is not the function of testes at puberty?
(i) formation of germ cells
(ii) secretion of testosterone
(iii) development of placenta
(iv) secretion of estrogen
(a) (i) and (ii) (b) (ii) and (iii)
(c) (iii) and (iv) (d) (i) and (iv)
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