Subject

Biology

Class

NEET Class 12

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.

 Multiple Choice QuestionsMultiple Choice Questions

1.

What type of placentation is seen in sweet pea?

  • Basal

  • Axile

  • Free central

  • Marginal


D.

Marginal

In sweetpea (Pisum sativum), the placentation is marginal, in which the placenta develops along the junction of two carpels, in a unilocular ovary. In basal placentation, the ovules are few or reduced to one and are borne at the base of ovary. e.g. compositae.
In axile placentation, margins of carpels fold inwards, fusing together in centre of ovary to form a single central placenta. Ovary is divided into as my locules, as there are carples e.g., Hibiscus, Asphodelus. Free-central placentation possesses a placenta arises as a central upgrowth from ovary base e.g. Stellaria.

1417 Views

2.

Pentamerous, actinomorphic flowers, bicarpillary ovary with oblique septa, and fruit a capsule or berry, are characteristic features of

  • Asteraceae

  • Brassicaceae

  • Solanaceae

  • Liliaceae


C.

Solanaceae

Family Solanaceae possesses pentamerous, actinomorphic, hypogynous, hermaphrodite, complete flowers, bicarpellary, syncarpous, superior, bilocular ovary with axile placentation and oblique septa. The fruit is a berry or septicidal capsule.
In Asteraceae, ovary is bicarpellary, suncarpous, inferior, unilocular and fruit is cypsela.
In Brassicaceae, ovary is bicarpellary, syncarpous, superior, unilocular but later becomes bilocular due to false septum, fruit is siliqua or silicula.
In Liliaceae, flowers are usually trimerous, ovary is tricarpellary, syncarpous, superior, tricolour and fruit is fleshy berry or capsule.

1105 Views

3.

Which of the following statements regarding mitochondrial membrane is not correct?

  • The outer membrane is permeable to all kinds of molecules

  • The enzymes of the electron transfer chain are embedded in the outer membrane

  • The inner membrane is highly convoluted forming a series of infoldings

  • The outer membrane resembles a sieve


B.

The enzymes of the electron transfer chain are embedded in the outer membrane

In mitochondria, the enzymes of electron transport chain are found in the inner membrane while outer membrane contains enzymes involved in mitochondrial lipid synthesis and those enzymes that convert lipid substrates into forms that are subsequently metabolised in the matrix.
The outer membrane resembles a sieve that is permeable to all molecule of 10,000 daltons mole. weight or less including small proteins.
The inner membrane is impermeable and highly convoluted, forming a series of infoldings, known as cristate, in the matrix space.

957 Views

4.

The thalloid body of a slime mould (Myxomycetes) is known as

  • Autosomal

  • Cytoplasmic

  • Y-linked

  • X-linked


B.

Cytoplasmic

The members of Myxomycetes are called slime molds because they contain and secrete slime. They are included in lower fungi. Their somatic phase is a  multinucleate, diploid holocarpic Plasmodium (a product of syngamy).
In Plasmodium, propagation occurs through fission or thick walled cysts or sclerotium-like structures. Reproduction takes place by the formation of uninucleate, thick-walled resting spores which are produced within minute fruiting bodies like structures i.e., the sporangia, however, the true fruiting bodies are absent in slime molds.
Fruiting bodies and mycelium are absent in lower fungi Protonoma is not formed in fungi.

1291 Views

5.

Bowman's glands are found in

  • olfactory epithelium

  • external auditory canal

  • cortical nephrons only

  • juxtamedullary nephrons


A.

olfactory epithelium

Bowman's glands (olfactory glands) occur below the olfactory epithelia. Their ducts open on the olfactory epithelial surface. These glands secrete watery mucus to protect and keep the epithelium moist.

894 Views

6.

An organic substance bound to an enzyme and essential for its activity is called

  • coenzyme

  • holoenzyme

  • apoenzyme

  • isoenzyme


A.

coenzyme

Coenzyme is an organic nonprotein molecule that associates with an enzymes molecule in catalysing biochemical reactions. It usually participates in the substrate-enzyme interaction by donating or accepting certain chemical groups.
Apoenzyme is an inactive enzyme that must associate with a specific cofactor molecule in order to function.
Isoenzyme or isozyme is one of the several forms of an enzyme that catalyse the same reaction but differ from each other in such properties as substrate affinity and maximum rates of enzymes-substrate reaction.

852 Views

7.

How many ATP molecules could maximally be generated from one molecule of glucose, if the complete oxidation of one mole of glucose to CO2 and H2O yields 686 kcal and the useful chemical energy available in the high energy phosphate bond of one mole of ATP is 12 kcal?

  • Two

  • Thirty

  • Fifty seven

  • One


B.

Thirty

30 ATP molecules could be generated from 686 Kcal energy.

1197 Views

8.

Sulphur is an important nutrient for optimum growth and productivity in

  • pulse crops

  • cereals

  • fibre crops

  • oilseed crops


A.

pulse crops

Sulphur is constituent of certain amino acids. The amino acids form the protein by polymerisation. The pulses are rich in protein.

1110 Views

9.

A common structural feature of vessel elements and sieve tube elements is

  • thick secondary walls

  • pores on lateral walls

  • presence of P-protein

  • enucleate condition


B.

pores on lateral walls

The wall of both vessel and sieve tube elements are perforated by large opening. Due to this adaptation, the cell to cell contact is possible. The vessels are nucleated whereas the sieve tube elements are enucleated.

1345 Views

10.

Moss peat is used as a packing material for sending flowers and live plants to distant places because

  • it is easily available

  • it is hygroscopic

  • it reduces transpiration

  • it serves as a disinfectant


B.

it is hygroscopic

Sphagnum is a bryophyte, commonly called as bog moss or peat moss. It is hygroscopic and possesses a remarkable water holding capacity. Hence, it is used as a packing material in the transportation of flowers, live plants, tubers, bulbs, seedlings etc. It is also used in seedbeds and in moss-sticks.

5274 Views