Plants need sunlight, carbon dioxide, and water in order to survive. These materials are needed during photosynthesis in order to produce oxygen and glucose.

E. I, II, and III

Gymnosperms produce through seeds and not by spores. Conifers produce seed in cones and once the seed is blown to another cone, fertilization will take place. During mitosis, gametes or haploid cells fuse together to grow a new diploid cell called sporophyte. In this case, cones are represented by the gametophytes stage.

B. II only

If a plant has parallel veins, it is considered a monocot plant.

C. Parallel veins

Gymnosperms are known to bear a cone that helps in the reproduction of such plant.

B. cone

In seed plants, the male gametophyte are hidden in the pollen grain. The role of a male gametophyte is to produce and deliver the sperm cells needed for fertilization.

B. pollen grain

Gymnosperm is a cone bearing plant.
The reproductive structures of gymnosperms are formed inside the cones. Gymnosperms produce male and female cones in separate plant. The name, cone is given as it resembles the shape of a geometric cone. The development of male and female gametophytes takes place in these cones. The cones are placed on the tip of male and female plants.

Hence, the correct option is (A) Gymnosperms.

A

In seed plants, the embryonic leaf that is found in a seedling is called a cotyledon.

D. cotyledon

The plant ovary develops into fruit after fertilization.
Flowers are the unique reproductive organs of angiosperms. Flowers contain ovaries. After the completion of two processes namely pollination and fertilization, the ovary develops into fruit. The ovary wall develops into fruit wall and the ovules develop into seeds. As the ovary protects the seeds, angiosperms are called enclosed seed bearing plants.

Hence, the correct option is (C) Fruit.

C

In the experiment, the students changed the temperature of the beaker by using heat and ice. Therefore, the independent variable is the temperature.

B. temperature

The variables which the students have held constant are plant type and light intensity.
The group of students used spring conifer plant in the experiment. The same plant type was used throughout the experiment. They did not change the plant in between. Therefore the type of the plant used is constant. Also, the students did not vary the intensity of light throughout the experiment. Hence, light intensity is also constant in the experiment. Both, plant type and light intensity were held constant throughout the experiment.

Hence, the correct option is (C) I and III only.

C

According to the experiment, the plant produced the greatest amount of bubbles at 30 degrees Celsius. The presence of bubbles indicates that a photosynthesis has taken place. When the temperature went below and above 30 degrees Celsius, the number of bubbles has reduced. This indicates that the rate of photosynthesis has actually decreased. Therefore, the photosynthesis in the conifer works best at 30 degrees Celsius.

B. II only