Home
Class 12
BIOLOGY
In Pinus, the approximate time for ferti...

In Pinus, the approximate time for fertilization after pollination is
(a) A four hours
(b) A few days
(c) A few weeks
(d) About a year

A

A four hours

B

A few days

C

A few weeks

D

About a year.

Text Solution

Verified by Experts

The correct Answer is:
D
Promotional Banner

Similar Questions

Explore conceptually related problems

The population of a country increases at a rate proportional to the number of inhabitants. f is the population which doubles in 30 years, then the population will triple in approximately. (a) 30 years (b) 45 years (c) 48 years (d) 54 years

The half-life of a radioactive substance is 20 min. The approximate time interval (t_2-t_1) between the time t_2 when 2/3 rd of its has decayed and time t_1 when 1/3 rd of it had decayed is - (A) 14 min (B) 20 min (C) 28 min (D) 7 min

When day light hours are increased, the rate of photosynthesis (a) Increases (b) Decreases (c) Remains unchanged (d) None of the above

Given below are assertion and reason point out if both true with reason being correct explantion (A) both are true but reason is not correct explanation (B) ,assertion is true but reason is wrong (c ) and both are wrong (D) Assertion :- Periodic abstinence is a natural method where couples abstain from coitus Reason:- coitus from days 5-10 should be avoided because this is the time of ovulation

Study the following: A. Testosterone influences the male secondary sexual characters B. Gestation period in rabbit is approximately 276 days C. Bulbo-uretheral glands secrete a vaginal lubricant D. Placenta secretes estrogen The correct answer is:

Consider the following four statements. Which of the following statements are incorrect ? (A) The sporophyte in liverworts is more elaborate than in mosses. ( B ) salvinia is heterozygous. C ) The life cycle in all seed - bearing plants is diplomatic. ( D ) In pinus male and female cones are borne on different trees.

Suppose we consider a large number of containers each containing initially 10000 atoms of radioactive material with a half-life of 1 year. After 1 year, (A) All containers will have 5000 atoms (B) All the containers will contain the same number of atoms but that number will only be approximately 5000. (C) The containers will in general have different numbers of the atoms but their average will be close to 5000. (D) None of the containers can have more than 5000 atoms.

In any nuclear reaction - (A) The total number of protons and neutrons remains same before and after the reaction. (B) Increase or decrease in the number of protons is equal to the decrease or increase in the number of neutrons. (C) Kinetic energy of the incident particle is approximately 8 MeV or its equivalent. (D) Some energy is released if total mass is reduced.

In genetic engineering, a DNA segment (gene) of interest, is translated to the host cell through a vector. Consider the following four agents (A-D) in this regard and select the correct option about which one or more of these can be used as a vector/vectors Statement (A) A bacterium (B) Plasmid (C) Plasmodium (D) Bacteriophage

Mass of an empty LPG cylinder is 14.8 kg annd when it is filled with n-butan gas, the mass is 29.0 kg annd internal pressure is 2.5 atm. After few days mass of the filled gas cylinder decreases to 23.2kg. Calculate the volume of gas used in m^(3) (at 27^(@)C & 1 atm).