Plant Kingdom — BIOLOGY STD 11 Science — Question

$(a)$ The leaflets are modified into pointed hard thorns in Citrus and Bougainvillea

$(b)$ Axillary buds form slender and spirally coiled tendrils in cucumber and pumpkin

$(c)$ Stem is flattened and fleshy in Opuntia and modified to perform the function of leaves

$(d)$Rhizophora shows vertically upward growing roots that help to get oxygen for respiration

$(e)$ Subaerially growing stems in grasses and strawberry help in vegetative propagation

Choose the correct answer from the options given below:

$(i)$ Genus comprises a group of related species which has more characters in common in comparison to species of other genera.

$(ii)$ Three different genera such as Solanum, Datura and Petunia are placed in the family malvaceae.

$(iii)$ In case of plants, classes with a few similar characters are assigned to a higher category called phylum.

$I.$ Muscle fibre is lined by the plasma membrane called sarcolemma

$II.$ Cytoplasm of the muscle fibre is called tonoplasm

$III.$ Sarcolemma of the muscle fibre encloses the sarcoplasm

$IV.$ Muscle fibre is syncitium

Select the correct option

 $\begin{array}{|l|l|} \hline Column\,\,-I  & Column\,\,-II \\ \hline A.\,\,Plant\,\,growth\,\,promoters & 1.\,\,Auxin \\ \hline B.\,\,Plant\,\,growth\,\,inhibitor & 2.\,\,Gibberellin \\ \hline  & 3.\,\,Abscisic\,\,acid \\ \hline  & 4.\,\,Cytokinin \\ \hline \end{array}$

$A - B$