[A] the stems are unbranched
[B] the pinnately compound leaves persist for years
[C] have symbiotic association with n2 fixing cynobacteria
[D] all are correct
Which of the followings are correct for conifers?
I. Needle like leaves to reduce surface area.
II. Thick cuticle on leaves.
III. Sunken stomata to reduce water loss.
IV. The main plant body is gametophyte.
[A] II and III
[B] IV only
[C] I only
[D] II, I and III
Which of the following are correct for gymnosperms?
I. They are heterosporous.
II. They are the first vascular plants.
III. Posses fruits.
IV. Require water for fertilization.
[B] I and II
[C] II and III
[D] I, II, III and IV
Which of the following sequence is correct?
[A] Strobili-Sporophylls—> Sporangia—>Spores
Male gametophyte which is highly reduced and confined to only limited numbers of cells is called
[C] pollen grain
Male and female cones are formed on the same tree of
[A] pollen grains germinate inside the ovary
[B] the development of pollen grain takes place within the microsporangia
[C] the cones barring megasporophylls are called male cones or male strobili
[D] all are correct
Megaspore mother cell
[A] develops from one of the cell of nucleus
[B] forms four megaspore after meiosis
[C] formed in the megasporangium
The female gametophyte of gymnosperms
[A] bear two archegonia
[B] retained within megasporangium
[C] is unicellular
[D] both (a) and (b)
In gymnosperms, male and female gametophyte
I. do not have independent free living existence.
II. remain within the sporangia retained on parent sporophyte.
III. may be born on same or different tree.
IV. perform meiosis to produce gametes,
[A] l and II
[B] II and III
[C] III and IV
Pollination in gymnosperms take place by
[C] only physical factors like wind and water
[D] all of the above
[A] vascular plants with naked seeds
[B] vascular plants with covered seeds
[C] few vascular plants with naked seeds
[D] few vascular plants with covered seeds
Microscopic angiosperm is
[D] never microscopic
[A] massive woody trees
[B] shrubs and herbs
[C] ranges from tiny microscopic plants to tall trees
Height of eucalyptus tree is approximately