Home
Class 12
BIOLOGY
Pollen grains are able to tolerate extre...

Pollen grains are able to tolerate extremes of temperature and desiccation as its exine is made of

A

Sporopollenin

B

Cellulose

C

Pectin

D

Callose

Text Solution

AI Generated Solution

Promotional Banner

Topper's Solved these Questions

  • TEST 5

    AAKASH INSTITUTE ENGLISH|Exercise EXAMPLE|625 Videos

  • TEST 4

    AAKASH INSTITUTE ENGLISH|Exercise TYPE |1 Videos

  • TEST 6

    AAKASH INSTITUTE ENGLISH|Exercise EXAMPLE|712 Videos

Similar Questions

Explore conceptually related problems

The exine of a pollen grain is composed of one of the most resistant biological matieral by which pollen grains are able to withstand extremes of temperature and dessication and cannot be degraded by any enzyme is

Pollen grains have spiny exine to aid in

Bacterical endospores are perennating structures which can tolerate extremes of high temperature due to the presence of :

Intine of pollen grain is made of

Assertion :- Pollen grains can withstand high temperature and strong acids and alkali. Reason-Their inner layer intine is made up of sporopollenin

Pollen grains can be stored for several years in liquid nitrogen having a temperature of

Pollen grains can be stored for several years in liquid nitrogen having a temperature of

Select the correct statements w.r.t pollen grain (a) Its sporoderm consists of exine and intine (b) Has exine whice helps in fossilization (c) Generally spherical shaped with about 25-50 um in diameter (d0 It can be stored in liquid N2 for years (e) Its viability does not depend on temperature and humidity.

Assertion : Exine of a pollen grain is made up of sporopollenin which is resistant to high temperature, strong acid or alkali as well as enzymatic degradation. Reason : Sporopollenin is absent in the region of germ pores.

The molecular theory states that the pressure exerted by a gas in closed vessel results from the gas molecules striking against the walls of the vessel. How will the pressure change if : the volume is made half of its original value keeping the temperature constant?