CBSE Biology Class-Xll Questions

11/28/2011 CBSE

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.



 



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