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Solution for Class 12, Biology, Human Physiology

Question 1

Oestrus cycle occurs in which of the following ?

Man
Monkey
Cow
All of these

Topic:

Human Physiology

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Question 2

3. 4. MENSTRUAL CYCLE It is The reproductive cycle in the female prim human beings) is called menstrual cycle. at puberty and is called menarche. In hy is repeated at an average interval of about events starting from one menstruation

t

menstrual cycle. One ovum is released

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Human Physiology

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Question 3

myosin. Both the proteins are arranged as rod-like structures, parallel to each other and also to the longitudinal axis of the myofbrils. Aetin filaments are thinner as compared to the myosin filaments, hence are commonly called thin and thick filaments respectively. In the centre of each 'I' band is an elastic fibre called 'Z line which bisects it. The thin filaments are firmly attached to the '

Z

line. The thick filaments in the 'A' band are also held together in the middle of this band by a thin flbrous membrane called 'M' line. The 'A' and 'T bands are arranged alternately throughout the length of the myofibrils. The portion of the myofibril between two successive '

Z

lines is considered as the functional unit of contraction and is called a sarcomere (Figure 20.2). In a resting state, the edges of thin fllaments on either side of the thick flaments partially overlap the free ends of the thick flaments leaving the central part of the thick filaments. This central part of thick filament, not overlapped by thin flaments is called the 'H' zone.

Topic:

Human Physiology

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Question 4

this lies the adrena(cortex)(Figure

22.4 b

). Underproduction of hormones by the adrenal cortex alter carbohydrate metabolism causing acute weakness and fatigue tead to a disease called Addison's disease.

Topic:

Human Physiology

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Question 5

32. If antisense strand of DNA with

3^{'} \to 5^{'}

polarity has the following sequence, find the base sequence in mRNA E.coli Corporate Ofice : Aakash Tower, 8, Pusa Roed, New

Topic:

Human Physiology

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Question 6

The irregular movement of bowl characterizes which digestive disorder?

Constipation
Diarrhoea
Both
Indigestion

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Human Physiology

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Question 7

Size of DNA (2)

\frac{A + G}{T + C} = 1

(3) Length of DNA only (4) Both (1) and (2) 49. Read the statements carefully and choose the correct option

5 methyl uracil is a base in DNA
Cytidine is the nucleotide in both RNA and DNA
Purines are 6 membered compounds
Both purines and pyrimidines are homocyclic compounds

Topic:

Human Physiology

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Question 8

Ratio of death rate and birth rate percentage is called :

Organic index
Demography
Population density
Total population.

Topic:

Human Physiology

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Question 9

Which of the following is the best solution of population probir

Conservation of natural resources
Growth of medicinat

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Human Physiology

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Question 10

Guel explaint le Differ b wo falmonary Cecteri rein Abd Afota q venaCara Gith finction?

Topic:

Human Physiology

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Question 11

4. Assertion : Thyroid hormones promote physical growth and development of mental faculties. Reason : Hypothyroidism in adults causes retarded sexual development. 5. Assertion : PTH is a hvpercalcemic hormone

Topic:

Human Physiology

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Question 12

All hypophysiotropic hormones are peptides except

corticotropin releasing hormone
growth hormone inhibitory hormone
somatostatin
prolactin release inhibiting hormone.

Topic:

Human Physiology

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Question 13

प्राय सावधिक परीक्षा शिर्धाविक्ष 33 0. 9 NPs stand for

Some nucleotide polymorphism
Single nuclear polymoretoide
Some nuclear protein
Single nuclear polymorphism

Topic:

Human Physiology

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Question 14

(3) Q. Southern blotting technique is associated with

(1) DNA (2) RNA (3) Protein (4) None

Protein
None of these

Topic:

Human Physiology

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Question 15

(2) Q. Who discovered DNA polymerase :

Okazaki
Komberg
Mesclson and stahl
Watson and Crick

Topic:

Human Physiology

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Question 16

(1 Q. Basic ratio is :

$\frac{A - T}{C - G}$
$\frac{A + T}{C - G}$
$\frac{A + T}{C + G}$
None

Topic:

Human Physiology

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Question 17

Q. When was Human genome projecct launched.

1990
1992
1996
1998

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Human Physiology

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Question 18

If a double stranded DNA has

20%

of cytosine, calculate the per of adenine in the DNA ......

$60%$
$40%$
$80%$
$30%$

Topic:

Human Physiology

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Question 19

Which DNA is produced from RNA

A-DNA
C-DNA
B-DNA
Z-DNA

Topic:

Human Physiology

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Question 20

Removal of introns in a transcription unit is ......

Transformation
Splicing
Tailing
Capping

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Human Physiology

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Solution for Class 12, Biology, Human Physiology

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