World's only instant tutoring platform
dropdown-logo
Get 2 FREE Instant-Explanations on Filo with code FILOAPP
Question
Medium
Timing Icon

Solving time: 3 mins

In an angiospermic plant, endosperm is formed due to fertilization of secondary nucleus but it is absent in some of the seeds viz. pea, bean, phaseolus (moong) etc. It is due to lack of

A
Certain enzymes

B
Dicotyledonous hormone

C
Growth hormone

D
None of the above

tutor 0tutor 1tutor 2
Found 7 tutors discussing this question
Discuss this question LIVE
7 mins ago

Text SolutionText solutionverified iconVerified

In almost all angiosperms, double fertilisation takes place where a triploid endosperm is formed. In a few cases, it is non - endospermous where the entire endosperm is consumed during the development of embryo.
Was this solution helpful?
112
Share
Report
One destination for complete JEE/NEET preparation
One destination to cover all your homework and assignment needs
Learn Practice Revision Succeed
Instant 1:1 help, 24x7
Instant 1:1 help, 24x7
60, 000+ Expert tutors
60, 000+ Expert tutors
Textbook solutions
Textbook solutions
Big idea maths, McGraw-Hill Education etc
Big idea maths, McGraw-Hill Education etc
Essay review
Essay review
Get expert feedback on your essay
Get expert feedback on your essay
Schedule classes
Schedule classes
High dosage tutoring from Dedicated 3 experts
High dosage tutoring from Dedicated 3 experts
Trusted by 4 million+ students

Practice more questions from Sexual Reproduction in Flowering Plants

Question 2
Hard
Views

Views: 5,319

Direction: Read the following and answer the questions from given below The ovule or the megasporangium develops as a small protuberance of the placental tissue. In the very young ovule, a single hypodermal cell is differentiated as the archesporium. This archesporium cell may or may not cut off some parietal cells and then becomes the Megaspore Mother Cell (MMC). The MMC undergoes division to form megaspore cells. Meanwhile two integuments develop from the base of the ovule. (i) Which of these cells is the largest cell of the ovule? (a) Antipodal cell (b) Central cell (c) Megaspore mother cell (d) The size of the cells varies from species to species and none of the given above can be treated as largest (ii) In angiosperms, microsporogenesis (a) involve meiosis (b) occur in ovule (c) occur in anther (d) form gametes without further divisions (iii) Megasporogenesis is the (a) formation of fruits (b) furmation of seeds (c) formation of megaspores (d) Both (b) and (c) (iv) Megaspore mother cell is found near the region of (a) micropyle (b) chalaza (c) nucellus (d) integuments (v) Assertion (A) Megaspore mother cell undergoes meiosis to produce four megaspores. Reason (R) Megaspore mother cell and megaspore both are haploid. (a) Both A and R are true and R is the correct explanation of (b) Both and are true, but is not the correct explanation of (c) is true, but is false (d) Both A and R are false
View more
filo Logo

Practice questions on similar concepts asked by Filo students

Question 1
Views

Views: 5,264

Texts: Case Study #3: Male Pituitary Adenoma Hoon-Ki is a 34-year-old man who visited a physician complaining of erectile dysfunction and sensitive growths on his breasts. The physician observed that Hoon-Ki appeared obese, and a test of his sperm count demonstrated oligospermia (low sperm count). Hoon-Ki said he had recovered from mumps a few years previously, and during that time had viral orchitis in one of his testicles. Further discussion revealed that Hoon-Ki was a heavy user of both marijuana and alcohol. Hoon-Ki did not have any chronic diseases and his musculature appeared normal. Examination revealed the presence of glandular masses in the breasts, indicating gynecomastia. The physician ordered blood tests for total testosterone, estradiol, LH, and prolactin, and asked that a karyotype be performed (observation of Hoon-Ki’s chromosomes) to test for Klinefelter’s syndrome. In the meantime, the physician strongly advised Hoon-Ki to cease using marijuana and alcohol. Hoon-Ki’s total plasma testosterone concentration was abnormally low, and his ratio of plasma estradiol to testosterone was abnormally high. Hoon-Ki’s plasma LH levels were low, and his prolactin levels were elevated. He did not have Klinefelter’s syndrome. The physician told Hoon-Ki that he could give him tamoxifen (a SERM that is an estrogen receptor antagonist in breast tissue) if his gynecomastia becomes painful, and said that he would give Hoon-Ki hCG injections for a time, then a preparation that also contains FSH activity, and then, once spermatogenesis was restored, he could be maintained on hCG. The physician also scheduled Hoon-Ki for an MRI, saying that he suspected that Hoon-Ki could have a pituitary adenoma. Questions (10 marks)
  1. How is Hoon-Ki’s obesity related to his high ratio of plasma estradiol to testosterone? (2 marks)
  2. How can chronic heavy use of marijuana and/or alcohol affect testosterone levels? (1 mark)
  3. What is Klinefelter’s syndrome, and how would it affect the male reproductive system? (2 marks)
  4. What findings from the clinical tests best explain Hoon-Ki’s gynecomastia? (1 mark)
  5. Given that Hoon-Ki’s plasma LH levels were low, what might that indicate about the cause of Hoon-Ki’s symptoms? (2 marks)
  6. How could hCG help alleviate Hoon-Ki’s low plasma testosterone levels and influence sperm production? (2 marks)
View more
Doubt Icon Doubt Icon

Stuck on the question or explanation?

Connect with our Biology tutors online and get step by step solution of this question.

231 students are taking LIVE classes
Question Text
In an angiospermic plant, endosperm is formed due to fertilization of secondary nucleus but it is absent in some of the seeds viz. pea, bean, phaseolus (moong) etc. It is due to lack of
TopicSexual Reproduction in Flowering Plants
SubjectBiology
ClassClass 12
Answer TypeText solution:1
Upvotes112