Q. Although much carbon dioxide is carried in the blood, yet blood does not become acidic because

NTA AbhyasNTA Abhyas 2022 Report Error

$CO_{2}$ is continously diffused through the tissues and is not allowed to accumulate

100%

$CO_{2}$ combines with water to form $H_{2}CO_{3}$ , which is neutralized by $N a_{2} C O_{3}$

In $CO_{2}$ transport, blood buffers play an important role

$CO_{2}$ is absorbed by leucocytes

Solution:

Nearly 20-25 per cent of carbon dioxide is transported by RBCs whereas 70% is carried as bicarbonate and about 7 % of carbon dioxide is carried in a dissolved state through plasma.
Blood does not become acidic due to buffering action. Bicarbonates act as buffering agents.
$H_{2}O+ \, CO_{2}\rightleftharpoons \, H_{2}CO_{3}\rightleftharpoonsH^{+}+HCO_{3}^{-}$

Questions from NTA Abhyas 2022

1. The amino acid in which R group is $-C H_{2}- \, C H_{2}- \, COOH$ is

2. Select the incorrect statement from the following:
(i) Biomolecules are in metabolic flux in the living state.
(ii) Living process is a constant effort to prevent falling into equilibrium
(iii) Metabolism provides a mechanism for the production of energy
(iv) Living state and metabolism is synonymous

3. How many centromeres are present in a bivalent and how many bivalents are present in a diploid cell of human females respectively?

4. ECG is a graphical representation of the electrical activity of the heart during a cardiac cycle. Identify the incorrect interpretation.

5. Read the following statements and find out the INCORRECT statement.
$\left(a.\right)$ Mons pubis is a cushion of fatty tissue covered by skin and pubic hair.
$\left(b.\right)$ The labia minora are fleshy folds of tissue, which extend down from the mons pubis and surround the vaginal opening only.
$\left(c.\right)$ The opening of the vagina is often covered partially by a membrane called the hymen.
$\left(d.\right)$ The clitoris lies at the upper junction of two labia majora above the urethral opening.
$\left(e.\right)$ The presence or absence of a hymen is a reliable indicator of virginity or sexual experience.

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1. identify the substances having glycosidic bond and peptide bond, respectively in their structure

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Column I Column II

a Gregarious, polyphagous pest i Asterias

b Adult with radial symmetry and larva with bilateral symmetry ii Scorpion

c Book lungs iii Ctenoplana

d Bioluminescence iv Locusta

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a	Gregarious, polyphagous pest	i	Asterias
b	Adult with radial symmetry and larva with bilateral symmetry	ii	Scorpion
c	Book lungs	iii	Ctenoplana
d	Bioluminescence	iv	Locusta

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4. In which of the following techniques, the embryos are transferred to assist those females who cannot conceive ?

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5. The roots that originate from the base of the stem are:

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6. In a cross between a male and female, both heterozygous for sickle cell anaemia gene, what percentage of the progeny will be diseased ?

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7. Which of the following is not an attribute of a population ?

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8. Select the correct match

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9. Identify the wrong statement with reference to the gene T that controls ABO blood groups.