NEET Botany Class 12 Questions

Egg apparatus of an embryo sac in angiosperms consists of

In angiosperm, the haploid, diploid and triploid structures of a fertilised embryo sac sequentially are;

Majority of insect pollinated flowers are ?

Large holes in 'Swiss cheese' are due to production of large amount of CO₂ by bacterium

Select the incorrect pair w.r.t. Lac operon.

In the animal-pollinated flowers, _____ is/are the usual floral rewards.

Select the condition which helps in increasing the rate of decomposition of detritus.

The extinction of ecologically unique assemblage of cichlid fish in the Victoria Lake is due to

Match the column :

The process of formation of microspores:

Which of the following is a free-living biocontrol microbial agent for plant pathogen?

The backbone in a polynucleotide chain is formed due to

Consider the following statements.

(A) Pollen grains are well-preserved as fossils because of the presence of sporopollenin.

(B) Intine in pollen grain is a thin and continuous layer made up of cellulose and pectin.

Choose the correct option.

In RNA, every nucleotide residue has an additional -OH group at which of the following position

Which one of the following is a haploid structure?

In grasses which type of pollination is quite common?

In angiosperms, microsporogenesis, and mega sporogenesis:

When pollen grains of flower are transferred to stigma of another flower on a different plant, the process is called

How many of the following are the important steps in the process of decomposition? Humification, Anabolism, Fragmentation, Leaching, Mineralisation

Which one statement regarding "Okazaki fragment" is correct:

With regard to mature mRNA in eukaryotes:

In Hershey – Chase experiment, the virus which had radioactive DNA had

Plant embryo develops from

Genetic code consists of

The core of nucleosome is made up of two units each of

If both male and female flowers are present on the same plant such as castor and maize (monoecious), it prevents;

For conducting artificial hybridization, if the mother plant produces unisexual flowers

Which enzyme caused no transformation in Avery, MacLeod and McCarty's experiment?

Assertion (A): Cleistogamous flowers are invariably autogamous.

Reason (R): Cleistogamous flowers do not open at all and the anthers and the stigma lie close to each other.

Which one of the following pairs of nitrogenous bases of nucleic acids, is WRONGLY matched with the category mentioned against it?

The following ratio is always unity, according to chargaff rule?

Find out the incorrect statement from the following.

Which of the following is NOT a part of a transcription unit in DNA?

Assertion (A): The transcription and translation can be coupled in bacteria.

Reason (R): In bacteria, the mRNA does not require any processing to become active, and also both transcription and translation take place in cytoplasm.

All of the following are synthesised by RNA polymerase I in eukaryotes, except;

Identify the organisms that are found in hot springs.

The mRNA sequence generated from the coding strand with the sequence given below will be; 5’ ATGTGTGACTGATGAC 3’

The experimental proof for semi-conservative replication of DNA in chromosomes by Taylor et. al. was shown in

In some cereals like rice and wheat, pollen grains remain viable for __ P __ but in some members of Rosaceae, Leguminosae and Solanaceae, pollen viability is maintained for several __ Q __. P and Q respectively are

How many meiotic division would be required to produced 100 male gametophyte in angiosperms

Assertion: Exine of a pollen grain is made up of sporopollenin which is resistant to high temperatures, strong acids or alkali as well as enzymatic degradation. Reason: Sporopollenin is absent in the region of germ pores.

Which of the following statement is incorrect?

Given below are two statements :

Statement-I: The release of sperms into the seminiferous tubules is called spermiation.

Statement-II: Spermiogenesis is the process of formation of sperms from spermatogonia. In the light of the above statements, choose the most appropriate answer from the options given below:

In embryosac, three cells are grouped together at the micropylar end to constitute

The synergies have special cellular thickening at the micropylar tip, called

The given diagram shows microsporangium of a mature anther. Identify A, B and C.

What is the contribution of India in global species diversity -

Which of the following is not a monoecious plant

Greater biological diversity of tropics than temperate region is due to the :

Consider the following statements:

(a) Methyl guanosine triphosphate is added to 5' end of hnRNA.

(b) A segment of DNA coding for polypeptide is Intron.

(c) rRNA provides template for synthesis of proteins.

(d) RNA polymerase I transcribes rRNA

(e) Rho factor binds to RNA polymerase to terminate transcription.