Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

11.

Whorled, simple leaves with reticulate venation are present in

  • Calotropis

  • Neem

  • China rose

  • China rose


D.

China rose

If more than two leaves arise at a node of stem and its branches and form a whorl, the phyllotaxy is said to be whorled as in Alstonia Nerium etc. In Alstonia five leaves are present in a whorl while in Nerium three leaves are present in a whorl

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12.

Which one of the following structures in Pheretima is correctly matched with its function?

  • Clitellum - Secretes cocoo

  • Gizzard - Absorbs digested food

  • Setae - Defence against predators

  • Setae - Defence against predators


A.

Clitellum - Secretes cocoo

In earthworm, mature sperm and egg cells and nutritive fluid are deposited in cocoons secreted by the gland cells of clitellum.

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13.

Which one of the following correctly represents the normal adult human dental formula?

  • 3/3, 1/1, 3/2,/1/1

  • 2/2,1/1,3/2,3/3

  • 2/2, 1/1, 2/2, 3/3

  • 2/2, 1/1, 2/2, 3/3


C.

2/2, 1/1, 2/2, 3/3

The number of each type of tooth varies from one species to another and the conventional way of describing them is a 'dental formula'.The type of teeth are indicated by the first letter, and the number of teeth on one side of the upper jaw is indicated over the number of teeth on one side of the upper jaw is indicated over the number of the same type of teeth on the lower jaw. Because the formula is on one side of the mouth, the total number of teeth is the total in the formula x 2. The dental formula for a human adult is as follows:

1-2/2, C-1/1, Pm- 2/2, M -3/3 = 16  2 = 32 where, I incisors, C= canines, Pm - Premolar and M = Molars.


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14.

The unequivocal proof of DNA as the genetic material came from the studies on a 

I) The sporophyte in liverworts is more elaborate than that in mosses
II) Salvinia is heterosporous
III) The life -cycle in all seed - bearing plants is diplontic
IV) In pinus male and female cones are borne on different trees


  • Statements (I) and (III)

  • Statement (I) and (IV)

  • Statements (II) and (III)

  • Statements (II) and (III)


B.

Statement (I) and (IV)

The sporophyte is more developed in mosses rather than liverwort. The simplest sporophyte is found in Riccia, a liverwort, where it is represented by capsule only. The most complex sporophyte is found in funaria, a moss. However, the most advanced sporophyte is found in Anthoceros (a hornwort) due to the presence of intercalary meristem.

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15.

Consider the following four statements (I - IV)related to the common frog Rana tigrina, and select the correct option stating which ones are true (T) and which one are false (F).

I. On dry land it would die due to lack of O2 its mouth is forcibly kept closed for a few days.
II. It has four - chambered heart
III. On day land it turns uricotelic from ureotelic
IV. Its life -history is carried out in pond water.

  • I

    II

    III

    IV

    T

    F

    F

    T

  • I

    II

    III

    IV

    T

    T

    F

    F

  • I

    II

    III

    IV

    F

    F

    T

    T

  • I

    II

    III

    IV

    F

    F

    T

    T


A.

I

II

III

IV

T

F

F

T

Frogs respire on land and in the water by two different methods. In water, skin acts as an aquatic respiratory organ (cutaneous respiration). Dissolved O2 in the water is exchanged through the skin by diffusion. On land, the buccal cavity skin and lungs act as the respiratory organs. The respiration by lungs is called is called pulmonary respiration.

In frog, heart has three -chambers, two atria and one ventricle, and is covered by a membrane called pericardium

The frog excreates area and thus is a ureotelic animal. It never becomes uricotelic. In the frog, fertilisation is external and takes place in water.

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16.

Selaginella and Salvinia are considered to represent a significant step towards evolution of seed habit because

  • female  gametophyte is free and gets dispersed like seeds

  • female gametophyte lacks archegonia

  • megaspores possess endosperm and embryo surrounded by a seed coat

  • megaspores possess endosperm and embryo surrounded by a seed coat


D.

megaspores possess endosperm and embryo surrounded by a seed coat

Selaginella and Salvinia are heterosporous as they produce two kinds of spores - micro (small) spores and macro (large) spores. The microspores and megaspores germinate and give rise to male and female gametophyte in these plants and retained on the parent sporophytes for variable periods. The development of zygotes into young embryos takes place within the female gametophytes. This event is the precursor to the seed habit considered to an important step in evolution.

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17.

Bulk of carbon dioxide (CO2) released from body tissue into the blood is present as 

  • bicarbonate in blood plasma and RBCs

  • free CO2 in blood plasma

  • 70% carbamino - haemoglobin and 30% as bicarbonate

  • 70% carbamino - haemoglobin and 30% as bicarbonate


A.

bicarbonate in blood plasma and RBCs

70-75% of CO2 is transported as sodium bicarbonate (NaHCO3) by plasma, and as potassium bicarbonate (KHCO3) by RBCs.

350 Views

18.

In Kranz anatomy, the bundle sheath cells have

  • thin walls, many intercellular spaces and no chloroplasts

  • thick walls, no intercellular spaces and a large number of chloroplasts

  • thin walls, no intercellular spaces and several chloroplasts

  • thin walls, no intercellular spaces and several chloroplasts


B.

thick walls, no intercellular spaces and a large number of chloroplasts

C4 plants have a characteristic leaf anatomy called Kranz anatomy.Kranz means wreath (ring) and is a reflection of the arrangement of cells. The large sized bundle sheath cells may form several layers around the vascular bundles. These cells are characterised by having a large number of agranal chloroplasts, thick walls impervious to gaseous exchange and no intercellular spaces.

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19.

Which one of the following is not considered as a part of the endomembrane system? 

  • Golgi complex

  • Peroxisome

  • Vacuole

  • Vacuole


B.

Peroxisome

Cell organelles, whose functions are coordinated, are considered together as an endomembrane system. The endomembrane system includes endoplasmic reticulum (ER), Golgi complex, lysosomes and vacuoles. Since the functions of the mitochondria, chloroplast and peroxisomes are not coordinated with the above components, these are not considered as part of the endomembrane system.

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20.

Which one of the following is not an essential mineral elements for plants while the remaining three are?

  • Iron

  • Manganes

  • Cadmium

  • Cadmium


C.

Cadmium

Cadmium is not essential elements to plants

323 Views