Biology:2008:CBSE:[All India ]:Set-III
To Access the full content, Please Purchase
-
Q1
Name any two vertebrate body parts that are homologous to human forelimbs.
Marks:1View AnswerAnswer:
Seal’s front flipper and bat’s wings.
-
Q2
When and why do some animals like snail go into aestivation?
Marks:1View AnswerAnswer:
Some animals like snail and ground squirrels spend the dry-hot period in an inactive state called as aestivation to avoid heat. They spend the hot period in a torpid state in their burrows.
-
Q3
What is the economic value of Spirulina?
Marks:1View AnswerAnswer:
Spirulina serves as food rich in protein, mineral and vitamins.
-
Q4
What was the specialty of the milk produce by the transgenic cow Rosie?
Marks:1View AnswerAnswer:
Transgenic cow Rosie produces milk containing human proteins, (lactalbumen) which may help in the treatment of human emphysema.
-
Q5
Why is the polar region not a suitable habitat for tiny humming birds?
Marks:1View AnswerAnswer:
According to the Bergman’s rule warm–blooded animals (birds and mammals) are generally of large size in colder region. Moreover humming birds do not have any anti-freezing protein in their blood like fishes, essential for living in low temperature (below 00C).
-
Q6
Mention the carbon positions to which the nitrogenous base and the phosphate molecule are respectively linked in the nucleotide given below:
Marks:1View AnswerAnswer:
C1- nitrogen base and C3- phosphate
-
Q7
Given below are some human organs. Identify one primary and one secondary lymphoid organs:
Liver, thymus, Stomach, Thyroid, TonsilsMarks:1View AnswerAnswer:
Primary lymphoid organs – Thymus
Secondary lymphoid organs – Liver -
Q8
Suggest any two techniques which can help in early detection of bacterial/viral infections much before the symptoms appear in the body.
Marks:1View AnswerAnswer:
Widal Test and ELISA.
-
Q9
(a) Expand IUD.
(b) Why hormone releasing IUD considering a good contraceptive to space children?Marks:2View AnswerAnswer:
(a) IUD: Intra Uterine Devices.
(b) The hormone releasing IUDs, make the uterus unsuitable for implantation and the cervix hostile to the sperm. So IUD is a good contraceptive for females to space children. -
Q10
Why do sportspersons often fall victim to cocaine addiction.
Marks:2View AnswerAnswer:
Cocaine has a potent stimulating action on the central nervous system, producing a sense of euphoria and increase in energy. That is why sportspersons often fall a victim to cocaine addiction.
