Home
Class 12
BIOLOGY
In gymnosperms, the ovules are not enclo...

In gymnosperms, the ovules are not enclosed by any ovary wall and remain exposed :
1 only before fertilisation
2 only after fertilisation
3 both before and after seed discharge
4 both before and after fertilisation.

A

only before fertilisation

B

only after fertilisation

C

both before and after seed discharge

D

both before and after fertilisation.

Text Solution

Verified by Experts

The correct Answer is:
D
Promotional Banner

Topper's Solved these Questions

  • PLANT KINGDOM

    VMC MODULES ENGLISH|Exercise ENABLE|49 Videos
  • PLANT KINGDOM

    VMC MODULES ENGLISH|Exercise EFFICIENT|47 Videos
  • ORGANISMS & POPULATIONS

    VMC MODULES ENGLISH|Exercise In - Chapter exercise C|10 Videos
  • PRINCIPLES OF INHERITANCE AND VARIATIO

    VMC MODULES ENGLISH|Exercise IMPECCABLE|56 Videos

Similar Questions

Explore conceptually related problems

Siphonogamous plant with exposed megasporangium before and after fertilisation are

Ovules grow into _________ and ovaries into after fertilisation.

In gymnosperms, the seeds that develop post-fertilisation, are naked. It means 1 not covered by any ovule wall 2 they are very small 3 they loose their wall at maturity 4 not covered by any ovary wall

Statement-1 : In an elastic collision in one dimension between two bodies, total momentum remains the same before, during and after the collision. Statement-2 : In an elastic collision in one dimension between two bodies, total kinetic energy remains the same before, during and after the collision.

On a smooth carrom board. A coin located at (4,6) is moving in negative y- direction with speed 3m//s is being hit at that point by a striker moving along negative x- axis . The line joining centre of the coin and striker just before the collision is parallel to x- axis. After collision the coin goes into the hole located at origin. Mass of the striker and the coin is equal. Considering the collision to be elastic, find the velocity ( in vector form ) of the stricker before the collision and after the collision.

A car moving with a velocity v_1 overtakes a person moving with a velocity v_2 . The ratio of frequencies of sound Just before and after overtaking, is:

Assertion: In gymnosperms the seeds that develop post fertilisation are naked. Reason: In gymnosperms ovules are not enclosed by any ovary wall.

The 22 students in a health class conducted an experiment in which they each recorded their pulse rates, in beats per minute, before and after completing a light exercise routine. The dot plots below display the results. Let s_1 and r_1 be the standard deviation and range, respectively, of the data before exercise, and let s_2 and r_2 be the standard deviation and range, respectively, of the data after exercise. Which of the following is true?

A ball of mass 3 kg is thrown upwards with velocity 20 m/s. After 1 s it explodes in 2 pieces one of mass 1 kg and other or 2 kg. After explosion both the pices maintain their vertical velocities but on ground they fall 90 m aport. Speed of both the pieces just after explosion are (both in m/s)

Echo can be heard only if the reflected sound reach our ears ………………... (after/ before) 0.1 s of the original sound.