write a short note sex organs in Nephrolepis.
Answers
Answer:
Reproduction in Nephrolepis:
Nephrolepis reproduces by two methods:
(i) Vegetative reproduction.
(ii) Sexual reproduction.
Vegetative reproduction:
It takes place by the formation of buds. Runner produces buds at some distance from parent rhizome. These buds give rise to fronds and thus help in vegetative reproduction of the plants
(ii) Sexual Reproduction:
Structure and Development of Sporangium:
Structure and development of sporangium is similar to Pteridium. Mature spores are brown in colour, with thin exosporium, thick endosporium with small warts.
Structure and Development of Prothallus:
Development of prothallus is similar to Pteridium. A mature prothallus is formed in about fifty days. It is large, green and heart shaped (Fig. 7) and 0.3 cm x 0.5 cm in diameter. It has a large cushion on the ventral side. It is 4 – 6 cells thick in the region of cushion and one celled elsewhere.
It has a deep notch and 4-7 meristematic cells lie in it. Prothallus is monoecious. At maturity antheridia are first to appear anteroposteriorly on the posterior side of the cushion. Development and structure of antheridium is similar to Pteridium.
A mature antheridium is large and spherical. At maturity it consists of 32 spermatocytes. Structure and development of the archegonium is similar to Pteridium. Many archegonia are formed and lie in the anterior part of the cushion at maturity. Fertilization and development of sporophyte is also similar to Pteridium.
Heart Shaped Prothallus
Answer:
Female sex organ in Nephrolepis is Archegonia
Male sex organ in Nephrolepis is Antheridium
Explanation:
Nephrolepis (Nephros, kidney; lepis, the indusium kidney-formed and scale like) is addressed by around 30 species. These species are circulated in the jungles of the whole world.
Around five species [N.cordifolia (Fish bornfern, Slender blade plant), N. exaltata (blade plant), N. volubilis, N. acuta and N. ramosa] are tracked down in India. Larger part of the species are earthbound however a couple of animal types e.g., N. ramosa are tracked down getting on the trees. N. cordifolia is found all through the Indian area upto 5000 feet height.
There are 2 types of reproduction in Nephrolepis:
(i) Vegetative reproduction.
It takes place by the formation of buds. Runner produces buds at far distance from parent rhizome. These buds give rise to fronds and thus help in vegetative reproduction of the plants.
(ii) Sexual reproduction.
An mature antheridium is huge and circular. At development it comprises of 32 spermatocytes. Construction and advancement of the archegonium is like Pteridium. Numerous archegonia are shaped and lie in the front piece of the pad at development. Preparation and advancement of sporophyte is additionally like Pteridium.
For more details check these:
brainly.in/question/45069356
brainly.in/question/45122318
#SPJ2