Dr. F. Went noted that if coleoptile tips were removed and placed on agar for one hour, the agar would produce a bending when placed on one side of freshly­cut coleoptile stumps. Of what significance is this experiment ?

The flowers are Zygomorphic in
\((a)\) Mustard \((b)\) Gulmohar \((c)\) Cassia \((d)\) Datura \((e)\) Chilly
Choose the correct answer from the options given below:

Identify the wrong statement with reference to immunity.

Select the incorrect statements with reference to Rh grouping :
A. Erythroblastosis foetalis is a condition observed having foetus with \(Rh ^{-v e}\) blood and mother with Rh \(+v e\) blood.
B. Rh antigen is observed on RBCs in the majority of human beings.
C. Before blood transfusion, Rh group should also be matched.
D. Rh incompatibility is observed when a pregnant mother is \(Rh ^{-v e}\) and the foetus is \(Rh ^{+v e}\).
E. Erythroblastosis foetalis can be avoided by administering anti-Rh antibodies to the mother immediately after the delivery of the second child.
Choose the answer from the options given below :

Carnivorous animals - lions and leopards, occupy the same niche but lions predate mostly larger animals and leopards take smaller ones. This mechanism of competition is referred to as

Select the correct statement:

Match List \(I\) with List \(II\) :Choose the correct answer from the options given below :

List \(I\)	List \(I\)
\(A\) Exophthalmic goiter	\(I\) Excess secretion of cortisol, moon face  hypergylcemia.
\(B\) Acromegaly	\(II\) Hypo-secretion of thyroid hormone and stunted growth.
\(C\) Cushing's syndrome	\(III\) Hyper secretion of thyroid hormone  protruding eye balls.
\(D\) Cretinism	\(IV\) Excessive secretion of growth hormone.

An inductor of inductance \(2\,mH\) is connected to a \(220\,V , 50\,Hz\) \(a.c.\) source. Let the inductive reactance in the circuit is \(X _1\). If a \(220\,V\) dc source replaces the ac source in the circuit, then the inductive reactance in the circuit is \(X _2 . X _1\) and \(X _2\) respectively are

The power of a biconvex lens is \(10\) dioptre and the radius of curvature of each surface is \(10 \;cm\). Then the refractive index of the material of the lens is,

Activation energy of any chemical reaction can be calculated if one knows the value of

\(MALT\) constitutes about _______ percent of the lymphoid tissue in human body.

Which chromosome in the human genome has the highest number of genes?

Match the following columns and select the correct option

Column \(I\)	Column \(II\)
(\(a\)) Ovary	(\(i\)) Human chorionic Gonadotropin
(\(b\)) Placenta	(\(ii\)) Estrogen and Progesterone
(\(c\)) Corpus Iuteum	(\(iii\)) Androgens
(\(d\))Leydig cells	(\(iv\))Progesterone only