Home
Class 11
BIOLOGY
Assertion: Selaginella and salvinia are ...

Assertion: Selaginella and salvinia are homosporus.
Reason: Ovules of gymosperms are enclosed within the ovaries.

A

If both assertion and reason are true and reason is the correct explanation of assertion.

B

if both assertion and reason are true but reason is not the correct explanation of assertion

C

if assertion is true but reason is false.

D

if both assertion and reason are false.

Text Solution

Verified by Experts

The correct Answer is:
D
In majority of the pteridophytes, all the spores are of similar kinds, such plants are called homosphorous. Genera like Selaginella and Salvinia Which two produce two kinds of spores i.e. macro (large) and micro (small) spores, are known as
Promotional Banner

Similar Questions

Explore conceptually related problems

Assertion : Mucus associated lymphoid tissues are specialised immune barrier located on skin. Reason : These lymphoid tissues are located within tonsils, adenoids and Peyer's patches.

Assertion: Spores in mosses are contained within the capsule. Reason: Spores are formed by mitotic division in mosses.

Assertion : the quasifluid nature of lipid enables lateral movement pof proteins within the overall bilayer. Reason : This ability to move within the membrane is called fluidity and is important for cell growth.

Assertion: ul(G) is the symbol for inferior ovary. Reason:Adhesion is indicated by enclosing the figure within bracket.

Assertion:The floral formula of Family Solanaceae is Reason:This floral formula of Solanaceae tells that flower is bisexual, sepals five, petals five, stamens five and gynoecium tricarpellary, trilocular with many ovules.

Assertion:The placentation in which the placenta forms a ridge along the ventral suture of ovary and ovules are borne on this ridge forming two rows is called parietal placentation. Reason:The marginal placentation has ovules developed on the inner wall of the ovary or on peripheral part.

Assertion:Fruit is the mature or ripened ovary developed after fertilisation. Reason:Fruit formed without fertilisation of the ovary is called parthenocarpic fruit.

Assertion: In gymnosperms, the male and female gametophytes do not have indepenent existance. Reason: They remain within the sporangia retained on the sporophyte.

Assertion : An angiospermous flower represents the modified condensed shoot which performs the function of sexual reproduction. Reason : The fertile leaves of the shoot become modified into microsporophylls and megasporophylls which bear ovules and anthers respectively.

Assertion : As long as the mother breast-feeds the child fully, chances of conception are almost nil Reason : Lactational amenorrhea method is based on the fact that ovulation does not occur during the period of intense lactation