NEET Botany Class 12 Questions

Which of the following polymer is stored in the liver of animals?

Sucrose (cane sugar) is a disaccharide. One molecule of sucrose on hydrolysis gives .........

Starch is composed of two polysaccharides which are

Egg apparatus of an embryo sac in angiosperms consists of

The three structural formulae A, B and C are given here identify them and select the correct option.

A nitrogenous base is linked to the pentose sugar through:

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

From evolutionary point of view, retention of the female gametophyte with developing young embryo on the parent sporophyte for some time, is first observed in

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

Majority of insect pollinated flowers are ?

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

Match the column :

Choose the correct set of bacterial disease

The process of formation of microspores:

In the given diagram, label the parts A, B, C, D, E.

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

Select the characteristics required in flowers for wind pollination and choose the correct option.

Match the Column-I with Column-II and choose the correct option.

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.

The backbone in a polynucleotide chain is formed due to

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?

Structural polysaccharide among following is

Select the incorrectly matched pair regarding placentation and the examples.

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

Endosperm is completely consumed by developing embryo in

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?

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

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.

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

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

Find out the incorrect statement from the following.

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;

Which of the following statements are incorrect for Natural selection? (i) Natural selection is based on certain observations which are factual. (ii) Populations are stable in size except for seasonal fluctuation, means that there had been competition for resources. (iii) Variation is the most fundamental evolutionary factor and all variations are inherited to the progeny. (iv) Variations which are heritable and which make resource utilisation better for few (adapted to habitat better) will enable only those to reproduce and leave more progeny. (v) Herbicides, pesticides etc., resistant organisms/cells are appearing in a time scale of months or years and not centuries. (vi) Appearance of herbicides, pesticides etc., resistant organisms/cells are examples of evolution by anthropogenic action.

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

Read carefully and find out the correct statement from the given (a) Twin characteristics of reproduction are increase in mass and number of individual (b) A multicellular organism grows by cell division (c) Cell division occurs in all tissues to replace lost cells (d) Taxonomical groups are morphological aggregates

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