What is true about vein ?

• All veins carry deoxygenated blood

• All veins carry oxygenated blood

• They carry blood from organs towards heart

• They carry blood from heart towards organs

Grafting is not possible in monocots because they

• lack cambium

• have scattered vascular bundles

• have parallel venation

• are herbaceous

Acromegaly is due to hypersecretion of

• thyroxin

• prolactin

• insulin

• growth hormone

In synapsis two homologous chromosomes are connected at

• centromeres

• chromomeres

• telomeres

• none of these

The synthetic hormone used as a weedicide is

• Indole 3-acetic acid

• gibberellic acid

• 2, 4- D 

• Indole butyric acid

Which is present in monocot flowers?

• Sepals

• Petals

• Tepals

• None of these

RQ for fatty substance/ fat is

• unity

• less than one

• more than one

• zero

Fermentation products of yeast are

• H₂O + CO₂

• Methyl alcohol + CO₂

• Methyl alcohol + water

• Ethyl alcohol + CO₂

A group of plants or animals with similar traits of any rank is

• species

• genus

• order

• taxon

Stages in proper sequence of prophase- I are

• zygotene, leptotene, pachytene, diakinesis

• leptotene, zygotene, pachytene, diplotene and diakinesis

• eptotene, pachytene, zygotene, diakinesis and diplotene

• diplotene, diakinesis, pachytene, zygotene and leptotene