sexual reproduction in plants

Question 1

long and slender stalk called the

Answer 1

filament

Question 2

___ is bilobed

Answer 2

anther

Question 3

layers of sporangium

Answer 3

epidermis
endothecium
middle layers
tapetum

Question 4

grp of petals

Answer 4

corolla

Question 5

grp of sepals

Answer 5

calyx

Question 6

grp of carpels

Answer 6

gynocieum

Question 7

grp of stamens

Answer 7

androcieum

Question 8

__ nourishes the pollen grains

Answer 8

tapetum

[binucleate]

Question 9

how r microspore tetrads formed

Answer 9

sporogenous tissues undergo meiotic divisions

Question 10

what is microsporogenesis

Answer 10

formation of microspores from pollen mother cells thru meiosis

Question 11

size of pollen grains

Answer 11

25-50 micrometres

Question 12

hard outer layer called ___ is made up of ___

Answer 12

exine

sporopollenin

Question 13

prominent appertures in exine where sporopollenin is absent

Answer 13

germ pores

Question 14

inner wall of pollen grain is called ___

Answer 14

intine

Question 15

when pollen grain is mature it contains 2 cells

Answer 15

vegetative cell- abundant food reserve and a large irregularly shaped nucleus
generative cell- spindle shaped with dense cytoplasm

Question 16

types of gynoecium

Answer 16

monocarpellary

multicarpellary

Question 17

ovule is attached to placenta by

Answer 17

funicle

Question 18

the region where the body of the ovule fuses with the funicle

Answer 18

hilum

Question 19

protective envelopes on ovule

Answer 19

integuments

Question 20

what represents the basal part of the ovule

Answer 20

chalaza

Question 21

what is megasporogenesis

Answer 21

process of formation of megaspores from the megaspore mother cell

Question 22

what is intine made up of

Answer 22

cellulose and pectin

Question 23

how many meiosis and mitosis does take place in the formation of an ovule

Answer 23

1 meiosis and 3 mitosis

Question 24

a typical angiosperm embryo sac is

Answer 24

8 nucleated and 7 celled

Question 25

what is autogamy

Answer 25

pollination achieved within the same flower

Question 26

what is geitonogamy

Answer 26

pollination between same plant but different flowers

eg: maize, castor

Question 27

what is xenogamy

Answer 27

pollination between different plants

eg: papaya

Question 28

what are chasmogamous flowers

Answer 28

exposed anther and stigma

Question 29

what are cleistogamous flowers

Answer 29

do not open at all

Question 30

examples of flowers that produce chasmogamous and cleistogamous flowers

Answer 30

commelina oxalis viola

Question 31

pollination through wind is called

Answer 31

anemophily

Question 32

pollination through water is called

Answer 32

hydrophily

Question 33

examples of water pollinated plants

Answer 33

vallisneria
hydrilla
zostera

Question 34

list outbreeding devices

Answer 34

receptivity (timing)- pollen release and stigma receptivity are not synchronised
position- stigma and anther are placed at different positions
self incompatibility
unisex flowers
dioecy

Question 35

coconut water is

Answer 35

free nuclear endosperm

Question 36

white kernel is

Answer 36

endosperm

Question 37

what is apomixis

Answer 37

formation of seed without fertilisation

Question 38

what is polyembrony

Answer 38

occurrence of more than one embryo in a seed