NEET Botany 4

Question 1

Which of the following is a nitrogen-fixing non-leguminous plant?

Accepted Answer

Cycas

Answer

Cycas has coralloid roots that harbor Anabaena (a cyanobacterium) which fixes atmospheric nitrogen, making it a nitrogen-fixing non-leguminous plant.

Question 2

In angiosperms, the endosperm is:

Accepted Answer

Triploid (3n)

Answer

Endosperm in angiosperms is triploid (3n), formed by the fusion of the second male gamete with the two polar nuclei during double fertilization.

Question 3

The opening of stomata is triggered by:

Accepted Answer

Accumulation of K+ ions in guard cells

Answer

K+ ions accumulate in guard cells in response to light, increasing osmotic pressure and turgor, which causes the stomata to open.

Question 4

Which of the following is characteristic of a zygomorphic flower?

Accepted Answer

Bilateral symmetry

Answer

A zygomorphic flower has bilateral symmetry and can be divided into two equal halves by only one plane, as seen in pea and bean flowers.

Question 5

Which of the following correctly describes a ligule in grasses?

Accepted Answer

A small membranous outgrowth at the leaf-sheath junction

Answer

A ligule is a thin, membranous or hairy outgrowth found at the junction of the leaf blade and leaf sheath in grasses.

NEET - National Eligibility cum Entrance Test Practice Test