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Practice Online Test Series for JEE Main 2018 & NEET 2018
Diaphragms are contraceptive device used by the females. Choose the correct options from the statement given below:
a. They are introduced into the uterus
b. They are placed to cover the cervical region
c. They act as physical barrier for sperm entry
d. They mainly function as spermicidal agents
The megasporangium on maturation in Angiosperms give rise to:
What is the role of synergids of embryosac of Angiosperms?
Which of the following is used to deliver desirable gene into animal cell-
HGP in closely associated with the rapid development of a new area in biology, called as:
The cross over frequency between the genes A & B, A & C and B & C is 6%, 15% and 21& respectively. What is the possible sequence of genes on chromosome?
If a genetic disease is transferred from a phenotypically normal but carrier female to only some of the male progeny, the disease is:
The height of a plant is under control of polygenic inheritance. The plant having genotype aabb has 20 cm height and height of plant having genotype AaBb is 50 cm, what will be height of a plant having AABB genotype?
Read the following statement with respect to back cross?
How many statement are correct
Which of the following set represent convergent evolution?
Which of the following statement about morula in human is correct?
Cleistogamous flower in some Angiosperm prevents?
What is not true for RNA interference?
This segment of NDA has restriction sites I & II which create restriction fragments a, b and c. which of the following gel produced by electrophoresis would represent the separation and correct position of these fragments?
The expression of genes, for the production of milk in only female is:
The figure given below is the diagrammatic representation of the E.coli vector pBR322. Which one of the given options correctly identifies its certain components?
In a plant self incompatibility is controlled by three alleles `S_1, S_2 and S_3`. A male plant with genotype `S_1S_2` is crossed with another female plant with genotype `S_2S_3`. Which of the following type of progeny can not be obtained?
Match the following :-
Column-II
(a)
Preformation theory
(i)
K.F. Wolf
(b)
Theory of epigenesist
(ii)
C.Darwin
(c)
Pangenesis theory
(iii)
Swammerdam
(d)
Germplasm theory
(iv)
Weismann
Under certain condition, scientists have obtained cell like structure (without cellular organisation) called :-
