MCQ
Xylem tissue is composed of
- AFour same kinds of elements
- BThree same kinds of elements
- ✓Four different kinds of elements
- DThree different kinds of elements
($i$) Tracheids Elongated or tube like cells with thick lignified walls and tapering ends. These are main water transporting elements
($ii$) Vessels A long cylindrical tube with lignified walls and large central cavity. It is a characteristic feature of angiosperms
($iii$) Xylem fibres have thickened walls and obliterated central lumen either septate or aseptate
($iv$) Xylem parenchyma is a thin cellulose and used to store food in the form of starch or fat
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$I.$ Water is essential for fertilisation
$II.$ Male gametophyte bears antheridia, while female gametophyte bears archegonium, which produces antherozoids and egg cell, respectively
$III.$ Antherozoids and egg cell fuses to give rise zygote. Zygote develops into young embryo. Embryo give rise to sporophyte
Which of the statements given above are correct?
$(a)$ Lecithin found in the plasma membrane is a glycolipid
$(b)$ Saturated fatty acids possess one or more $c = c$ bonds
$(c)$ Gingely oil has lower melting point, hence remains as oil in winter
$(d)$ Lipids are generally insoluble in water but soluble in some organic solvents
$(e)$ When fatty acid is esterified with glycerol, monoglycerides are formed
Choose the correct answer from the options given below:
$(i)$ The endomembrane system includes plasma membrane, ER, Golgi complex, lysosomes and vacuoles.
$(ii)$ ER helps in the transport of substances, synthesis of proteins, lipoproteins and glycogen.
$(iii)$ Ribosomes are involved in protein synthesis.
$(iv)$ Mitochondria help in oxidative phosphorylation and generation of $ATP$.