In a flower, the parts that produce male and female gametes (germ cells) are
(a) stamen and anther
(b) filament and stigma
(c) anther and ovary
(d) stamen and style
In the list of organisms given below, those that reproduce by the asexual method are
(i) banana
(ii) dog
(iii) yeast
(iv) Amoeba
(a) (ii) and (iv) (b) (i), (iii) and (iv)
(c) (i) and (iv) (d) (ii), (iii) and (iv)
Why is the flow of signals in a synapse from axonal end of one neuron to dendritic end of another neuron but not the reverse?
“Nervous and hormonal systems together perform the function of control and coordination in human beings.” Justify the statement.
Name various plant hormones. Also give their physiological effects on plant growth and development.
Mention one function for each of these hormones :
(a) Thyroxin
(b) Insulin
(c) Adrenaline
(d) Growth hormone
(e) Testosterone.
What constitutes the central and peripheral nervous systems? How are the components of central nervous system protected?
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