In the figure of anatropous ovule given below, choose the correct option for the characteristic distribution of cells within the typical embryo sac
The coconut water from tender coconut is
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Pollen grains are well preserved as fossils because of presence of
Which of the following statements are true related to Seed X and Y ?
(i) Seed X is dicot and endospermic or albuminous.
(ii) Seed X is dicot and non-endospermic or non-albuminous.
(iii) Seed Y is monocot and endospermic or albuminous.
(iv) Seed Y is monocot and non-endospermic or non-albuminous.
Choose the correct option with the respect to the nature of the seed:
Which of the following statements are correct with respect to hormones secreted by placenta?
(i) Placenta secretes relaxin during later stage of pregnancy
(ii) Placenta secretes high amount of FSH during pregnancy
(iii) Placenta secretes relaxin during initial stage of pregnancy
(iv) Placenta secretes hCG and hPL during pregnancy
Figure A shows the front view of the human female reproductive system and Figure B shows the development of a fertilized human egg cell:
Figure A
Figure B
Identify the correct stage of development of human embryo (Figure B) that takes place at the site X, Y and Z respectively in the human female reproductive system (Figure A).
Choose the correct option from the table below:
Penetration of the sperm in the ovum is followed by:
The correct sequence of hormone secretion from beginning of menstruation is:
In the dioecious aquatic plant shown, identify the characteristics of the male flowers that reach the female flowers for pollination:
The thalamus contributes to the fruit formation in:
How many types of gametes would be produced if the genotype of a parent is AaBB ?
Which of the following statements indicates parallelism in genes and chromosomes ?
(i) They occur in pairs
(ii) They segregate during gamete formation
(iii) They show linkage
(iv) Independent pairs segregate independently
Which of the following amino acid substitution is responsible for causing sickle cell anemia ?
In human beings, where genotype AABBCC represents dark skin colour, aabbcc represents light skin colour and AaBbCc represents intermediate skin colour; the pattern of genetic inheritance can be termed as :
Which of the following combination of chromosome numbers represents the correct sex determination pattern in honey bees ?
Rajesh and Mahesh have defective haemoglobin due to genetic disorders. Rajesh has too few globin molecules while Mahesh has incorrectly functioning globin molecules. Identify the disorder they are suffering from:
Which of the following criteria must a molecule fulfil to act as a genetic material ?
(i) It should not be able to generate its replica.
(ii) It should chemically and structurally be stable.
(iii) It should not allow slow mutation.
(iv) It should be able to express itself in the form of Mendelian Characters.
The promoter site and the terminator site for transcription are located at :
Which of the following is correct about mature RNA in eukaryotes ?
In E.coli, the lac operon gets switched on when :
Oswald Avery, Colin MacLeod and Maclyn McCarty used enzymes to purify biochemicals such as proteins, DNA and RNA from the heat-killed S cells to see which ones could transform live R cells into S cells in Griffith's experiment. They observed that
AUG on the mRNA will result in the activation of which of the following RNA having correct combination of amino acids:
Short stretches of DNA used to identify complementary sequence in a sample are called
The structure of bilobed anther consists of
Direction: Consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below:
Assertion (A) : Chargaff rule is applicable to RNA.
Reason (R) : RNA contains deoxyribose sugar in them.
Direction: Consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below:
Assertion (A) : The mammary glands secrete milk for the nourishment of the young.
Reason (R) : These are modified sweat glands.
Direction: Consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below:
Assertion (A) : The primary sex organs are the structures that produce gametes.
Reason (R) : The primary sex organs located within the pelvic cavity and the secondary sex organs are the external genitalia.
Direction: Consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below:
Assertion (A) : Aminoacylation is an essential step for the synthesis of protein.
Reason (R) : It is the process of adding an activated amino acid to the acceptor arm of a transfer RNA.
If the haploid number of chromosomes in a plant species is 20, how many chromosomes will be present in the cells of the shoot tip?
A criminal blew himself up in a local market when he was chased by cops. His face was beyond recognition. Suggest a modern technique that can help establish his identity.
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