Zoology

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Q1. The seminiferous tubules open into which of the following structures before entering the epididymis?

Vas deferens
Ejaculatory duct
Rete testis
Seminal vesicle

Q2. Which layer of blood vessels is comparatively thin in veins but thick in arteries?

Tunica externa
Tunica media
Tunica intima
Endothelium

Q3. Consider the given two statements:

Assertion (A):	Hypothyroidism during pregnancy may result in stunted growth and mental retardation in the developing fetus.
Reason (R):	Thyroid hormones are essential for normal development and maturation of the brain in the fetus.

Both(A)and(R)are True and(R)is the correct explanation of(A).
Both(A)and(R)are True but(R)is not the correct explanation of(A).
(A)is True but(R)is False.
(A)is False but(R)is True.

Q4. The midbrain, located between the thalamus/hypothalamus of the forebrain and pons of the hindbrain, contains a canal that passes through it called the:

Cerebral aqueduct
Corpus callosum
Central canal
Fourth ventricle

Q5. The small but critical region of the brain that controls various functions, including temperature regulation, thirst, hunger, and is involved in regulation of endocrine functions, is:

Medulla oblongata
Pons
Midbrain
Hypothalamus

Q6. What does a right shift in the oxygen dissociation curve of hemoglobin indicate about the physiological conditions?

Decreased oxygen affinity, indicating conditions such as a lower pH, a higher temperature, or increased levels of CO₂.
Increased oxygen affinity, indicating conditions such as a higher pH, a lower temperature, or decreased levels of CO₂.
Decreased temperature and CO₂ levels, leading to a reduced ability of hemoglobin to release oxygen to tissues.
Increased hemoglobin saturation with oxygen at lower partial pressures, indicating hyperventilation.

Q7. Which statement correctly describes the impact of temperature on enzyme activity?

Enzyme activity decreases indefinitely as temperature increases due to increased kinetic energy of the substrates.
Enzyme activity increases until an optimum temperature is reached, beyond which activity declines rapidly due to denaturation.
Enzyme activity is independent of temperature changes within the living organism’s permissible range.
High temperatures always increase enzyme stability and, therefore, enhance enzyme activity.

Q8. Which of the following techniques is used to introduce recombinant DNA into bacterial cells?

Polymerase Chain Reaction (PCR)
Southern blotting
Gel electrophoresis
Transformation

Q9. Consider the given two statements:

Assertion (A):	Bt cotton plants are resistant to insect pests like the bollworm.
Reason (R):	The Bt toxin produced in these plants is harmless to mammals and to bacillus itself.

Choose the correct option.

Both(A)and(R)are True and(R)is the correct explanation of(A).
Both(A)and(R)are True but(R)is not the correct explanation of(A).
(A)is True but(R)is False.
(A)is False but(R)is True.

Q10. Consider the given two statements:

Assertion (A):	It is desirable that restriction enzymes that create sticky ends in resultant fragments are used to create rDNA.
Reason (R):	Creation of sticky ends facilitates the function of DNA polymerase.

Both(A)and(R)are True and(R)correctly explains(A)
Both(A)and(R)are True but(R)does not correctly explain(A)
(A)is True,(R)is False
(A)is False,(R)is True

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