Class 12 Biology - Chapter Human Health and Disease NCERT Solutions | Name the primary and secondary lymphoid
Name the primary and secondary lymphoid organs.
(a) Primary lymphoid organs include the bone marrow and the thymus.
(b) Secondary lymphoid organs are the spleen, lymph nodes, tonsils, Peyer’s patches of small intestine, and appendix.
More Questions From Class 12 Biology - Chapter Human Health and Diseas
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(b) Malaria
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- Q:- In which way has the study of biology helped us to control infectious diseases?
- Q:- Discuss with your teacher what does a suitable gene means, in the context of DNA vaccines.
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- Q:-
Fill in the blanks:
(a) Humans reproduce __________. (asexually/sexually)
(b) Humans are__________. (oviparous/viviparous/ovoviviparous)
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(d) Male and female gametes are __________. (diploid/haploid)
(e) Zygote is __________. (diploid/haploid)
(f) The process of release of the ovum from a mature follicle is called__________.
(g) Ovulation is induced by a hormone called the __________.
(h) The fusion of male and female gametes is called _____________.
(i) Fertilisation takes place in _____________.
(j) Zygote divides to form _____________which is implanted in uterus.
(k) The structure which provides vascular connection between fetus and uterus is called ____________. - Q:- What do you think is the significance of reproductive health in a society?
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