Question

11.) which of the following is a function of the integument?

a.) attract pollinators

b.) protect against animal predation

c.) ensure double fertilization

d.) form a seed coat

12.) which one of the following statements about nitrogen and plant nutrition is FALSE?

a.)some plants are provided with nitrogen by nitrogen-fixing bacteria that live in nodules associated within the roots

b.) Nitrogen is a plant micronutrient, plants require very small quantities

c.) plant roots absorb nitrogen in the form of NH4+ and NO3-

d.) organic nitrogen from decomposing organic matter is a converted by ammonifying bacteria into a form of nitrogen that can be...

Answer 1

QUESTION 11.CORRECT ANSWER IS OPTION D.

INTEGUMENTS ARE PROTECTIVE LAYERS WHICH COVERS THE OVULE INSIDE WHICH THE EMBRYO IS PRESENT. GYMNOSPERMS HAVE ONLY ONE INTEGUMENT WHERE AS ANGIOSPERMS HAVE TWO INTEGUMENTS THE OUTER LAYER IS KNOWN AS SARCOTESTA AND INNER LAYER IS KNOWN AS SCLEROTESTA. SARCOTESTA ALSO PROVIDES ESSENTIAL NUTRIENTS REQUIRED FOR THE DEVELOPMENT OF THE EMBRYOSAC. AFTER THE EGG IS FERTILIZED THE INTEGUMENTS DEVELOP INTO SEED COAT.

FIRST OPTION IS WRONG BECAUSE INTEGUMENTS DONOT ATTRACT POLLINATORS . USUALLY THE COLOUR OF THE PETALS AND  THE NECTAR ATTRATCTS POLLINATORS.

OPTION B IS ALSO WRONG BECAUSE INTEGUMENTS DONOT PROTECT FROM ANIMAL PREDATORS. STRUCTURES LIKE THORNS CAN PROTECT A PLANT FROM ANIMAL PREDATION.

OPTION C IS ALSO WRONG INTGUMENTS DONOT HELP IN DOUBLE FERTILIZATION.

QUESTION 12.THE FALSE OPTION IS B .

NITROGEN IS A MACRONUTRIENT. PLANTS REQUIRE MACRONUTRIENTS IN LARGE QUANTITIES.

PLANTS REQUIRE MACRONUTRIENTS IN LARGE QUANTITIES AND MICRONUTIENTS IN SMALL QUANTITIES.MACRONUTRIENTS  PLAY A MAJOR ROLE IN THE GROWTH AND METABOLISM OF THE PLANT.MACRONUTRIENTS OF THE PLANTS ARE: CARBON , HYDROGEN, NITROGEN , OXYGEN, POTASSIUM , PHOSPHORUS, CALCIUM , SULFUR AND MAGNESIUM.

MICRONUTRIENTS REQUIRED BY THE PLANTS ARE:IRON , MANGANEESE, BORON , MOLYBDENUM, COPPER, ZINC, CHLORINE , NICKEL, COBALT SODIUM AND SILICON.

OPTION A IS CORRECT.LEGUMINOUS PLATS HAVE SPECIAL STRUCTURES IN THEIR ROOTS CALLED ROOT NODULES. COLONIES OF NITROGEN FIXING BACTERIA IS PRESENT INSIDE THE ROOT NODULES.IT IS A SYMBIOTIC ASSOCIATION. THEY FIX AND GIVE NITROGEN TO THE PLANT IN ABSORBABLE FORM.

OPTION C IS ALSO CORRECT PLANTS ABSORB NITROGEN IN THE FORM OF AMMONIUM IONS AND NITRATE IONS .

OPTION D IS NOT COMPLETE.