MCQ
What is the function of germ pore?
- AEmergence of radicle
- BAbsorption of water for seed germination
- ✓Initiation of pollen tube
- DRelease of male gametes
✓
Answer
Correct option: C.
Initiation of pollen tube
c
(c) : In a pollen grain, exine is thin or absent at certain places. These areas may have thickened intine or deposition of callose. They are called germ pores (if rounded) or germinal furrows (if elongated). After pollination, the pollen grain on the stigma absorbs water and nutrients from the stigmatic secretion through its germ pores. The tube or vegetative cell enlarges and comes out of pollen grains through germ pore to form a pollen tube.
(c) : In a pollen grain, exine is thin or absent at certain places. These areas may have thickened intine or deposition of callose. They are called germ pores (if rounded) or germinal furrows (if elongated). After pollination, the pollen grain on the stigma absorbs water and nutrients from the stigmatic secretion through its germ pores. The tube or vegetative cell enlarges and comes out of pollen grains through germ pore to form a pollen tube.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
$A :$ $G_2$-phase is pre-mitotic phase.
$R :$ Chromosomes undergo condensation in this phase.
→$R :$ Chromosomes undergo condensation in this phase.
$A$ : Four $ATP$ molecules are produced directly during glycolysis.
$R$ : Substrate level phosphorylation occurs at two steps for a glucose broken down in mitochondrial matrix.
→$R$ : Substrate level phosphorylation occurs at two steps for a glucose broken down in mitochondrial matrix.
If forest area is reduced to half, which one of the following will be a long term effect
Identify the part $A$ and $B$ from the given figure :
→Statement I: The mycoplasma are organisms that completely lack a cell wall.
Statement II: They are the smallest living cells. known and cannot survive without oxygen.
Statement II: They are the smallest living cells. known and cannot survive without oxygen.
The impact of immigration on population density is
The electrons in the reaction centre of $PS-I$ are
→Match the following and choose the correct combination from the options given
→| Column $-I$ | Column $-II$ |
| $(A)$ Robert Hooke | $(1)$ Mutation theory |
| $(B)$ Charles Darwin | $(2)$ Swan-necked flask experiment |
| $(C)$ Hugo de vries | $(3)$ Origin of species |
| $(D)$ Louis pasteur | $(4)$ Micrographia |
Change in population size equation with prolonged exponential phase can be converted into logistic growth equation by multiplying it with
The transverse section of a plant shows following anatomical features:
→$(a)$ Large number of scattered vascular bundles surrounded by bundle sheath.
$(b)$ Large conspicuous parenchymatous ground tissue.
$(c)$ Vascular bundles conjoint and closed.
$(d)$ Phloem parenchyma absent. Identify the category of plant and its part