Biology-1997

Q1. At what stage the embryo is implanted in the uterus of the mother in case of a test tube baby?
Ans1. 32-celled Morula.

Q2. Human heart is Myogenic yet a parasympathetic nerve can reduce the heart rate. Name the nerve.
Ans2. Vagus Nerve.

Q3. Which of the following diseases could be avoided by analysing the pedegree of parents – Klinefelter’s syndrome, Haemophilia, Amoebiasis.
Ans3. Haemophilia.

Q4. Name the functional contractile unit of the muscle.
Ans4. Sarcomere.

Q5. Name any two synthetic auxins used in agriculture.
Ans5. (i) NAA (naphthaleneacetic acid)

(ii) 2,4 D (2,4-dichlorophenoxyacetic acid)

Q6. What is pulvinus?
Ans6. Pulvinus is the swollen base of the leaf in many members of the bean family. It is responsible for sleep movements.

Q7. Name the fluid in which membranous labyrinth of the inner ear floats.
Ans7. Perilymph.

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