Condoms are one of the most popular methods of contraception because of the following reasons:

Q. Identify the type of most popular contraceptive device whose features are given below:
(i) They do not interfere with the act of coitus.
(ii) These are effective barriers for insemination.
(iii) These help in reducing the risk of sexually transmitted diseases.

Q. Given below are statements about the harmful effects of weeds on crop plants.
(i) They interfere while harvesting.
(ii) They help crop plants grow healthily.
(iii) They compete with crop plants for water, nutrients, space, and light.
(iv) They affect plant growth.
Choose the correct statements from above.

Q. Diaphragms are contraceptive devices used by females. Choose the correct option from the statements given below:

i. They are introduced into the uterus

ii. They are placed to cover the cervical region

iii. They act as physical barriers for sperm entry

iv. They act as spermicidal agent

Q.

How many of the following statement(s) is/are correct regarding cytokinins?
I. They act in association with other growth regulators.
II. They are also known as the true cell division factor.
III. They do not have any effect on mitotic division.
IV. They are used in tissue culture experiments.

Q.

Read the words/phrases in the box. With your partner find their meaning in the dictionary.

Harsh conditions harmless survive intruder threatened predators prey continually

Fill in the blanks in the following passage with the above words/phrases.

All animals in forests and deserts struggle to ______________________in ______________

___________________ . Though most of the animals are ___________________, some are

dangerous when _____________________. If an ___________________ is noticed, they attack

or bite to save themselves. They struggle __________________ for food and water.

Some animals are called ______________because they __________________ on other animals.