Home
Class 12
BIOLOGY
If the tip of the pollen tube enters int...

If the tip of the pollen tube enters into the embryo sac of the ovule through micropyle then it is called- (A) Chalazogamy (B) Porogamy (C) Mesogamy (D) Autogamy

A

Chalazogamy

B

Porogamy

C

Mesogamy

D

Autogamy

Text Solution

Verified by Experts

Promotional Banner

Topper's Solved these Questions

  • 2018- QUESTION PAPER

    UNITED BOOK HOUSE|Exercise EXERCISE |46 Videos

  • 2019- QUESTION PAPER

    UNITED BOOK HOUSE|Exercise EXERCISE |50 Videos

Similar Questions

Explore conceptually related problems

Pollen tube enters the embryo sac usually

In general, pollen tube enter the ovule through

At the time of entering embryo sac the pollen tube contains

Entry of pollen tube through micropyle while reaching the embryo sac is called

(a) Draw a diagrammatic sectional view of a mature anatropous ovule and label the following parts in it : (i) that develops into seed coat. (ii) that develops into an embryo after fertilization. (iii) that develops into an endosperm in an albuminous seed. (iv) through which the pollen tube gains entry into the embryo sac. (v) that attaches the ovule to the placenta. (b) Describe the characteristic features of wind pollinated flowers.

Identify the characters of plant where eight-nucleate embryo sac was first studied by Strasburger . (a) Micropyle , chalaza , and funiculus is same vertical line (b) Both unisexual and bisexual flowers on same plant ( c) Filiform apparatus conducts food from endosperm to egg apparatus (d) Long funiculus coils like watch spring around the ovule.

Go through the following statements (i) The cambium is generally more active on the inner side than on the outer. (ii) The autumn wood is darker and has a higher density than spring wood. (iii) In stem, the secondary xylem shows distinction into protoxylem and metaxylem and occurs in the from of patches. (iv) The tracheids and vessels of the sapwood get plugged by the ingrowth of the adjacent parenchyma cells into their cavities called tyloses. Which of theses are correct ? a. (i), (ii) & (iii) b. (i), (ii) & (iv) c. (i) and (ii) d. (i), (iii) & (iv)

Which ones are true and false ? (a)Positive hydrostatic pressure is called turgor pressure (b) Wall pressure exerts to prevent the increase of protoplasm size(c) Diffusion is more rapid in liquid than in gases (d) Diffusion of water through a semipermeable membrane is called imbibition (e) Osmosis is movement of substances which takes place along a diffusion gradient

Go through the following statements (i) Phloem parenchya is absent in most of the monocot (ii) Phloem fibres store food material and other substance like resins, latex and mucilage (iii) Phloem fibre are generally absent in the primary phloem but are found in the secndary phloem (iv) Gymnosperms lack sieve tubes and albuminous cells. Which of these are correct ? a. (i), (ii) and (iii) b. (ii), (iii) and (iv) c. (i) and (iii) d. (i), (iii) and (iv)