STD 11 - 3. Plant kingdom — NEET STD 11 Science — Question

Phenetic classification of organisms is based on

Statement I: Meiosis involves two sequential cycles of nuclear & cell division.
Statement II: Four haploid cells are formed at the end of meiosis I.

Which of the following hormone is weak organic acid having unsaturated ring structures and derived from amino acid?

Which of the following possess vascular tissues but lacks seeds?

Mark the given statements True (T) or False (F).
(i) In plants, tissues are classified into two main groups, namely, meristematic and permanent tissues based on whether the cells being formed are capable of dividing or not.
(ii) Growth in animals is largely restricted to specialized regions of active cell division called meristem.
(iii) During the formation of leaves and elongation of stem, some cells 'left behind' from shoot apical meristem, constitute the axillary bud.
(iv) The meristem which occurs between young tissues is known as intracalary meristem.
(v) The meristem that occurs in the immature regions of roots and shoots of many plants, particularly those that produce woody axis and appear later than primary meristem is called secondary or lateral meristem.
(vi) Fascicular vascular cambium, intrafascicular cambium and cork-cambium are examples of lateral meristems.
(vii) During the formation of the primary plant body, specific regions of the apical meristem produce dermal tissues, ground tissues and vascular tissues.
(viii) Permanent tissues having many different types of cells are called complex tissues.
(ix) The collenchymas occurs in layers below the epidermis in monocotyledonous plants.
(x) Sclerenchyma consists of long, narrow cells with thin and lignified cell walls having a few or numerous pits.
(xi) Sclerids are commonly found in the fruit walls of nuts; pulp of fruits like guava, pear and sapota; seed coats of legumes and leaves of tea.
(xii) Gymnosperms lack vessels in their xylem.
(xiii) The presence of vessels is a characteristic feature of phanerogams.
Choose the correct option given below :-

How many statements for artificial systems of classification are correct from given statements?
i. The classification used only gross superficial morphological characters.
ii. They were based mainly on vegetative characters or on the androecium structure.
iii. Not give equal weightage to vegetative and sexual characteristics.
iv. They separated the closely related species since they were based on a few characteristics.
v. They were based on habit, colour, number and shape of leaves etc.

In a moss, the sporophyte