Question

1. Write the scientific name of men and garden pea.
2. Where are genes located ?
3. No two individuals are absolutely alike in a population. Why ?
4. What are the chromosomes XY and XX known as ?
5. Name five varieties of vegetables which have been produced from ‘wild cabbage’ by the process of artificial selection.


SHORT
1. Differentiate between homologous and analogous organs, with examples.
2. What are fossils ? How can the age of fossils be determined ?

SHORT
1. Variation is beneficial to the species but not necessarily for the individual. Give three reasons to justify it.
2. The human hand, cat paw and horse foot, when studied in detail show the same structure of bones and point towards a common origin.
(a) What do you conclude from this ?
(b) What is the term given to such structures ?

LONG

1. Which one is the edible part in kale, kohlrabi, broccoli, cabbage and cauliflower ?
2. Name a recessive trait which is quiet common in human beings.

Answer 1

scientific name of men is homo sapiens
pea plant is pisum sativum
genes are located on chromosomes
xy and xx are called sex chromosomes
all the other answers u can found in ncert of science class 10

Answer 2

1. Man- Homo sapiens
2. Garden pea- Pisum sativum.
3. Because of variations in the chromosomes.
4. Sex chromosomes or allosomes.
5. Kale, Cauliflower, Broccoli, Cabbage, Kohlrabi.

1. Homologous organs are similar in structure but differ in their function whereas analogous structures are different in structure and perform the same function.
2.(a) They are homologous organs.
(b) Homologous structures.

1. In Kale, leafy portion is edible.
In Kohlrabi, fruit is edible
In broccoli, flower is edible.
In cabbage, leaves are edible.
In cauliflower, flower is edible.
2. O blood group in humans is recessive and is quite common.
Hope it helps you