Q. 6. Perisperm differs from endosperm is that it is-
(A) haploid having reserve food
(B) polyploid having reserve food
(C) triploid having no reserve food
(D) diploid having no reserve food
Answer:
(D) diploid having no reserve food
Explanation:
Perisperm is the persistent remnant of the nucellus and is a diploid (2n) tissue, whereas the endosperm is typically a triploid (3n) tissue resulting from double fertilization. *(Note: While some perisperms do store food, diploidy is the primary biological differentiator highlighted in the options).*
Q. 7. Identify and name the two parts in a flower which are most important units of sexual reproduction?
The anther (producing male gametes/pollen) and the ovary (containing female gametes/ovules) are the essential functional units required for sexual reproduction in a flower.
Q. 8. Density of population tells us about –
(A) total number of individuals of a species
(B) total area occupied by a species
(C) number of individuals present per unit space in a given time
(D) population growth in a particular time span
Answer:
(C) number of individuals present per unit space in a given time
Explanation:
Population density is ecologically defined as the total number of individuals of a species present per unit area or volume at a specific given time.
Q. 9. Select the hormones produced in women only during pregnancy
A. Estrogen
B. Human chronic gonadotroph
C. Progesterone
D. Human placental lactogen
E. Relaxin
Choose the correct answer from the options given below:
(A) B and D only
(B) B and E only
(C) A, B and C only
(D) B, D and E only
Answer:
(D) B, D and E only
Explanation:
Human chorionic gonadotropin (hCG), human placental lactogen (hPL), and relaxin are hormones produced exclusively during pregnancy. Estrogen and progesterone are produced throughout the normal menstrual cycle as well.
Q. 10. Which of the following is not an example of terrestrial ecosystem?
(A) Wetland
(B) Grassland
(C) Forest
(D) Desert
Answer:
(A) Wetland
Explanation:
Wetlands are primarily aquatic or semi-aquatic ecosystems defined by water saturation, making them distinct from purely terrestrial ecosystems like forests, grasslands, and deserts.
