NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions


 Protonema is the stage in the life cycle of

  • Cycas

  • Funaria

  • Selaginella

  • Mucor



Protonema is the juvenile stage of moss resulting from the germinating meiospore and consists of a slender, green, branching system of filaments. In Funaria, the protonema stage is only vegetative and transitory, which precedes the upright, leafy gametophyte.


Which of the following cell organelles stores hydrolytic enzymes?

  • Centriole

  • Lysosome

  • Chromoplast

  • Chloroplast



Lysosomes are the single membrane-bound cell organelles, which contain hydrolytic enzymes. These are also known as suicidal bags.


A monocarpic plant is one, which

  • has only one carpel

  • Flowers once in a life-time

  • Produces only one seed

  • Produces only one fruit


Flowers once in a life-time

On the basis of the frequency of flowering or fruiting in the lifetime, plants may be either monocarpic or polycarpic. Monocarpic plants are those, in which flowering and fruiting occur only once in their life, e.g., all annual and biennial plants and some perennial plants like bamboo and Agave. In contrast, polycarpic plants bear flowers and fruits repeatedly after attaining maturity, e.g., mango, Acacia, Eucalyptus, etc.


Which of the following tissues consist of living cells?

  • Vessels

  • Tracheids

  • Companion cell

  • Sclerenchyma


Companion cell

Companion cells are present between sieve tubes in the phloem of angiosperms. These are the living cells with large nucleus that controls the activity of non-nucleated sieve tubes.


Which of the following plant cells is not surrounded by a cell wall?

  • Root hair cell

  • Stem hair cell

  • Gamete cell

  • Bacterial cell


Gamete cell

The gamete is the haploid reproductive cell that fuses with another gamete to form a diploid zygote. These are not surrounded by the cell wall. On the other hand, root hair cell, stem hair cell and bacterial cell, all possess a well-defined cell wall.


Nucleotides are formed by

  • purine, sugar and phosphate

  • purine, pyrimidine and phosphate

  • purine, pyrimidine sugar and phosphate

  • pyrimidine, sugar and phosphate


purine, pyrimidine sugar and phosphate

The nucleotide is formed by the union of a phosphate group with a nucleoside. A nucleoside in fact contains a sugar molecule along with an organic nitrogenous base. Thus, a nucleotide contains an organic nitrogenous base (purine or pyrimidine) along with a sugar molecule and a phosphate group, Nucleoside = Sugars molecule + organic nitrogenous based on Nucleotide = Nucleoside + Phosphate group.


Which is a useful product of epidermal origin?

  • Saffron

  • Cotton Fibres

  • Clove

  • Jute


Cotton Fibres

Cotton is obtained from the epidermal hair present on the surface of seeds of Gossypium sp. These are made up of cellulose only and may be of two types, i.e., extractable lint and non-extractable fluffy fuzz. Cotton fibres are mainly used for textiles, celluloid, cellophane, rayon and paper pulp.


 Fern spores are usually

  • Haploid

  • Diploid

  • Triploid

  • Tetraploid



In pteridophytes, spore is a haploid structure, which develops after meiosis in the spore mother cell. On germination, it gives rise to a green haploid prothallus (gametophyte) which is monoecious, i.e., has both antheridia (male sex organs) and archegonia (female sex organs).


Calyptra develops from

  • Venter wall of archegonium

  • Outgrowth of gametophyte

  • Neck wall of archegonium

  • Paraphysis of the archegonial branch


Venter wall of archegonium

Calyptra is a covering developed from the ventre of archegonium in bryophytes and pteridophytes. It acts as a transpiration shield around the immature capsule and provides protection to the young capsule.


Which of the following cell organelles is associated with photorespiration?

  • Mitochondria

  • Peroxysome

  • Chloroplast

  • All of these



Photorespiration (C2-cycle) is a special type of respiration shown by many green plants (C3-plants) when they are exposed to light. It is a light-dependent process during, which O2 is used and CO2 is released. The process of photorespiration takes place only in chlorophyllous tissues of plants. Therefore, the main site for photorespiration is chloroplast. But mitochondria and peroxysomes are also required to complete the process.