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

Assertion: Selaginella and salvinia are homosporus.
Reason: Ovules of gymosperms are enclosed withini 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 : Pollination and fertilization in flowers produces fruits and seeds. Reason : After fertilization the ovary becomes fruit and ovule becomes seed.

Assertion (A): Ovaries are both cytogenic and endocrine. Reason (R): Ovaries produce ovum and reproductive hormone.

Assertion (A) : Angiosperms have ovary in the flower. Reason (R) : They produce fruits and seeds.

Assertion: Infundibulum is a funnel shaped part closer to ovary. Reason: The edges of infundibulum helps in collection of the after ovulation.

Assertion (A): Menopause refers to the absence of menstruation during pregnancy. Reason (R): Ovulation occurs during menstrual phase.

Assertion (A) : IUD's are inserted inside the ovary. Reason (R ) : IUD's increases phagocytosis of sperms

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

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: Oral pills are used to prevent ovulation by inhibiting the secretion of FSH and LH hormones. Reason: It contains synthetic Gonad Stimulating Hormones.

Assertion : Pills are very effective contraceptives with few side effects Reason : Pills inhibit ovulation and implanation as well as retard entry of sperms.