CBSE Biology Class-Xll Questions

11/28/2011 CBSE

1 Which of the movable joint
makes the hip joint ?

Ball and socket joint.

2 Write the full form of tRNA.

Transfer Ribosenucleic Acid.

3 Mention any two factors by
which the environment or the nature checks the pollution size.

(i) Competition and struggle.

(ii) Drought and flood.

4 Give two examples of analogous
organs from animals.

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.

Chlorophyll-a has a methyl (-CH3) group whereas
chlorophyll-b has an aldehyde (-CHO) group.

6 Name the source glands of glucagon and parathormone.

Glucagon : Islets of Langerhans in Pancreas

Parathormone: Parathyroid gland

7 Mention one difference between benign tumour and malignant tumour.

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.

(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 ?

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.

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.


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