12th std botany lesson 1

Choose the correct statement from the following

• Gametes are involved in asexual reproduction

• Bacteria reproduce asexually by budding

• Conidia formation is a method of sexual reproduction

• Yeast reproduce by budding

An eminent Indian embryologist is

• S.R.kashyap

• P.maheshwari

• M.S.swaminathan

• K.C.mehta

Pollen tube was discovered by

• J.G.kolreuter

• G.B.amici

• E.strasburger

• E.hanning

Size of pollen grain in myosotis

• 10 micrometer

• 20 micrometer

• 200 micrometer

• 2000 micrometer

First cell of male gametophyte in angiosperm is

• Microspore

• Megaspore

• Nucleus

• Primary endosperm nucleus

Arrange the layers of another wall from locus to periphery

• Epidermis,middle layers,tapetum,endothecium

• Tapetum,middle layers, epidermis, endothecium

• Endothecium, epidermis, middle layers, tapetum

• Tapetum, middle layers, endothecium, epidermis

Identify the incorrect pair

• Sporopollenium- exine of pollen grains

• Tapetum- nutritive tissue for developing microspores

• Nucellus- nutritive tissue for developing embryo

• Obturator- directs the pollen tube into micropyle

Which of the following represent megagametophyte

• Ovule

• Embryo sac

• Nucellus

• Endosperm

In haplopappus gracilis, number of chromosomes in cells of nucleus is 4. What will be the chromosome number in primary endosperm cell?

• 8

• 12

• 6

• 2

Transmitting tissue is found in

• Micropylar region of ovule

• Pollen tube wall

• Stylar region of gynoceium

• Integument