1 Which of the movable joint
makes the hip joint ?
Ans1. Ball and socket joint.
2 Write the full form of tRNA.
Ans2. Transfer Ribosenucleic Acid.
3 Mention any two factors by
which the environment or the nature checks the pollution size.
Ans3. (i) Competition and struggle.
(ii) Drought and flood.
4 Give two examples of analogous
organs from animals.
Ans4. Wings of :
(i) an insect,
(ii) a bird, and
(iii)a bat are analogous organs.
5 Mention one difference in the
structure of chlorophyll-a and chlorophyll-b.
Ans5. Chlorophyll-a has a methyl (-CH3) group whereas
chlorophyll-b has an aldehyde (-CHO) group.
6 Name the source glands of glucagon and parathormone.
Ans6. Glucagon : Islets of Langerhans in Pancreas
Parathormone: Parathyroid gland
7 Mention one difference between benign tumour and malignant tumour.
Ans7. A malignant tumour is different from a benign tumour in the formers
capacity to undergo metastasis.
8 Name any two structures in our body, which bear ciliated epithilium.
Ans8. (i) Kidney tubules, and
(ii) Fallopian tubes
9 A women travels in a crowded compartment along with people suffering from
diabetes, influenza and amoebiasis. With which one of these diseases she is most
likely to be infected during this journey and why ?
Ans9. Influenza; because among diabetes, influenza and amoebiasis only
influenza is a disease communicable through air.
10 Amongst pea tendrils, opuntia spines, lemon thorns and cucurbit tendril,
which ones are homologous structures ? Give reason.
Ans10. Pea tendrils are homologous to Opuntia spines because both are
modifications of leaves; lemon thorns are homologous to Cucurbit tendril because
both are modified stems.