In angiosperm, all the four microspores of a tetrad are covered by a layer that is formed by:
Correct answer: B. Callose
- A. Pectocellulose
- B. Callose
- C. Cellulose
- D. Sporopollenin
Explanation
Each microspore or pollen is having a two layered wall. Outer layer is thick tough cuticularised called exine, which is chiefly composed of a material called 'sporopollenin'. Inner layer is thin, delicate and smooth called intine, which is made of pectocellulose. Exine is not uniform but is thin at one or more places in the form of germ pores. Whereas intine made of pectocellulose covers the entire surface of pollen grains.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Reproduction
Human reproduction covers the male and female reproductive organs, gamete formation, fertilization, implantation and hormonal regulation. The menstrual cycle includes ovarian and uterine changes controlled by pituitary and ovarian hormones, while sexually transmitted diseases are studied through their causes, transmission, symptoms, prevention and effects on fertility.
Practise Reproduction
1,220 free Reproduction MCQs from Biology, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Biology questions like this
Biology is on 8 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Reproduction questions
In a flowering plant, archesporium gives rise to:
Anthesis is a phenomenon which refers to:
An ovule which becomes curved so that the nucellus and embryo sac lie at right angles to the funicle is:
What is the direction of the micropyle in the anatropous ovule?
Adventive embryony in Citrus is due to:
Anemophily type of pollination is found in: